Capacitor Only Modified Or Substituted By Switching Patents (Class 334/55)
  • Patent number: 10363418
    Abstract: An implantable processor arrangement is described for an active implantable medical device (AIMD) system implanted under the skin of a patient. An implantable communications coil arrangement is configured for transdermal transfer of an implant communications signal. An implantable processor is coupled to and controls the implantable communications coil arrangement so as to operate in two different communications modes. In a normal operation mode, the processor configures the communications coil arrangement for peridermal communication with an external communications coil placed on the skin of the patient immediately over the implantable communications coil arrangement using load modulation of the communications coil arrangement, wherein the implantable communications coil has a resonance frequency matching the transmission frequency.
    Type: Grant
    Filed: September 15, 2017
    Date of Patent: July 30, 2019
    Assignee: MED-EL Elektromedizinische Geraete GmbH
    Inventors: J├╝rgen Wissenwasser, Andreas Mitterer
  • Publication number: 20150015346
    Abstract: A device comprises a first variable capacitance block comprising four first capacitors, a second variable capacitance block comprising four second capacitors, wherein the second capacitors are arranged in a same configuration as the first capacitors, a third variable capacitance block comprising four third capacitors, a fourth variable capacitance block comprising four fourth capacitors, and wherein the fourth capacitors are arranged in a same configuration as the third capacitors, a first switch coupled between the first variable capacitance block and the second variable capacitance block, a second switch coupled between the third variable capacitance block and the fourth variable capacitance block, a third switch coupled between the first variable capacitance block and the fourth variable capacitance block and a fourth switch coupled between the third variable capacitance block and the second variable capacitance block.
    Type: Application
    Filed: September 25, 2014
    Publication date: January 15, 2015
    Inventors: Chewn-Pu Jou, Feng Wei Kuo
  • Publication number: 20140340181
    Abstract: In accordance with an embodiment, a switchable capacitance circuit includes a plurality of capacitance-switch cells that each has a first semiconductor switching circuit and a capacitance circuit having a first terminal coupled to the first semiconductor switching circuit. A resistance of the first semiconductor switching circuit of a first switch-capacitance cell of the plurality of capacitance-switch cells is within a first tolerance of a resistance of the first semiconductor switching circuit of a second capacitance-switch cell of the plurality of capacitance-switch cells, and a capacitance of the capacitance circuit of the first capacitance-switch cell is within a second tolerance of a capacitance of the capacitance circuit of the second capacitance-switch cell.
    Type: Application
    Filed: May 14, 2013
    Publication date: November 20, 2014
    Applicant: Infineon Technologies AG
    Inventor: Winfried Bakalski
  • Publication number: 20140334362
    Abstract: A tunable diplexer includes a high band port, a low band port, an antenna port, a high pass filter, and a low pass filter. The high pass filter is coupled between the high band port and the antenna port, and is configured to pass signals within a high pass band between the high band port and the antenna port. The high pass filter includes a high band path stop band zero, which is configured to selectively attenuate signals within a high band path stop band. The low pass filter is coupled between the low band port and the antenna port, and is configured to pass signals within a low pass band between the low band port and the antenna port. The low pass filter includes a low band path stop band zero, which is configured to selectively attenuate signals within a low band path stop band.
    Type: Application
    Filed: July 28, 2014
    Publication date: November 13, 2014
    Inventor: Marcus Granger-Jones
  • Publication number: 20140184363
    Abstract: An electronic device includes an inductive element, and variable capacitors. Each variable capacitor includes: first and third capacitors, both having a first terminal electrically connected to a first terminal of the inductive element; and second and fourth capacitors, both having a first terminal electrically connected to a second terminal of the inductive element. A first switch circuit electrically connects or isolates a second terminal of the first capacitor to/from a second terminal of the second capacitor. A second switch circuit electrically connects or isolates a second terminal of the third capacitor to/from a second terminal of the fourth capacitor. A third switch circuit electrically connects or isolates the second terminal of the first capacitor to/from the second terminal of the fourth capacitor. A fourth switch circuit electrically connects or isolates the second terminal of the third capacitor to/from the second terminal of the second capacitor.
    Type: Application
    Filed: May 24, 2013
    Publication date: July 3, 2014
    Applicant: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventors: Chewn-Pu Jou, Ying-Ta Lu, Hsien-Yuan Liao
  • Patent number: 8723612
    Abstract: A semiconductor trimming circuit includes parallel coupled PMOS devices coupled in parallel with parallel coupled NMOS devices and an additional pair of dummy NMOS devices. The dummy NMOS devices are coupled in parallel with the NMOS devices. A trimming circuit for an internal clock source may be formed with an array of such switches for selecting one or more trimming capacitors of the trimming circuit. Such an array has a low leakage current and permits good trimming linearity.
    Type: Grant
    Filed: September 9, 2012
    Date of Patent: May 13, 2014
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Xiuqiang Xu, Jie Jin, Yizhong Zhang
  • Publication number: 20110316654
    Abstract: A system and method for sharing a switched capacitor array (SCA) by two tuning circuits are disclosed. In a multiple-band radio receiver, there is a need to use multiple tuning circuits for signals in different bands. The tuning circuit typically comprised an adjustable capacitance device and other tuning components, where the adjustable capacitance device is often implemented in SCA. The present invention discloses a system and method comprising n sections of capacitor elements where each capacitor element comprises a capacitor and switches to selectively connect the capacitor to one of the tuning circuit. Consequently, the SCA can be shared by the two tuning circuits. The control bits for the switched may be provided from a programmable control register.
    Type: Application
    Filed: June 24, 2010
    Publication date: December 29, 2011
    Applicant: QUINTIC HOLDINGS
    Inventors: Hao Meng, Peiqi Xuan
  • Publication number: 20110025436
    Abstract: Embodiments of a capacitive tuning system implementing a tunable capacitive array are presented herein. The tunable capacitive array includes both scaled coarse capacitors and one or more fine capacitors. The one or more fine capacitors advantageously reduce a differential nonlinearity associated with the scaled coarse capacitors. The use of fine capacitors limits additional area requirements in an integrated circuit implementation, while improving the accuracy of the capacitive tuning system.
    Type: Application
    Filed: August 24, 2009
    Publication date: February 3, 2011
    Applicant: Broadcom Corporation
    Inventors: Amir Hadji-Abdolhamid, Hooman Darabi
  • Publication number: 20100156574
    Abstract: An information processing apparatus having a non-contact IC portion which performs radio communication with a reader/writer is provided. The non-contact IC portion includes: capacitors connected so that capacitance can be changed between multiple stages; a coil connected to the capacitors; and a switching portion which turns on/off connection of the capacitors so that a resonance frequency expressed based on capacitance of the capacitors and inductance of the coil is set within a given effective resonance frequency range.
    Type: Application
    Filed: December 17, 2009
    Publication date: June 24, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Kouichi NOHARA
  • Publication number: 20100093294
    Abstract: The circuit device for detection includes: a first terminal 3 and a second terminal 4; a reference terminal 5; a reception frequency tuning section including a first tuning capacitor 6a provided between the first terminal 3 and the reference terminal 5, a second tuning capacitor 6b provided between the second terminal 4 and the reference terminal 5, a first switch 9a connected in series with the first tuning capacitor 6a between the first terminal 3 and the reference terminal 5, and a second switch 9b connected in series with the second tuning capacitor 6b between the second terminal 4 and the reference terminal 5; and a control circuit section including a first control circuit 12a for controlling the operation of the first switch 9a and a second control circuit 12b for controlling the operation of the second switch 9b.
    Type: Application
    Filed: October 15, 2008
    Publication date: April 15, 2010
    Inventors: Yoshihide Kanakubo, Noboru Nakashima, Kenichi Kurashina
  • Publication number: 20100085134
    Abstract: A microwave lens having an array of electronic inductive capacitive cells wherein each cell includes an electrically conductive pattern which responds to incident microwave electromagnetic energy as an LC resonator. At least one of the cells includes at least one MEMS device which is movable in response to an electrical bias to thereby vary the resonant frequency of that cell. In order to bias the MEMS device, an electrical insulating layer extends along a portion of the pattern of the cell and to both sides of the MEMS device. An electrically conductive strip then extends over the insulating layer so that the conductive strip is electrically insulated from the pattern while electrically connected to the MEMS device.
    Type: Application
    Filed: October 2, 2008
    Publication date: April 8, 2010
    Applicant: Toyota Motor Engineering & Manufacturing North America, Inc.
    Inventors: Jae Seung Lee, Serdar H. Yonak
  • Publication number: 20100039194
    Abstract: A frequency tuning device for use in a crystal oscillator circuit includes a first fine tuning array of capacitors, a second fine tuning array of capacitors and a coarse tuning array of capacitors coupled in parallel to produce a tuning capacitance for tuning the crystal oscillator. The first fine tuning array of capacitors includes a binary weighted switched capacitor network, the second fine tuning array of capacitors includes a thermometer coded switched capacitor network and the coarse tuning array of capacitors includes a binary weighted switched capacitor network with a different unit capacitance value than the first and second fine tuning arrays.
    Type: Application
    Filed: September 30, 2008
    Publication date: February 18, 2010
    Applicant: BROADCOM CORPORATION
    Inventors: Hooman Darabi, Yuyu Chang, Zhimin Zhou, Morteza Vadipour
  • Patent number: 7566994
    Abstract: According to an example embodiment, an apparatus is provided that produces a small-step switchable capacitor, which can have steps that are smaller in value than the smallest capacitor used in the system. In one embodiment, an input signal is connected to a switchable capacitor system that includes at least one and/or a plurality of small-step, switchable capacitors. In an example embodiment, a capacitor system may be provided that includes a first capacitance block coupled in series with a second capacitance block. In an example embodiment, the second capacitance block may include one or more switchable capacitors to provide a step in capacitance for the capacitor system between a first setting and a second setting using the one or more switchable capacitors. Also, in an example embodiment, the step in capacitance of the capacitor system may be determined based, at least in part, on a ratio of the capacitance of the second capacitance block to the capacitance of the first capacitance block.
    Type: Grant
    Filed: January 31, 2006
    Date of Patent: July 28, 2009
    Assignee: Broadcom Corporation
    Inventors: Ali Medi, Hooman Darabi
  • Publication number: 20090134949
    Abstract: An apparatus for matching impedance within a Radio Frequency (RF) integrated circuit is presented. The apparatus includes a first impedance element placed in an RF signal path, an first inductor fabricated on the integrated circuit and connected to the first impedance element, and an adjustable capacitance circuit connected in series with the first inductor and placed between the first inductor and a ground node, where the adjustable capacitance circuit is adjusted to tune the inductance of the first inductor. A method for tuning an inductor is presented. The method includes ascertaining a target inductance value for an inductor in a RF integrated circuit, and determining a capacitance value of an adjustable capacitance circuit so that, when coupled to the inductor, the combined impedance of the adjustable capacitance circuit and the inductor is tuned to the ascertained target inductance value.
    Type: Application
    Filed: November 27, 2007
    Publication date: May 28, 2009
    Applicant: QUALCOMM INCORPORATED
    Inventor: Allen Nan He
  • Publication number: 20090021332
    Abstract: An integrated variable capacitance with low losses comprises an array (1) of switched capacitors (2-8). When using an array (1) of switched capacitors (2-8) to form a quasi continuously variable capacitor, a continuity of capacitance as function of the digital control signal to the array (1) leads to overall behavior of the series resistance of the array (1) as function of the capacitance that for some applications may be undesirable. Therefore a topology for a switched array (1) is proposed that allows to set series resistance relatively independent from capacitance. The array (1) may be fully or partially integrated in tunable LC filters, also in TV tuners.
    Type: Application
    Filed: October 5, 2005
    Publication date: January 22, 2009
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Johannes Hubertus Antonius Brekelmans, Vincent Rambeau, Jan Van Sinderen, Marc Godfriedus Marie Notten
  • Patent number: 7436276
    Abstract: A tuning circuit comprises, at least, a first circuit K1 which serially connects a first variable capacitor element 21a and a second variable capacitor element 31a, an inductance element 23a which is parallely connected to the first circuit K1 and constitutes a resonance circuit with the first circuit K1; a second circuit K2 which includes a switch element 26a and a third resistor 27a serially connected to each other and is parallely connected to the first circuit K1; and a first resistor 24a and a second resistor and 25a which are connected to both ends of the first variable capacitor element 21a, respectively and apply a predetermined tuning voltage.
    Type: Grant
    Filed: July 5, 2006
    Date of Patent: October 14, 2008
    Assignee: Alps Electric Co., Ltd.
    Inventors: Takeo Suzuki, Shigeru Osada
  • Publication number: 20080186115
    Abstract: Disclosed herein is a method for adjusting the tuning frequency of a tuning circuit, which is implemented as a parallel circuit of a coil and series circuits Ai each including a capacitor Ci and a switch device Qi (i=one to n, where n denotes an integer at least equal to two), by varying the tuning frequency through control to turn on and off the switch devices Qi in accordance with control data bi, the method for adjusting the tuning frequency of a tuning circuit including the steps of: finding control data bi for a desired tuning frequency from control data bi for a tuning frequency equal to a first frequency and control data bi for a tuning frequency equal to a second frequency; and applying the control data bi found for the desired tuning frequency to the switch devices Qi.
    Type: Application
    Filed: February 1, 2008
    Publication date: August 7, 2008
    Applicant: SONY CORPORATION
    Inventor: Taiwa Okanobu
  • Patent number: 6889036
    Abstract: An integrated center frequency selectable resonant coupling network suited for use in an integrated circuit is disclosed. The network includes an integrated coupling transformer having a secondary winding for coupling to a load and a primary winding for coupling to a source; a first integrated capacitive circuit controllably coupled across one of the primary and secondary windings and when so coupled operable to resonate with the integrated coupling transformer at a frequency in a first frequency band; and a second integrated capacitive circuit coupled across a second one of the primary and the secondary windings that is operable to resonate with the integrated coupling transformer at a frequency in a second frequency band.
    Type: Grant
    Filed: March 7, 2002
    Date of Patent: May 3, 2005
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Brian M. Ballweber, Stephen W. Dow
  • Patent number: 6433658
    Abstract: A structure (110, 150) for enhancing the quality factor (Q) of a capacitive circuit (112, 152). The capacitive circuit (112, 152) includes a first resistance (122, 164), a capacitance (124, 166), and a second resistance (126, 168). The capacitance (124, 166) represents the net capacitance of the capacitive circuit (112, 152), and the first resistance (122, 164) and second resistance (126, 168) represent elements of the intrinsic resistance of the capacitive circuit (112, 152). In a one embodiment the structure (110) includes a first capacitor (128) which is connected in parallel with the capacitive circuit (112), and second capacitor (130) which is connected in series with the capacitive circuit (112).
    Type: Grant
    Filed: April 4, 2000
    Date of Patent: August 13, 2002
    Assignee: Maxim Integrated Products, Inc.
    Inventor: Ali Rastegar
  • Patent number: 6239675
    Abstract: An electronic system 8 is disclosed herein. The system includes circuitry 10 for processing a signal and a plurality of antennas 12a-12b. A plurality of switches 22a-22b are also included. Each of the switches 22a-22b is coupled between the processing circuitry 10 and a corresponding one of the antennas 12a-12b. Each of the switches 22a-22b includes first and second power MOSFETs where the source of the first MOSFET is coupled to the source of the second MOSFET. The system further includes circuitry 28 for selecting of one of the plurality of switches 22a-22b to be on.
    Type: Grant
    Filed: July 15, 1999
    Date of Patent: May 29, 2001
    Assignee: Texas Instruments Incorporated
    Inventor: Thomas Flaxl
  • Patent number: 6232847
    Abstract: A high-Q precision integrated reversibly trimmable singleband oscillator and tunable multiband oscillator are presented that overcome the problems laser trimming and solid state switches. This is accomplished using micro-electromechanical system (MEMS) technology to integrate an amplifier and its tunable LC network on a common substrate. The LC network can be configured to provide a very narrow bandwidth frequency response which peaks at one or more very specific predetermined frequencies without de-Qing the oscillator.
    Type: Grant
    Filed: May 28, 1998
    Date of Patent: May 15, 2001
    Assignee: Rockwell Science Center, LLC
    Inventors: Henry O. Marcy, 5th, Kenneth D. Pedrotti, David R. Pehlke, Charles W. Seabury, Jun J. Yao, James L. Bartlett, Mau Chung F. Chang, Deepak Mehrotra, J. L. Julian Tham
  • Patent number: 6181218
    Abstract: The invention provides a unique apparatus and method which varies the capacitance coupled to a circuit. In one embodiment, the variable capacitance comprises a unique variable capacitance array with multiple capacitance modules which can be selectively enabled. Each capacitance module has a capacitive value and a corresponding parasitic capacitance. The invention provides high linearity, low spread, improves the response to power fluctuations by maintaining a consistent relationship between the capacitive value and the parasitic capacitance in each capacitance module. For example, the invention can be used with devices to provide a linear variation of capacitance. In addition, the invention can be used to calibrate a wide range of devices.
    Type: Grant
    Filed: May 19, 1998
    Date of Patent: January 30, 2001
    Assignee: Conexant Systems, Inc.
    Inventors: Ricke W. Clark, Jorge A. Grilo, Bo Zhang
  • Patent number: 5953642
    Abstract: In a system for contactless power and data transmission, a transmitting or receiving station has at least one transmitting or receiving resonant circuit which is driven by an integrable control circuit. The integrated control circuit has a multiplicity of capacitors which can be switched in, in parallel with the resonant circuit. A device is provided for driving the switching device.
    Type: Grant
    Filed: April 28, 1997
    Date of Patent: September 14, 1999
    Assignee: Siemens Aktiengesellschaft
    Inventors: Martin Feldtkeller, Reinhard Greiderer, Kurt Marquardt, Jurgen Nolles, Robert Reiner
  • Patent number: 5880921
    Abstract: A monolithically integrated switched capacitor bank using MEMS technology that is capable of handling GHz signal frequencies in both the RF and millimeter bands while maintaining precise digital selection of capacitor levels over a wide tuning range. Each MEMS switch includes a cantilever arm that is affixed to the substrate and extends over a ground line and a gapped signal line. An electrical contact is formed on the bottom of the cantilever arm positioned above and facing the gap in the signal line. A top electrode atop the cantilever arm forms a control capacitor structure above the ground line. A capacitor structure, preferably a MEMS capacitor suspended above the substrate at approximately the same height as the cantilever arm, is anchored to the substrate and connected in series with a MEMS switch.
    Type: Grant
    Filed: April 28, 1997
    Date of Patent: March 9, 1999
    Assignee: Rockwell Science Center, LLC
    Inventors: J.L. Julian Tham, James L. Bartlett, Mau Chung F. Chang, Henry O. Marcy, 5th, Deepak Mehrotra, Kenneth D. Pedrotti, David R. Pehlke, Charles W. Seabury, Jun J. Yao
  • Patent number: 5841334
    Abstract: An RF capacitor circuit having a plurality of capacitors and a method of electronically tuning such circuit is disclosed. The method includes the steps of connecting the capacitors in parallel relation so as to have common nodes and electronically eliminating any number of the capacitors in order to obtain a desired total capacitance for the circuit. The method further includes either connecting a fuse in series relation with each capacitor, wherein each fuse has a designated current rating above which it prevents current from passing to its associated capacitor, or providing each capacitor with a unique breakdown voltage/current. Thus, when a voltage is provided to an input of the circuit, either the current rating of a designated number of fuses or the breakdown voltage/current of a designated number of capacitors is exceeded. Such capacitors are then electronically eliminated and the circuit is tuned to the desired total capacitance.
    Type: Grant
    Filed: December 24, 1996
    Date of Patent: November 24, 1998
    Assignee: Ericsson Inc.
    Inventor: Allen M. East
  • Patent number: 5821838
    Abstract: The double tuning circuit of a TV tuner provided by the present invention comprises a primary tuning circuit and a secondary tuning circuit coupled with each other wherein at least one of the primary and secondary tuning circuits comprises two series circuits connected to each other in parallel with each of the two series circuits including damping resistors and/or resonance capacitors in addition to switching diodes which are each selectively turned on and off by using a predetermined switching voltage corresponding to signal reception states so that the frequency response of an intermediate-frequency signal obtained on the output side of the double tuning circuit is fixed independently of a channel receiving the incoming signal and the intensity of the electric field of the incoming signal.
    Type: Grant
    Filed: December 4, 1996
    Date of Patent: October 13, 1998
    Assignee: Alps Electric Co., Ltd.
    Inventors: Takeo Suzuki, Masaki Yamamoto, Masashi Suzuki, Yasuharu Kudo
  • Patent number: 5473291
    Abstract: A solid state automatic tuner is used in a plasma processing system for measuring and adjusting a voltage standing wave ratio of the system. The tuner has a switched variable inductor circuit controlled by an automatic control system coupled to an impedance matching circuit. The impedance matching circuit provides an intermediate impedance and matches an output impedance of an RF generator to the varying impedance of a plasma chamber. A variable inductor of the switched variable inductor is constructed as a transformer and allows different values of inductance to be switched in and out of a secondary winding of the transformer. FET switches control pin diodes permitting the different values of inductance to be switched in and out in steps. A VSWR comparator of the control system continuously compares a desired VSWR set point for the system to the current VSWR of the system. A sequence scanner controls the FET switches.
    Type: Grant
    Filed: April 27, 1995
    Date of Patent: December 5, 1995
    Assignee: Brounley Associates, Inc.
    Inventor: Richard W. Brounley
  • Patent number: 5300904
    Abstract: The invention concerns a circuit for the resonant cavity in a frequency-shift HF transmitter output stage, with a first capacitance (2), a first inductance (3) and a first switch (5) for feeding the HF signal to the resonant cavity. To switch the resonant cavity over to resonance with the other transmission frequency, additional capacitance (2a) can be switched in or out of the cavity by means of additional switch means (4).
    Type: Grant
    Filed: September 1, 1992
    Date of Patent: April 5, 1994
    Assignee: Topholm & Westermann ApS
    Inventor: Henning H. Andersen
  • Patent number: 5065121
    Abstract: A switchable resonator device having a selectable center frequency over a wide radio frequency range comprising a radio frequency signal input and output means, a resonator structure connected between the signal input and output means for respectively receiving and delivering radio frequency input and output signals, the resonator structure using a strip line conductor having a first conductor element with first and second extending portions each providing respective inductance properties, a first switchable means for controllably connecting the first portion of the first conductor element at selected locations along its extension with the second element for varying its inductive properties, a second switchable means for controllably providing a selected capacitance between the second portion of the first conductor element and the second conductor element, and control means providing a control signal to the first and second switchable means for selecting and changing the center frequency of the resonator devi
    Type: Grant
    Filed: March 29, 1988
    Date of Patent: November 12, 1991
    Assignee: RF Products, Inc.
    Inventor: Masood Ghadaksaz
  • Patent number: 4890063
    Abstract: A probe coil system for a magnetic resonance (MR) apparatus includes a plurality of coil elements, a plurality of shortening capacitor elements, and first and second capacitors. The plurality of shortening capacitor elements are inserted between and in series with the coil elements. The first capacitor is connected in parallel with the coil elements and the shortening capacitor elements. The second capacitors are connected at least in series with the coil elements and the shortening capacitor elements. Each of the shortening capacitor elements includes a plurality of capacitors and a plurality of switches, selectively opened and closed to switch a total capacitance of the plurality of capacitors, allowing selection of one of a plurality of resonance frequencies by adjusting the first and second capacitors within a predetermined range.
    Type: Grant
    Filed: August 9, 1988
    Date of Patent: December 26, 1989
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Motoji Haragashira
  • Patent number: 4802238
    Abstract: In a radio receiver which can be switched between at least two waveranges, the coil winding (33) of the oscillator circuit (31) has a further coil winding (36) inductively coupled to it with which a capacitor (37) is arranged in parallel for limiting the waverange comprising the higher frequencies. In the case of reception of the waverange comprising the lower frequencies this capacitor (37) is effectively arranged as a padding capacitor in series with the set of plates (34) of the variable capacitor in the oscillator circuit (31) while simultaneously the further coil winding (36) is effectively arranged in series with the coil winding (33) of the oscillator circuit (31) for the purpose of extending the range and a further capacitor (38) is effectively arranged in parallel with the set of plates (34) of a variable capacitor in the oscillator circuit (31), for the purpose of shifting the waverange of higher frequencies to the waverange of lower frequencies.
    Type: Grant
    Filed: April 9, 1987
    Date of Patent: January 31, 1989
    Assignee: U. S. Philips Corporation
    Inventors: Walter Fischer, Christian Suss
  • Patent number: 4710719
    Abstract: Two or more high power rf capacitors are mounted on the surface of a printed circuit board that has been developed, etched, and plated to receive the capacitors and to engage mating spring contact fingers for electrical contact between the tuned circuit and the capacitors on one or both sides of the strip. An extension handle is attached to the strip to permit external insertion of the capacitor assembly into close proximity to the coil in an NMR probe, thereby permitting efficient multinuclear capability in a high power NMR probe.
    Type: Grant
    Filed: January 13, 1986
    Date of Patent: December 1, 1987
    Assignee: Doty Scientific, Inc.
    Inventor: Francis D. Doty
  • Patent number: 4633206
    Abstract: The channel selector shaft of a 70 channel mechanically detented UHF tuner is provided with mechanical stops which prevent the shaft from moving above UHF channel No. 69 so that the upper twenty-four UHF channels are unused. Also, a dial driving arrangement is provided for driving an expanded UHF dial having only 56 channel indicia so that the 56 channel indicia cover substantially the same area on the dial as the 70 channel indicia of prior art arrangements.
    Type: Grant
    Filed: June 24, 1985
    Date of Patent: December 30, 1986
    Assignee: Sarkes Tarzian Licensing Laboratory
    Inventor: Alarico A. Valdettaro
  • Patent number: 4602222
    Abstract: A circuit is provided which is capable of band switching a voltage controlled oscillator (VCO) while maintaining the relative sensitivity of the voltage controlled device and, hence, the control line voltage itself. The circuit includes an array of capacitors, including a pair of capacitors and a voltage variable capacitor (varactor), a switch, and a tuning coil. When the switch is in the open position, the pair of capacitors are connected in parallel with the varactor. When the switch is closed, the pair of capacitors are connected to ground, arraying themselves on opposite sides of the varactor. In this closed position, the overall capacitance of the tuned circuit increased, thus lowering the tuned frequency of the circuit. Since the switched capacitance (i.e., the capacitance which changes the tuned frequency of the circuit) is arrayed on both sides of the varactor, the varactor maintains its relative sensitivity.
    Type: Grant
    Filed: April 19, 1985
    Date of Patent: July 22, 1986
    Assignee: General Electric Company
    Inventor: Stephen R. Wynn
  • Patent number: 4216451
    Abstract: A variable capacitance semiconductor device is provided wherein a plurality of capacitance elements each having a fixed capacitance value are coupled in parallel with each other and at least two insulated gate field effect transistors are provided for each of the plurality of capacitance elements, whereby the total length of the insulated gate field effect transistors is made as long as possible and accordingly the resistance across the transistors when these are turned on becomes small. Each capacitance element may comprise a single semiconductor substrate of one conductivity type, an opposite conductivity type region formed on one surface of the substrate, an insulating layer formed on the opposite conductivity type region and an electrode formed on the insulating layer. The above described at least two insulated gate field effect transistors are formed such that the above described substrate is shared.
    Type: Grant
    Filed: March 10, 1978
    Date of Patent: August 5, 1980
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Itsuro Nishimura, Tsutomu Ohgishi
  • Patent number: 4186360
    Abstract: A digital channel selecting apparatus for selecting a channel among a plurality of channels which are distributed in at least a relatively higher and lower frequency regions, wherein a plurality of capacitance elements are coupled in parallel, each constituting a portion of a tuning circuit, such that each capacitance element is individually coupled to a corresponding switching device which is operable responsive to a digital control signal, whereby the total capacitance value associated with the tuning circuit is varied to achieve channel selection, characterized in that a fixed reactance component, such as a fixed inductance component or a fixed capacitance component commonly coupled to said plurality of capacitance elements for constituting the tuning circuit is selectively switched to a different reactance value in a semifixed manner by means of a switching diode for each of the higher and lower frequency regions.
    Type: Grant
    Filed: February 21, 1978
    Date of Patent: January 29, 1980
    Assignee: Sanyo Electric Co., Ltd.
    Inventor: Tadamasa Ohashi
  • Patent number: 4138654
    Abstract: An electrically tuned filter arrangement including several tuned filters which may alternatively be coupled to the input and output of the filter arrangement so as to provide the arrangement with different tuning ranges. Each tuned filter has a tuning input to which a capacitive impedance is to be connected for establishing the center tuning frequency of the filter. A capacitor bank is provided including plural individual capacitor elements, and means for coupling any selected combination of the capacitor elements to a capacitive impedance output. This capacitive impedance output is switchably connectable to the tuning inputs of any of the tuned filters.
    Type: Grant
    Filed: September 12, 1977
    Date of Patent: February 6, 1979
    Assignee: Harris Corporation
    Inventor: Gabriel J. Luhowy
  • Patent number: 4056796
    Abstract: A UHF television tuner utilizes a mechanical fine tuning mechanism that alters the operation frequency of the oscillator of the tuner independently of the position of the main tuning shaft. The mechanical fine tuning mechanism utilizes a tuning slug disposed inside a tunable coil of the oscillator, and a rotary to linear motion translating mechanism is disposed within the fine tuning shaft for converting a rotational motion of the fine tuning shaft to a linear motion of the slug inside the coil.
    Type: Grant
    Filed: October 20, 1976
    Date of Patent: November 1, 1977
    Assignee: Sarkes Tarzian, Inc.
    Inventor: Alarico A. Valdettaro
  • Patent number: 4009451
    Abstract: To provide the required multiple channels for an aircraft communications system, a crystal controlled reference oscillator includes a tunable circuit for changing the base reference frequency provided by a crystal. The base reference frequency of the crystal controlled reference oscillator is pulled in frequency by changing the capacitance shunting the crystal. Two transistor switches change appropriate capacitors in series with the usual oscillator capacitor to obtain the capacitance values needed to pull the base reference frequency and thereby provide additional reference frequencies. The transistor switches are controlled by pilot actuated controls that operate a sliding display mark over a digital frequency indicator.
    Type: Grant
    Filed: June 12, 1975
    Date of Patent: February 22, 1977
    Assignee: Edo-Aire, a Division of Edo Corporation
    Inventors: Edward B. Moore, Donald P. Ryan