Harmonic Producing Or Selecting Network Patents (Class 331/76)
  • Patent number: 9088243
    Abstract: The embodiments herein relate to a magnetic field feedback based spintronic microwave oscillator driven by DC current. The microwave oscillator works based on a magnetic tunnel junction structure connected to a feedback waveguide. Any fluctuation in the magnetization direction of free magnetization layer of MTJ drives an oscillating current through the feedback waveguide which in turn exerts an oscillating magnetic field on the free layer and amplifies the magnetization fluctuations. If the DC current passing through the MTJ is more than a critical value, continuous processing states of the magnetization are possible. The critical current is independent of the thickness and magnetization of the free layer. A MTJ can be driven into spontaneous oscillations with DC current and magnetic field feedback circuit and can act as a spintronic microwave oscillator.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: July 21, 2015
    Inventors: Ashwin Tulapurkar, Chakkalakal Tomy, Yoshishige Suzuki, Dinesh Kumar, Katsunori Konishi
  • Patent number: 8754682
    Abstract: A fractional rate LC VCO and compensating divider circuit to avoid bit-rate interference includes an LC PLL having an input for receiving a reference clock signal, an N-stage ring VCO with rotating injection having an input coupled to an output of the LC PLL and an output for providing an output clock signal, a first divider circuit having an input coupled to an output of the N-stage ring VCO and an output coupled to the LC PLL, a second divider circuit having an input coupled to the output of the LC PLL, and an M-stage reference ring PLL having an input coupled to an output of the second divider and an output coupled to the N-stage ring VCO.
    Type: Grant
    Filed: April 18, 2012
    Date of Patent: June 17, 2014
    Assignee: STMicroelectronics (Canada) Inc.
    Inventors: Anton Pelteshki, Pat Hogeboom-Nivera
  • Patent number: 8638175
    Abstract: A circuit including a first oscillator configured to oscillate at a first frequency; a second oscillator configured to oscillate at a second frequency, the second frequency being different from and one of a harmonic or sub-harmonic of the first frequency; and a coupling between the first oscillator and the second oscillator configured to injection lock at least one of the first oscillator and second oscillator to the other of the first oscillator and second oscillator.
    Type: Grant
    Filed: July 6, 2011
    Date of Patent: January 28, 2014
    Assignee: STMicroelectronics International N.V.
    Inventor: Prashant Dubey
  • Patent number: 8570108
    Abstract: An injection-locked oscillator circuit includes a master oscillator, a slave oscillator, and an injection lock control circuit. The slave oscillator is decoupled from the master oscillator (for example, due to an unlock condition). When the slave is free running, its oscillating frequency is adjusted (for example, as a function of a supply voltage). After an amount of time, the slave is to be relocked to the master (for example, due the unlock condition no longer being present). The slave oscillating frequency is made to be slightly lower than the master oscillating frequency. The slave is then only recoupled to the master upon detection of an opposite-phase condition between the master oscillator output signal and the slave oscillator output signal. By only recoupling the slave to the master during opposite-phase conditions, frequency overshoots in the slave oscillating frequency are avoided that may otherwise occur were the recoupling done during in-phase conditions.
    Type: Grant
    Filed: August 5, 2011
    Date of Patent: October 29, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: Ashwin Ragunathan, Marzio Pedrali-Noy, Sameer Wadhwa
  • Patent number: 8456246
    Abstract: A quadrature VCO includes a first oscillator unit and a second oscillator unit. Each of the first and second oscillator unit is composed of a DC bias source, a complementary cross-coupled pair, an LC resonator unit, a frequency-doubling sub-harmonic coupler unit, and a ground terminal. When the LC resonator units of the first and second oscillator units are operated, four signals of different phases can be outputted via the output terminals. In this way, the output phase difference of the two oscillator units can keep 180 degrees and allow the two oscillator units to mutually inject signals to generate quadrature output signals.
    Type: Grant
    Filed: June 3, 2011
    Date of Patent: June 4, 2013
    Assignee: National Chung Cheng University
    Inventors: Shuenn-Yuh Lee, Liang-Hung Wang, Yu-Heng Lin
  • Patent number: 8294528
    Abstract: A VCO includes a transformer-based resonator that has a first LC tank and a second LC tank. The resonator has an even resonant mode and an odd resonant mode. The VCO further includes an active transconductance network that is coupled to a two-terminal port of the first tank and is also coupled to a two-terminal port of the second tank. A first terminal of the port of the first tank is capacitively coupled to a first terminal of the port of the second tank. A second terminal of the port of the first tank is capacitively coupled to a second terminal of the port of the second tank. The active transconductance network causes the resonator to resonate in a selectable one of the even and odd resonant modes depending on a digital control signal. The VCO is fine tuned by changing the capacitances of capacitors of the tanks.
    Type: Grant
    Filed: December 28, 2010
    Date of Patent: October 23, 2012
    Assignee: Qualcomm Incorporated
    Inventors: Guansheng Li, Li Liu, Yiwu Tang
  • Patent number: 8031014
    Abstract: A nonlinear solid-state device useful for frequency conversion of electromagnetic radiation and in particular for harmonic generation, comprising a waveguiding electromagnetically distributed structure (WEDS) which includes monolithically a synthetic nonlinear material (SNM). Input radiation coupled into the WEDS is converted into a higher frequency output radiation through a constricted oscillatory motion of charge carriers and phase matched harmonic frequency generation of radiation which builds up coherently over an interaction length many time larger than the radiation wavelengths. In one embodiment, microwave radiation is converted into terahertz radiation. In other embodiments, SNM based WEDS devices are adapted for frequency mixing and parametric oscillation.
    Type: Grant
    Filed: September 23, 2009
    Date of Patent: October 4, 2011
    Inventors: Avraham Gover, Menachem Nathan, Yotam Schatzberg
  • Patent number: 8010075
    Abstract: A high-order harmonics generator includes a plurality of high-pass filters to block out DC signals. In one embodiment, high-pass filters are coupled to the output signals from an envelope detector and a power detector. A high-pass filter can also be coupled to the output of a multiplier that multiplies the filtered envelope signal and the filtered power signal. Additional multipliers may also be used at outputs of multipliers in a cascaded chain of multipliers for higher harmonics generation.
    Type: Grant
    Filed: February 26, 2008
    Date of Patent: August 30, 2011
    Assignee: Scintera Networks, Inc.
    Inventor: Frederic Roger
  • Patent number: 7961058
    Abstract: A locking range enhancement technique is described that steers away part of the DC current and reuses it to generate more injected AC current to the injection-locked resonator-based frequency dividers (ILFDs). The injection-enhanced ILFDs maintain the key features of ILFDs, which are high speed and low power consumption, without requiring any extra inductive component and thus extra chip area.
    Type: Grant
    Filed: May 29, 2009
    Date of Patent: June 14, 2011
    Assignee: The Hong Kong University of Science and Technology
    Inventors: Howard Cam Luong, Sujiang Rong
  • Patent number: 7756487
    Abstract: A novel and useful apparatus for and method of local oscillator (LO) generation with non-integer multiplication ratio between the local oscillator and RF frequencies. The LO generation schemes presented are operative to generate I and Q square waves at a designated frequency while avoiding the well known issue of harmonic pulling. The input signal is fed to a synthesizer timed to a rational multiplier of the RF frequency L/N fRF. The clock signal generated is divided by a factor Q to form 2Q phases of the clock at a frequency of L(N*Q)fRF, wherein each phase undergoes division by L. The phase signals are input to a pulse generator which outputs a plurality of pulses. The pulses are input to a selector which selects which signal to output at any point in time. By controlling the selector, the output clock is generated as a TDM based signal. Any spurs are removed by an optional filter.
    Type: Grant
    Filed: August 24, 2007
    Date of Patent: July 13, 2010
    Assignee: Texas Instruments Incorporated
    Inventors: Gregory Lerner, Nir Tal, Robert B. Staszewski
  • Patent number: 7643889
    Abstract: A circuit for outputting temperature data of a semiconductor memory apparatus includes a temperature detecting circuit that generates a temperature voltage corresponding to a change in temperature and outputs the temperature voltage, an A/D converter that converts the temperature voltage into a first temperature code and outputs it, and a temperature data correcting unit that outputs a second temperature code obtained by correcting an error of the first temperature code using a correction code.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: January 5, 2010
    Assignee: Hynix Semiconductor Inc.
    Inventors: Chun-Seok Jeong, Kang-Seol Lee
  • Patent number: 7629857
    Abstract: A second harmonic oscillator has a series positive feedback configuration, suppresses output of a fundamental signal, and outputs a second harmonic signal having a frequency in a range from 1 GHz to 200 GHz generated inside of a circuit. The second harmonic oscillator includes: a transistor having a base terminal, a first emitter terminal, a second emitter terminal, and a collector terminal; a resonator circuit connected to the base terminal; a first transmission line shod-circuiting stub connected to one of the two emitter terminals; and a second transmission line short-circuiting stub connected to the other of the two emitter terminals and having a line length obtained by adding one-fourth of one wavelength of the fundamental signal to an integer multiple of one-half wavelength of the fundamental signal.
    Type: Grant
    Filed: February 22, 2008
    Date of Patent: December 8, 2009
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shinsuke Watanabe, Akira Inoue
  • Publication number: 20090051448
    Abstract: A second harmonic oscillator has a series positive feedback configuration, suppresses output of a fundamental signal, and outputs a second harmonic signal having a frequency in a range from 1 GHz to 200 GHz generated inside of a circuit. The second harmonic oscillator includes: a transistor having a base terminal, a first emitter terminal, a second emitter terminal, and a collector terminal; a resonator circuit connected to the base terminal; a first transmission line short-circuiting stub connected to one of the two emitter terminals; and a second transmission line short-circuiting stub connected to the other of the two emitter terminals and having a line length obtained by adding one-fourth of one wavelength of the fundamental signal to an integer multiple of one-half wavelength of the fundamental signal.
    Type: Application
    Filed: February 22, 2008
    Publication date: February 26, 2009
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shinsuke Watanabe, Akira Inoue
  • Patent number: 7403075
    Abstract: Disclosed is an ultra wide band signal generator. The ultra wide band signal generator generates a signal of a required frequency using a harmonic signal having a frequency range of a ultra wide band (UWB). The ultra wide band signal generator includes an active inductor for generating harmonic signals having power strengths substantially equal to each other within a non-linear operation range, the tunable active inductor capable of tuning a value thereof, an oscillator for amplifying and outputting the harmonic signals generated from the active inductor by frequency-transiting the harmonic signals into high frequency bands, and a filter for selectively outputting one of the harmonic signals output from the oscillator.
    Type: Grant
    Filed: February 2, 2006
    Date of Patent: July 22, 2008
    Assignees: Samsung Electronics Co., Ltd, Georgia Tech Research Corporation
    Inventors: Rajarshi Mukhopadhyay, Sebastien Nuttinck, Yun-Seo Park, Sang-Woong Yoon, Sang-Hyun Woo, Hyun-Il Kang, Chang-Ho Lee, Joy Laskar
  • Publication number: 20080143447
    Abstract: Provided is a high-frequency oscillator whose output power increases without a change in physical size of the entire high-frequency oscillator and deterioration of a phase noise characteristic. The high-frequency oscillator for harmonic extraction includes: an active element (5); a fundamental reflection stub (9) provided on a signal line located on an output side of the active element (5); an output terminal (4); and a harmonic impedance converting circuit (3) interposed between the fundamental reflection stub (9) and the output terminal (4), for converting a harmonic output terminal side load impedance into an optimum value for maximizing harmonic output power, the optimum value being obtained in advance.
    Type: Application
    Filed: March 23, 2007
    Publication date: June 19, 2008
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shinsuke WATANABE, Takayuki MATSUZUKA, Akira INOUE
  • Patent number: 7336136
    Abstract: A transmission oscillator of differential output configuration is incorporated into a high frequency IC. Further, an equivalent impedance having an impedance equivalent to the impedance connected with a regular output terminal is provided. Or, a dummy external terminal for outputting transmit signals in opposite phase is provided. One of the differential outputs of the transmission oscillator is inputted to the power amplifier through the regular output terminal. The other of the differential outputs is connected to the equivalent impedance or the dummy external terminal.
    Type: Grant
    Filed: October 12, 2006
    Date of Patent: February 26, 2008
    Assignee: Renesas Technology Corp.
    Inventors: Koichi Yahagi, Kazuhiko Hikasa, Ryoichi Takano
  • Patent number: 7259636
    Abstract: A synchronous signal generator according to the present invention outputs a pulse with low jitter by setting the sine wave output of a crystal oscillator close to an ideal sine wave, and converting it into a pulse signal. By passing the sine wave output from the crystal oscillator of an oscillation frequency f through a filter unit having an equal center frequency f0, inputting output of a filter unit into a pulse converter, and converting the result into a pulse of a rectangular waveform, thereby obtaining an output signal. By configuring the filter unit by the crystal filter and setting it equal to the crystal oscillator in frequency-temperature characteristic, an output signal can be obtained with low jitter although the temperature changes.
    Type: Grant
    Filed: January 7, 2002
    Date of Patent: August 21, 2007
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventor: Takeo Oita
  • Patent number: 7233211
    Abstract: A divider for a local oscillator (LO) generator system of a phase locked loop (PLL) in a transceiver chip. The divider includes at least one divider unit. Each divider unit includes a frequency divider unit for receiving an input signal having an input frequency and for outputting an output signal having an output frequency which is approximately one half of the input frequency. Each divider unit also includes a resistor bank coupled between a voltage source and the frequency divider unit, and a current stirring unit for supplying current to the frequency divider unit. The resistance of the resistor bank and a magnitude of the current supplied by the current stirring unit are variable depending on the input frequency.
    Type: Grant
    Filed: January 24, 2005
    Date of Patent: June 19, 2007
    Assignee: Broadcom Corporation
    Inventor: Qiang (Tom) Li
  • Patent number: 7167058
    Abstract: A variable frequency oscillator having multiple, independent frequency control inputs, each coupled to a respective tuning sub-circuit. The tuning sub-circuits are connected in parallel with each other and with a resonator module, which may be a quartz crystal, inductor, or other reactance component. Each tuning sub-circuit consists of two varactors with their respective cathodes coupled to each other and to their corresponding frequency control input. By having the tuning sub-circuits connected in parallel to the resonator, the overall frequency pull range of each frequency control input remains unaffected by the activation of any other frequency control input. Preferably, at least one frequency control input is a temperature compensation control input that can maintain the variable oscillator insensitive to temperature variations while the remaining frequency control inputs provide functional frequency control.
    Type: Grant
    Filed: December 11, 2003
    Date of Patent: January 23, 2007
    Assignee: Seiko Epson Corporation
    Inventor: David Meltzer
  • Patent number: 7161440
    Abstract: A temperature compensation circuit has multiple configurable modules to produce a compensation signal whose temperature characteristic curve is the inverse of the frequency-to-temperature characteristic curve of a specified oscillator. A set of first modules that produce first sub-signals directly proportional to temperature and a set of second modules that produce second sub-signals inversely proportional to temperature have their outputs summed at a summation node. Each module may adjust the strength and shaped of its temperature characteristic sub-signal, and each module may optionally be assigned a temperature offset that impedes the output of its corresponding sub-signal until the assigned temperature offset is reached. Each of the first and second modules includes a signal generator and an optional temperature offset circuit, which may be incorporated into the operation of the signal generator.
    Type: Grant
    Filed: December 11, 2003
    Date of Patent: January 9, 2007
    Assignee: Seiko Epson Corporation
    Inventor: David Meltzer
  • Patent number: 6933793
    Abstract: A stable high-frequency clock pulse apparatus and method including frequency source, overtone crystal unit coupled with a negative resistance oscillator, a bandpass overtone filter and a drive level control is provided. The apparatus can include a frequency multiplier. The frequency source can be a micromechanical resonator.
    Type: Grant
    Filed: November 24, 2003
    Date of Patent: August 23, 2005
    Assignee: Vitesse Semiconductor Corporation
    Inventors: Raymond B. Patterson, III, Randy T. Heilman
  • Patent number: 6885255
    Abstract: The invention saves power by supplying minimum clocks required for respective blocks. In a clock control system that supplies clocks to a plurality of blocks, such as a CPU-4, a bus, a peripheral circuit and other circuits, a clock supplied from a clock oscillator is supplied to clock control sections that are connected to the blocks, respectively. The clock is converted by the clock control sections into clocks with minimum clock numbers required to operate the blocks, respectively, and supplied to the blocks.
    Type: Grant
    Filed: February 25, 2003
    Date of Patent: April 26, 2005
    Assignee: Seiko Epson Corporation
    Inventors: Makoto Kudo, Keisuke Hashimoto
  • Patent number: 6885253
    Abstract: A phase-locked loop includes a voltage-controlled oscillator (VCO) to generate a plurality of quadrature-phase signals at one-half an output frequency in response to bias signals. The VCO also includes a times-two multiplier biased by the bias signals to generate the output frequency from the quadrature-phase signals. The bias signals include a load-element bias signal to concurrently bias load elements of buffer stages of the VCO and substantially identical load elements of the multiplier. The bias signal also include a current-source bias signal to concurrently bias current sources of the buffer stages of the VCO and a substantially identical buffer stage of the multiplier. The VCO operating at one-half the output frequency together with the multiplier may consume less power than the VCO when operating at the output frequency.
    Type: Grant
    Filed: June 2, 2003
    Date of Patent: April 26, 2005
    Assignee: Intel Corporation
    Inventor: Rizwan Ahmed
  • Patent number: 6639477
    Abstract: An oscillator has a resonator which includes at least one capacitor and at least one inductor. The resonator supplies a first signal of a first frequency at an output of the resonator. A frequency multiplier or a frequency divider is connected, via an input thereof, to the resonator output. The frequency multiplier or frequency divider supplies a second signal of a second frequency at an output of the frequency multiplier or frequency divider. The second frequency is n times or 1/n times (n≧2 and integer) the first frequency. A tuned circuit is part of the resonator and forms a short circuit or an open connection for the second frequency.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: October 28, 2003
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Marcel Wilhelm R. M van Roosmalen, Berend Hendrik Essink, Christian Alexander Smit
  • Patent number: 6566969
    Abstract: A voltage control oscillator used in mobile communication systems such as cellular phones and video machines. An oscillation output of the first output oscillation circuits (1a) enters a broad band buffer amplifier circuit (4) through a stage-to-stage coupling capacitor (22) and an oscillation output of the second output oscillation circuit (1b) enters the broad band buffer amplifier circuit (4) through frequency selective filters (3a, 3b) and the stage-to-stage coupling capacitor (22). On/off operation of a control voltage of a switch terminal (2) installed on the first or second output oscillation circuit outputs selectively an oscillation signal from the first or second output oscillation circuit.
    Type: Grant
    Filed: September 13, 2001
    Date of Patent: May 20, 2003
    Assignee: Fujitsu Media Devices Limited
    Inventors: Nobuaki Matuo, Alejandro Puel
  • Patent number: 6549083
    Abstract: A high-frequency crystal oscillator capable of outputting a signal at a frequency, for example, higher than 500 MHz without using a multiplication amplifier. The high-frequency crystal oscillator comprises a voltage controlled Colpitts oscillation circuit operating at the fundamental frequency of a quartz-crystal element, means for increasing the level of harmonic component in an output from the Colpitts oscillation circuit, an SAW (Surface Acoustic Wave) filter for selecting a component of a predetermined order of the harmonic component, and a broadband amplifier for amplifying the component selected by the SAW filter. The means for increasing the levels of harmonic component is, for example, a resistor for setting the operating point of a transistor in the oscillation circuit such that an output signal is distorted.
    Type: Grant
    Filed: May 16, 2001
    Date of Patent: April 15, 2003
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Nobuyuki Kanazawa, Takeo Oita, Yuichi Sato
  • Patent number: 6441692
    Abstract: The invention provides a high-speed PLL frequency synthesizer in which the frequency of a reference signal can be made larger than a frequency interval of an external output with a simple configuration. An n-th harmonic of an output of a voltage-controlled oscillator is caused to pass through a band pass filter. The frequency of an output of the band pass filter is divided by M in a variable frequency divider. The phase of an output of the variable frequency divider is compared with that of the reference signal in a phase comparator. An output of the phase comparator is smoothed by a loop filter. The output of the voltage-controlled oscillator is controlled by an output of the loop filter. The fundamental wave of the output of the voltage-controlled oscillator is caused to pass through another band pass filter, and then output to the outside. At this time, the frequency of the reference signal is n times a frequency interval of the fundamental wave of the output of the voltage-controlled oscillator.
    Type: Grant
    Filed: September 17, 1998
    Date of Patent: August 27, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Toshifumi Nakatani, Hisashi Adachi, Hiroaki Kosugi, Yuji Saito, Shunsuke Hirano, Hiroshi Haruki
  • Patent number: 6384691
    Abstract: A high frequency signal source module includes a housing have a high-Q dielectric puck and a transition enclosure employing an antipodal finline transition. A circuit module connected to the high-Q puck includes an oscillator circuit that cooperates with the high-Q puck, and a frequency doubling circuit. In turn, the output of the frequency doubler is coupled to the antipodal finline transition, and thence to the output standard rectangular waveguide.
    Type: Grant
    Filed: March 15, 2000
    Date of Patent: May 7, 2002
    Assignee: TLC Precision Wafer Technology, Inc.
    Inventor: Vladimir Sokolov
  • Patent number: 6373343
    Abstract: An integrated circuit (10) is disclosed comprising a fundamental frequency oscillator comprising a reference node (32) whose voltage varies between a high threshold and a low threshold. The fundamental frequency oscillator is operable to generate a first output at the fundamental frequency on a first output node (36). The integrated circuit (10) also comprises a circuit (C2) coupled to the reference node. The circuit (C2) is operable to sense the voltage at the reference node (32), to determine when the voltage exceeds an intermediate threshold between the high threshold and the low threshold, and to generate a second output in response to the determination. The integrated circuit (10) also comprises logic (40) coupled to the circuit (C2) and load circuitry (50) coupled to the logic (40). The logic (40) is operable to generate an output signal at an output frequency greater than the fundamental frequency in response to the second output and the first output.
    Type: Grant
    Filed: August 28, 2000
    Date of Patent: April 16, 2002
    Assignee: Texas Instruments Incorporated
    Inventors: David J. Baldwin, Christopher M. Cooper, Joseph A. Devore, Ross E. Teggatz
  • Publication number: 20020017959
    Abstract: A high-frequency crystal oscillator capable of outputting a signal at a frequency, for example, higher than 500 MHz without using a multiplication amplifier. The high-frequency crystal oscillator comprises a voltage controlled Colpitts oscillation circuit operating at the fundamental frequency of a quartz-crystal element, means for increasing the level of harmonic component in an output from the Colpitts oscillation circuit, an SAW (Surface Acoustic Wave) filter for selecting a component of a predetermined order of the harmonic component, and a broadband amplifier for amplifying the component selected by the SAW filter. The means for increasing the levels of harmonic component is, for example, a resistor for setting the operating point of a transistor in the oscillation circuit such that an output signal is distorted.
    Type: Application
    Filed: May 16, 2001
    Publication date: February 14, 2002
    Applicant: NIHON DEMPA KOGYO CO., LTD
    Inventors: Nobuyuki Kanazawa, Takeo Oita, Yuichi Sato
  • Publication number: 20010015680
    Abstract: An oscillator has a resonator which includes at least one capacitor and at least one inductor. The resonator supplies a first signal of a first frequency at an output of the resonator. A frequency multiplier or a frequency divider is connected, via an input thereof, to the resonator output. The frequency multiplier or frequency divider supplies a second signal of a second frequency at an output of the frequency multiplier or frequency divider. The second frequency is n times or 1/n times (n≧2 and integer) the first frequency. A tuned circuit is part of the resonator and forms a short circuit or an open connection for the second frequency.
    Type: Application
    Filed: December 20, 2000
    Publication date: August 23, 2001
    Inventors: Marcel Wilhelm R.M van Roosmalen, Berend Hendrik Essink, Christian Alexander Smit
  • Patent number: 6275118
    Abstract: A push—push oscillator is formed by (a) a resonator circuit including a transmission line having one-half wavelength and both ends of the line being left open, and a capacitance for frequency control coupled to the transmission line in parallel, and (b) two oscillators electrically identical to each other and their input sections being coupled to both the ends of the transmission line. Further, this oscillator can take out an output signal of even-order-harmonics from a midpoint of the transmission line in a transmitting direction as well as take out two fundamental waves from respective output sections of two branch oscillators. This push—push oscillator operating with a high frequency is downsized and simplified from a conventional one. Its phase-noise-characteristics and noise immunity are also improved.
    Type: Grant
    Filed: November 24, 1999
    Date of Patent: August 14, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Noriaki Saito, Hiroyuki Yabuki
  • Patent number: 6150890
    Abstract: Disclosed is a dual band wireless phone, such as a cellular phone for a mobile communications system, with a dual band transmitter that includes a phase-locked loop (PLL). The dual band transmitter includes first and second power amplifiers and the PLL. The first power amplifier has a first input for a first signal at a first radio frequency band, and a first output for an amplified first signal. The second power amplifier has a second input for a second signal at a second radio frequency band and a second output for an amplified second signal. The outputs of the power amplifiers are connectable to an antenna. The PLL generates two output frequency ranges and includes a voltage-controlled oscillator (VCO) which has a first output connected to the first power amplifier and generates a first signal. A frequency multiplier has an input connected to the first output of the VCO and a second output connected to the second power amplifier.
    Type: Grant
    Filed: September 30, 1998
    Date of Patent: November 21, 2000
    Assignee: Conexant Systems, Inc.
    Inventors: Morten Damgaard, Leo L. Li
  • Patent number: 6134117
    Abstract: A method for high resolution trimming of PCB components, such as capacitors, inductors, transmission lines, transformers, antennas, resistors, etc. The method includes drilling or milling the PCB to effect the electrical characteristics of the component. The actual component can be machined to reduce the size of the component, or electrical connections to the component can be severed. The method can be used to set the capacitance of a tuning capacitor for an oscillator circuit. The tuning capacitor is etched out of the conductive planes on opposing sides of the PCB. The dielectric substrate of the PCB acts as the dielectric for the capacitor. The conductive planes are also etched to define conductive traces and connection pads suitable for surface mounting and electrically connecting the various electrical components on the PCB. The area of the selectively etched capacitive plates has a capacitance that is predetermined.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: October 17, 2000
    Assignee: Delphi Technologies, Inc.
    Inventors: John David Funk, Paul John Dobosz
  • Patent number: 6057740
    Abstract: A method and a stable local oscillator system for providing a signal centered at a frequency of interest to a radio frequency (RF) converter. The method includes the following steps: (a) generating an output signal which comprises a fundamental signal centered at a fundamental frequency and a harmonic signal centered at the frequency of interest which is equal to an integral multiple of the fundamental frequency; (b) amplifying the output signal such that the harmonic signal is amplified more than the fundamental signal; and (c) bandpass filtering the amplified output signal such that the amplified fundamental signal is substantially suppressed and the amplified harmonic signal is used as a local oscillator in the RF converter. An example is given for the case where the fundamental frequency is 1.67 gigahertz (GHz), and the frequency of interest is 3.34 GHz which is the second harmonic.
    Type: Grant
    Filed: April 6, 1998
    Date of Patent: May 2, 2000
    Assignee: Northrop Grumman Corporation
    Inventors: Stephen James Consolazio, Dave Biscan, Albert Ferek
  • Patent number: 5973570
    Abstract: A frequency multiplier (120) having a tunable resonant circuit (122), is anticipated for use with a frequency synthesizer (100) having a Voltage Controlled Oscillator (110). The VCO control line (116) voltage establishes the VCO (110) fundamental frequency (.function.o) as well as the resonant circuit (122) center frequency, such that the resonant circuit (122) frequency response will track a desired harmonic component within the multiplier output (130) even as the VCO control line (116) voltage and the fundamental frequency (.function.o) change in response to control line variation.
    Type: Grant
    Filed: November 12, 1998
    Date of Patent: October 26, 1999
    Assignee: Motorola, Inc.
    Inventors: Raul Salvi, Ramon Ponce, Armando J. Gonzalez
  • Patent number: 5903196
    Abstract: A frequency multiplier (120) having a tunable resonant circuit (122), is anticipated for use with a frequency synthesizer (100) having a Voltage Controlled Oscillator (110). The VCO control line (116) voltage establishes the VCO (110) fundamental frequency (.function..sub.o) as well as the resonant circuit (122) center frequency, such that the resonant circuit (122) frequency response will track a desired harmonic component within the multiplier output (130) even as the VCO control line (116) voltage and the fundamental frequency (.function..sub.o) change in response to control line variation.
    Type: Grant
    Filed: April 7, 1997
    Date of Patent: May 11, 1999
    Assignee: Motorola, Inc.
    Inventors: Raul Salvi, Ramon Ponce, Armando J. Gonzalez
  • Patent number: 5712596
    Abstract: In an oscillator arrangement (VCXO), an oscillation loop (OSL) oscillates at, approximately, the fundamental frequency of a crystal (XTL) included therein. The output signal (Sosc) of the oscillator arrangement (VCXO) is a harmonic extracted from the oscillation loop (OSL). To vary the frequency of the output signal (Sosc), a tuning circuit (VAR) is included in the oscillation loop (OSL). A stage (FIL) in the oscillator arrangement (VCXO) prevents harmonic feedback into the oscillation loop (OSL). Such an oscillator arrangement (VCXO) can be tuned over a relatively large frequency range and has a monotonous tuning characteristic.
    Type: Grant
    Filed: June 20, 1996
    Date of Patent: January 27, 1998
    Assignee: U.S. Philips Corporation
    Inventor: Alfonsus M. Van Amesfoort
  • Patent number: 5694091
    Abstract: A circuit arrangement is indicated to generate a clock frequency for a data transmission system by using a voltage-controlled fundamental wave quartz oscillator (VCXO), whose frequency can be changed within narrow limits as a function of the control voltage. To double the frequency of the fundamental wave quartz oscillator (VCXO), its output (A) is connected to the input of a rectifier bridge circuit (1) having an ohmic resistance (2) placed at its output. The ohmic resistance (2) is connected to both inputs of a comparator (3), and the clock frequency (f) is present at the output of the comparator.
    Type: Grant
    Filed: October 9, 1996
    Date of Patent: December 2, 1997
    Assignee: ke Kommunikations-Elektronik GmbH & Co.
    Inventor: Andreas Hennig
  • Patent number: 5587690
    Abstract: A first oscillator includes: a ring resonator; an oscillation circuit having a negative resistance active circuit coupled to a first point on the ring resonator for oscillating at an oscillation frequency and resonating the resonator; an output terminal, coupled to a second point on the ring resonator where a voltage is substantially zero with respect to the predetermined frequency when the ring resonator resonates, for outputting a resonant frequency signal, wherein even order harmonic components are outputted with the fundamental component suppressed. A second oscillator includes a ring resonator having points A to D equidistantly dividing the ring resonator, first and second oscillation circuits coupled to the points A and B respectively, first and second grounding capacitors having capacitance equivalent to those of the first and second oscillation circuits. Thus, two independent oscillators which do not affect each other are provided with a single resonator.
    Type: Grant
    Filed: July 31, 1995
    Date of Patent: December 24, 1996
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroyuki Yabuki, Morikazu Sagawa, Mitsuo Makimoto
  • Patent number: 5567994
    Abstract: A hybrid active filter shunts three-phase power with passive elements tuned to have low impedance at a frequency of harmonic distortion. The passive elements are in series with controlled voltages sources providing cancelling currents to the harmonic currents. Rapid determination of the harmonic currents is provided in real-time through the use of a Park transformation reducing the variables which need to be manipulated. Measured currents as transformed are used to model undistorted current based on an average power consumed by the load. When the undistorted current is subtracted from the actual current, a harmonic current signal is produced that may be used to drive the voltage sources. The time domain method requires rapidly computed running averages and thus may be performed in-between the acquisition of the measured current samples.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: October 22, 1996
    Assignee: Allen-Bradley Company, Inc.
    Inventors: Gerald W. Davis, Shiping Huang, Peter J. Unsworth
  • Patent number: 5477112
    Abstract: Briefly, to reduce switching stresses, employed is a high-frequency AC power source (110) and a current-limiting (ballasting) network (116). The network ( 116 ) includes a high-frequency trap ( 120 ) and an impedance transforming network (122), which is coupled to the AC power source (110) by the trap (120) and which is for connection to a load that includes at least one gaseous discharge (fluorescent) lamp or other non-linear or negative-resistance load (102). The trap, which has the parallel resonant combination of an inductor ( 130 ) and a capacitor ( 132 ), is resonant at a frequency chosen such that the switching-circuit transistor(s) (210, or 230 and 232, or 250 and 252, or 270 and 272, or 708) of the AC power source (110) switch at times when the level of the current (charge flowing) therein and/or the voltage developed there across is zero, preferably, at a frequency slightly higher than a harmonic frequency of the high-frequency AC power source ( 110 ).
    Type: Grant
    Filed: April 27, 1993
    Date of Patent: December 19, 1995
    Assignee: Electronic Lighting, Inc.
    Inventor: Ronald A. Lesea
  • Patent number: 5418500
    Abstract: A high-frequency oscillator circuit designed to efficiently output fundamental and second harmonic waves. A second harmonic resonance circuit is inserted between bases of a pair of transistors having collectors connected to each other. Each of a pair of capacitors is inserted between the base and an emitter of the corresponding one of the pair of transistors, and each of another pair of capacitors is inserted between the emitters of the transistors. Further, a pair of fundamental wave output terminals for outputting fundamental waves are respectively connected to the bases of the transistors, and a pair of second harmonic output terminals for outputting second harmonic waves are respectively connected to a connection between the second pair of capacitors and a connection point between the collectors of the pair of transistors.
    Type: Grant
    Filed: March 16, 1993
    Date of Patent: May 23, 1995
    Assignee: Alps Electric Co., Ltd.
    Inventor: Sadao Igarashi
  • Patent number: 5373260
    Abstract: A surface acoustic wave resonator has a plural number N of interdigital transducers arranged in a sequence on a piezoelectric substrate to generate N surface acoustic wave signals with a predetermined frequency f.sub.0 and having phase difference of 2.pi./N radian therebetween. Oscillation circuits are individually connected to the N interdigital transducers and generate N oscillation signals with the same frequency f.sub.0 and having phase difference of 2.pi./N radian therebetween. These oscillation signals are multiplied together to generate a signal with frequency N times the predetermined frequency f.sub.0.
    Type: Grant
    Filed: December 2, 1993
    Date of Patent: December 13, 1994
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Akira Kato
  • Patent number: 5357221
    Abstract: Electronic apparatus generates first and second output signals having a quadrature phase relationship therebetween. A local oscillator signal with a reference phase is applied as an input to first and second signal branches. The second signal branch includes a phase control circuit for subjecting input signals passing therethrough to a determined phase shift. The phase control circuit is responsive to an applied DC control signal to adjust any phase shift error through the phase shift circuit from a predetermined phase shift to assure that the second output signal exhibits the required quadrature phase relationship to the first output signal. A memory/microprocessor combination stores a digital value that is indicative of a DC control signal which must be applied to the control circuit to alter the phase shift through the phase control circuit to the predetermined phase shift. The microprocessor accesses the digital parameter and applies it to the phase control circuit through a digital to analog converter.
    Type: Grant
    Filed: August 25, 1992
    Date of Patent: October 18, 1994
    Assignee: Nokia Mobile Phones Ltd.
    Inventor: Jorma Matero
  • Patent number: 5307029
    Abstract: Generation of multiple, harmonically related frequency outputs is achieved using a digital asymmetrical harmonic waveform generator, such as a high speed digital frequency divider, for example. The digital frequency divider is used with a division ratio that provides a nonsymmetrical waveform that generates a fundamental and odd and even harmonics of the fundamental derived from a reference frequency signal. The harmonically related frequency outputs from the digital frequency divider may be buffered, filtered, and mixed with the reference frequency signal to obtain a series of clean, single frequency tones suitable for use as frequency conversion local oscillator signals. The result is a small, low power, low cost multiple frequency tone generator.
    Type: Grant
    Filed: July 10, 1992
    Date of Patent: April 26, 1994
    Assignee: Hughes Aircraft Company
    Inventor: D. Stuart Schenk
  • Patent number: 5250910
    Abstract: A push-push oscillator including a resonator having a transmission line and a capacitance connected to the transmission line in parallel; an oscillating circuit responsive to the resonator for oscillating and for producing first and second outputs having an antiphase relation therebetween; an in-phase combining circuit for summing the first and second outputs of said oscillating circuit to produce a summed signal; and an antiphase combining circuit responsive to two components from the resonator having an antiphase relation for producing a differential signal in accordance with a difference between the two components. Alternatively, the in-phase combining circuit is connected to the resonator and the antiphase combining circuit is connected to the oscillating circuit. The antiphase combining circuit outputs a fundamental wave component of the resonator. The in-phase combining circuit outputs a second harmonic wave component.
    Type: Grant
    Filed: August 6, 1992
    Date of Patent: October 5, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroyuki Yabuki, Isao Ishigaki, Mitsuo Makimoto
  • Patent number: 5233351
    Abstract: An improved local oscillator arrangement for a monopulse receiver in a semiactive missile guidance system is shown. The monopulse receiver includes an improved reference local oscillator wherein a first local oscillator signal and a pair of reference signals required to demodulate the output of the intermediate frequency section of such receiver are derived simultaneously from the output of a single voltage controlled crystal oscillator. The frequencies of the first local oscillator and the pair of reference signals are related to the frequency of the radar modified by any Doppler shift frequency experienced during an intercept.
    Type: Grant
    Filed: August 26, 1975
    Date of Patent: August 3, 1993
    Assignee: Raytheon Company
    Inventors: Nicholas Gregory, William M. Murphy
  • Patent number: 5223801
    Abstract: An improved short distance, battery powered, amplitude modulated RF transmitter for transmitting encoded security data. An oscillator stage provides a control crystal and filter which are feedback coupled between the emitter and base of a transistor to oscillate at the fifth overtone of the fundamental crystal frequency. A filter tuned to the third harmonic of the overtone frequency selects the carrier frequency which is coupled via a resistive attenuator to an amplifier/filter stage, before the carrier is amplitude modulated with encoded security data. The improved transmitter circuit compensates for crystals exhibiting variations in series resistance and provides increased output power and improved frequency stability to temperature and over time. A foil antenna stage is augmented with the plates of the battery power supply to further improve performance.
    Type: Grant
    Filed: March 30, 1992
    Date of Patent: June 29, 1993
    Assignee: Interactive Technologies, Inc.
    Inventor: John Bergman
  • Patent number: 5013974
    Abstract: An inverter-type electronic fluorescent lamp ballast powers a fluorescent lamp with a sinusoidal current that is modified by insertion of a measured amount of properly phased third harmonic current, thereby attaining a lamp current crest factor that is substantially better than the 1.4 crest factor associated with a purely sinusoidally-shaped current.
    Type: Grant
    Filed: August 24, 1987
    Date of Patent: May 7, 1991
    Inventor: Ole K. Nilssen