Regulated Patents (Class 331/186)
  • Patent number: 5481229
    Abstract: A temperature compensated crystal oscillator (10), has a crystal oscillator circuit (12), a voltage controlled reactance element (30), a temperature compensation network (50), and a programmable DC-DC converter network (60) having an output (62) connected to the voltage controlled reactance element (30), or the temperature compensation network (50) or both. The DC-DC converter network (60) provides the capability of operating over an extended voltage range, by increasing the supply voltage to a level necessary to operate the voltage controlled reactance element (30). Much of this structure is adapted for use in an integrated circuit, and provides the advantages of minimizing power and current consumption.
    Type: Grant
    Filed: November 29, 1994
    Date of Patent: January 2, 1996
    Assignee: Motorola, Inc.
    Inventors: Lawrence E. Connell, Timothy J. Collins, Anthony F. Keller, Dennis F. Marvin, Michael L. Bushman
  • Patent number: 5442325
    Abstract: The voltage-controlled oscillator (VCO) of the present invention is designed with reduced sensitivity to power supply voltage variations. The VCO includes multiple inverter stages with dc supply inputs tied to a filtered control dc signal, and a disabling circuit for disabling oscillation. The disabling circuit includes a disabling gate connected to the input to said inverter stages and an enabling gate connecting to the output of the inverter stages for enabling transmission of output from the VCO.
    Type: Grant
    Filed: October 8, 1993
    Date of Patent: August 15, 1995
    Assignee: Texas Instruments Incorporated
    Inventor: Patrick W. Bosshart
  • Patent number: 5440277
    Abstract: A novel bias generator circuit for a voltage controlled oscillator is described. The bias generator allows the VCO frequency to be made essentially independent of the supply voltage and temperature.
    Type: Grant
    Filed: September 2, 1994
    Date of Patent: August 8, 1995
    Assignee: International Business Machines Corporation
    Inventors: John F. Ewen, Mehmet Soyuer
  • Patent number: 5359300
    Abstract: A phase locked loop PLL circuitry for use in a radio pager. A power source applies a voltage to a charge pump circuit. A power supply control circuit controls the application of the voltage.
    Type: Grant
    Filed: June 24, 1993
    Date of Patent: October 25, 1994
    Assignee: NEC Corporation
    Inventor: Yoichiro Minami
  • Patent number: 5325074
    Abstract: A microcomputer in which an oscillating circuit provided therein is activated both when the microcomputer is in an activated state and when it is in a disabled state is provided with a changeover circuit for changing over a supply voltage of the oscillating circuit between when the microcomputer is in the activated state and in the disabled state. The changeover circuit supplies to the oscillating circuit a high voltage when the microcomputer is in the activated state and a low voltage when the microcomputer is in the disabled state. As a result, the starting characteristic when the power is turned on is not deteriorated. Further, the power consumption of the oscillating circuit when the microcomputer is in the disabled state is reduced.
    Type: Grant
    Filed: October 29, 1992
    Date of Patent: June 28, 1994
    Assignee: Rohm Co., Ltd.
    Inventor: Yoshiaki Suenaga
  • Patent number: 5311476
    Abstract: There is provided in connection with a semiconductor memory, such as of the pseudostatic RAM, a layout of the circuit components thereof including a method of testing the memory. There is provided an oscillation circuit which is capable of withstanding bumping of the power source voltage (varying) which effects stabilization regarding the operation of the circuits included therewith including a refresh timer circuit. There is also provided for testing a refresh timer circuit and a semiconductor memory which includes a refresh timer circuit. There is further provided for an output buffer which is capable of high speed operation with respect to memory data readout, a voltage generating circuit which is capable of stable operation and a fuse circuit, such as provided in connection with redundant circuitry in the memory and which is characterized as having a configuration of a fuse logic gate circuit employing complementary channel MOSFETs together with a fuse.
    Type: Grant
    Filed: June 18, 1992
    Date of Patent: May 10, 1994
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Takeshi Kajimoto, Yutaka Shimbo, Katsuyuki Sato, Masahiro Ogata, Kanehide Kenmizaki, Shouji Kubono, Nobuo Kato, Kiichi Manita, Michitaro Kanamitsu
  • Patent number: 5302921
    Abstract: A piezoelectric oscillator in which radiation of higher harmonic components is reduced. A piezoelectric vibrator and a semiconductor device are provided in an oscillation circuit for making the piezoelectric vibrator oscillate, as is a filter for cutting components in a predetermined frequency band or higher harmonic components of an oscillation signal outputted from the semiconductor device. The piezoelectric vibrator, the semiconductor device and the filter are packed in one package. Radiation of the higher harmonic components is reduced by placing the filter close to the oscillator, by providing a shielding or by operating portions of the oscillator output circuit with a reduced supply voltage.
    Type: Grant
    Filed: April 16, 1992
    Date of Patent: April 12, 1994
    Assignee: Seiko Epson Corporation
    Inventors: Mikio Shigemori, Toru Oida, Shigeru Hirasawa, Katsumi Yamamura
  • Patent number: 5212460
    Abstract: A crystal oscillation circuit has a constant-current load type inverter circuit receiving a regulated supply voltage from a voltage regulating circuit and functioning as an inverting amplifier for oscillation; a feedback circuit connected between an input and an output terminal of the inverter circuit and including a resistor and capacitors; and a crystal resonator connected between the input and output terminals of the inverter circuit. The inverter circuit is formed by a constant-current source and a P-channel type MOS-FET or an N-channel type MOS-FET. As the supply voltage from the voltage regulating circuit necessary as an oscillation starting voltage can be set at a low level, the current consumption of the overall oscillation circuit can be effectively reduced.
    Type: Grant
    Filed: January 10, 1992
    Date of Patent: May 18, 1993
    Assignee: NEC Coporation
    Inventor: Akio Tamagawa
  • Patent number: 5202647
    Abstract: An apparatus for generating clock pulses comprises a Colpitts-type quartz crystal oscillator having an inverter composed of a C-MOS integrated circuit, and a quartz-crystal resonator connected with said inverter, and an amplifying circuit for amplifying the output of said quartz-crystal oscillator and delivering clock pulses as output. A first resistor is provided between the input terminal of the inverter and the quartz-crystal resonator, and the input terminal of the inverter is connected with the input terminal of the amplifying circuit. The amplifying circuit is for connection with a load composed of TTL circuits. This amplifying circuit includes a capacitor for suppressing a direct-current bias voltage from the output of the oscillator, an inverter composed of a C-MOS integrated circuit for providing the clock pulses as output, and a negative feedback circuit which utilizes negative feedback to the inverter as a direct-current bias voltage corresponding to the duty ratio of the clock pulses.
    Type: Grant
    Filed: March 11, 1992
    Date of Patent: April 13, 1993
    Assignee: Kyocera Corporation
    Inventors: Yoichi Muraki, Setsuo Hori
  • Patent number: 5180995
    Abstract: An improved ring oscillator is disclosed which can be formed in a semiconductor substrate. The ring oscillator includes inverters cascaded in a ring-like manner, and a diffused resistor R1 having a positive temperature coefficient and a polysilicon resistor R2 having a negative temperature coefficient for determining bias currents supplied to the inverters. The oscillation frequency tends to decrease with a rise of ambient temperature based on a temperature characteristic of diffused resistor R1 and a temperature characteristic of the oscillator circuit itself; however, the change of oscillation frequency is compensated by a temperature characteristic of polysilicon resistor R2. Therefore, a reference clock signal generating circuit having an oscillation frequency which is not affected by change of the ambient temperature can be formed in the semiconductor substrate.
    Type: Grant
    Filed: January 24, 1992
    Date of Patent: January 19, 1993
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Isamu Hayashi, Harufusa Kondoh
  • Patent number: 5180992
    Abstract: A PLL frequency synthesizer includes a reset circuit which determines whether or not an oscillator starts to normally generate an oscillation signal in response to a power save signal which intermittently operates the oscillator in a standby mode and which outputs a reset signal to a prescaler when it is determined that the oscillator normally generates the oscillation signal. A hold circuit prevents a frequency-divided signal being output from the prescaler to a programmable counter and an initial phase detection circuit until the prescaler is reset to an initial state in response to the reset signal and starts to normally generate the frequency-divided signal.
    Type: Grant
    Filed: October 17, 1991
    Date of Patent: January 19, 1993
    Assignee: Fujitsu Limited
    Inventors: Takehiro Akiyama, Kazumi Ogawa
  • Patent number: 5179358
    Abstract: An electronic circuit (100) includes a load stage circuit (116) having at least one FET (118 and 120). The load stage circuit (116) includes an adjustment terminal responsive to an adjustment voltage for controlling the load resistance of the FET (118 and 120). The electronic circuit (100) also includes a bias current generator (124) for generating a bias current. A current steering circuit (122) controls the amount of bias current supplied to the load stage circuit (116). The electronic circuit (100) also includes a plurality of output terminals (112 and 114) for providing an output which is responsive to voltages applied at input terminals (104, 106 and 108) of the current steering circuit (122). Circuit (100) alllows for the adjustment of the bias current to the circuit in order to achieve optimum power dissipation over changing operating conditions.
    Type: Grant
    Filed: March 4, 1992
    Date of Patent: January 12, 1993
    Assignee: Motorola, Inc.
    Inventor: Frederick L. Martin
  • Patent number: 5175512
    Abstract: A high speed voltage controlled oscillator (VCO) providing for low sensitivity to the noise on the integrated circuit's (IC) power supply. The VCO circuit creates a supply voltage for a ring oscillator independent of the IC's power supply thereby controlling the frequency of operation independent of variations on the IC's power supply. A high speed CMOS level shifting circuit provides for converting outputs of the VCO with low logic level and varying frequencies to a signal with a full CMOS logic level and low duty cycle distortion.
    Type: Grant
    Filed: February 28, 1992
    Date of Patent: December 29, 1992
    Assignee: Avasem Corporation
    Inventor: Paul W. Self
  • Patent number: 5172078
    Abstract: An oscillator circuit uses a differential oscillator and differential amplifier to generate a symmetrical single-ended output signal. The differential oscillator generates a differential oscillator signal having an adjustable zero-crossing point in response to a control signal. The differential amplifier converts the differential oscillator signal to the symmetrical single-ended output signal having a symmetrical waveform. Controlling the zero-crossing of the differential oscillator signal compensates for common mode variation in the differential amplifier and produces a single-ended output signal having a symmetrical waveform with 50% duty cycle. A matching amplifier operating in a self biasing mode produces the control signal.
    Type: Grant
    Filed: February 6, 1992
    Date of Patent: December 15, 1992
    Assignee: Motorola, Inc.
    Inventor: Dejan Mijuskovic
  • Patent number: 5140286
    Abstract: A voltage controlled oscillator and buffer amplifier circuit (211) is disclosed. The circuit is in a stacked configuration, whereby, the current from the power supply (361) is used by the buffer amplifier circuit and reused by the VCO circuit. The VCO circuit includes two transistors (333, 325). The transistors are set-up in a mirrored configuration, so that one of the transistors (325) controls the bias current in the other transistor (333). Both of the transistors are integrated into a semiconductor circuit die (365), thus, matching the thermal characteristics of the transistors (333, 325) and improving control of the bias current. The die (365) is bonded to a ceramic substrate (601). The substrate (601) has connectivity paths for connecting components in the circuit die to components external to the circuit die. Some of the connectivity paths are made of a material and length to form passive circuit elements.
    Type: Grant
    Filed: August 2, 1991
    Date of Patent: August 18, 1992
    Assignee: Motorola, Inc.
    Inventors: Gregory R. Black, Alexander W. Hietala, Darioush Agahi-Kesheh
  • Patent number: 5126695
    Abstract: A semiconductor integrated circuit device comprises a first oscillator circuit driven by a first voltage for generating a first clock signal employed as the internal system clock signal for an internal circuit in the integrated circuit device and a second oscillator circuit driven by a second voltage lower than said first voltage for generating a second clock signal. A voltage boost circuit generates a stepped up voltage based on the second clock signal, which stepped up voltage is higher than the first voltage and is supplied to the first oscillator circuit and the internal circuit as their circuit source voltage.
    Type: Grant
    Filed: March 1, 1991
    Date of Patent: June 30, 1992
    Assignee: Seiko Epson Corporation
    Inventor: Sachiyuki Abe
  • Patent number: 4884043
    Abstract: A high-frequency generator 1 includes a multigrid electron tube (2). A current source circuit (10) is connected to the control grid (3) or the screen grid (4) of the electron tube (2) and is arranged as an optionally adjustable current source which is also coupled to the main current path of the electron tube. This circuit defines the grid dissipation and also extends the useful life of the electron tube. If the current source circuit (10) is connected to the screen grid (4), the electron tube is further safeguarded in a simple manner against an inadmissibly high screen grid current accompanying an occasional anode voltage drop.
    Type: Grant
    Filed: July 12, 1988
    Date of Patent: November 28, 1989
    Assignee: U.S. Philips Corporation
    Inventors: Christian S. A. E. Patron, Eugene J. Sowinski, Aart P. Huben
  • Patent number: 4783620
    Abstract: A constant voltage circuit comprises a capacitor connected between one end of a MOS transistor controlled by an operation-stop control signal and an output terminal of an inverter for inverting the operation-stop control signal. When, in the circuit having this arrangement, the transistor for operation-stop control is turned off and the hold mode is ended, the potential at one end of the transistor is quickly lowered to the ground potential. The result is to quicken the start of operation of the constant voltage circuit and hence the rise of the constant voltage output.
    Type: Grant
    Filed: July 8, 1987
    Date of Patent: November 8, 1988
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Nobutaka Kitagawa, Akihiro Sueda, Takesi Suyama
  • Patent number: 4714901
    Abstract: A temperature compensated complementary metal-insulator-semiconductor oscillator receives a temperature independent reference voltage from an external source. The temperature independent reference voltage is attenuated and summed with a threshold voltage in order to bias a gate electrode of MOSFET. A bipolar p-n junction diode is connected to the MOSFET at a source electrode in order to bias the MOSFET with a temperature dependent forward voltage drop to compensate for temperature variations therein. The MOSFET controls a temperature independent current. A current mirror assembly receives the current and controls a Schmitt trigger oscillator. The Schmitt trigger oscillator generates a signal having a temperature independent constant period.
    Type: Grant
    Filed: October 15, 1985
    Date of Patent: December 22, 1987
    Assignee: Gould Inc.
    Inventors: Babu L. Jain, Pardeep K. Jain, Michael S. Briner
  • Patent number: 4631496
    Abstract: A frequency synthesized transceiver capable of tuning to a plurality of communication channels is disclosed. The transceiver includes a receiver and a transmitter section which are coupled to the synthesizer which generates the appropriate injection signals to achieve tuning. A battery saving circuit generates a battery saving signal having a predetermined duty cycle and period and is responsive to the phase detector in the synthesizer to disrupt power to the synthesizer while maintaining precise tuning. The battery saver circuit is also responsive to the transceiver. In a normal receive operation, a battery saving circuit synchronizes its battery saving signal with the hold condition of the phase detector to disrupt power to selected modules in the synthesizer without altering the injection frequency of the receiver. In a standby mode, power is disrupted to all modules in the receiver, the selected modules in the phase locked loop and the voltage controlled oscillator.
    Type: Grant
    Filed: December 13, 1985
    Date of Patent: December 23, 1986
    Assignee: Motorola, Inc.
    Inventors: Jaime A. Borras, Jose I. Suarez
  • Patent number: 4628284
    Abstract: A push-pull current-fed parallel resonant oscillator includes a parallel resonant LC tank circuit with one end coupled to one terminal of a DC current source via a serially connected first diode and first switching transistor and the other end of the tank circuit coupled to said one terminal via a serially connected second diode and second switching transistor. Respective capacitors (17, 21) shunt the series connections. The tank circuit inductor includes the primary of a transformer whose secondary is part of the transistor drive circuit. The circuit parameters are chosen to provide a duty cycle less than 50% and a high voltage gain of the AC tank voltage. The transistors are controlled to delay the turn-off time of the on-transistor thereby allowing a negative voltage to develop on the opposite capacitor which in turn delays turn-off of its parallel connected transistor so as to provide a dead-time (.DELTA.t.sub.2) during the switching interval in which both transistors are simultaneously off.
    Type: Grant
    Filed: June 3, 1985
    Date of Patent: December 9, 1986
    Assignee: North American Philips Corporation
    Inventors: Gert W. Bruning, Mark W. Fellows
  • Patent number: 4618837
    Abstract: A reference pulse generator comprises a quartz crystal oscillator, a frequency divider connected to the oscillator for frequency dividing the oscillator output, and a constant current generator connected in series both with the oscillator and the frequency divider to control the current applied to the oscillator from a power source. The constant current generator comprises a current limiting element, such as a MOSFET, which is controlled by a reference voltage produced by a reference voltage generator.
    Type: Grant
    Filed: June 29, 1982
    Date of Patent: October 21, 1986
    Assignee: Kabushiki Kaisha Daini Seikosha
    Inventor: Yoshiaki Matsuura
  • Patent number: 4593256
    Abstract: A low power, wide bandwidth oscillator capable of oscillating at frequencies of greater than 350 MHz and capable of being implemented in relatively few parts is disclosed. A switching section controls the resonant frequency of a resonator and is connected in DC series with an amplifier. A regulator-buffer section simultaneously serves as a voltage regulator and RF signal buffer.
    Type: Grant
    Filed: June 28, 1984
    Date of Patent: June 3, 1986
    Assignee: Motorola, Inc.
    Inventor: Robert H. Bickley
  • Patent number: 4574801
    Abstract: An electrosurgical unit having feedforward power regulation. In one embodiment there is an amplifier which produces a pulse modulated electrosurgical output signal. A microprocessor calculates an adjusted pulse width (duty cycle) just sufficient to account for the power changes due to voltage fluctuations. The microprocessor controls the pulse width of the gate voltage of a power transistor in the amplifier to regulate the amplifier output. In another embodiment the supply voltage is fed into the base drive circuitry of an amplifier power transistor through the photo-resistor side of an optoisolator. The lamp brightness of the optoisolator and thus the gain of the base drive circuitry is adjusted by the amplifier power level control. The nonlinearity of the optoisolator complements the nonlinearity of the amplifier so that the net gain in the amplifier drive at any power setting is just sufficient to account for the voltage fluctuation.
    Type: Grant
    Filed: February 29, 1984
    Date of Patent: March 11, 1986
    Assignee: Aspen Laboratories, Inc.
    Inventor: Michael R. Manes
  • Patent number: 4547749
    Abstract: An oscillator with inverter and delay stages is coupled between first and second reference terminals. In one aspect a depletion transistor is connected between a power supply terminal and the first reference terminal to provide a reference voltage thereat. In another aspect the delay stages each have a control terminal for controlling the delay thereof. A temperature compensation circuit has a control transistor which provides a voltage to the control terminals of the delay stages which is inversely proportional to the threshold voltage of the control transistor.
    Type: Grant
    Filed: December 29, 1983
    Date of Patent: October 15, 1985
    Assignee: Motorola, Inc.
    Inventor: Clinton C. K. Kuo
  • Patent number: 4255721
    Abstract: A high stability integratable resistance-capacitance oscillator is disclosed which is capable of operating at a stable frequency regardless of changes in ambient temperature or applied voltages. The oscillator uses a temperature compensating impedance and semiconductor junction to compensate for temperature dependent variations in active elements of the oscillator. Constant current bias sources and voltage clamping circuits insure oscillations having predetermined amplitude ranges despite changes in applied voltages. Active transistors in the oscillator are maintained in their linear range by the use of antisaturation transistors connected between their base and collector electrodes.
    Type: Grant
    Filed: December 29, 1978
    Date of Patent: March 10, 1981
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Thomas G. Wilson, Jr.
  • Patent number: 4243954
    Abstract: A local oscillator suitable for integrated circuit construction in a radio receiver maintains low level voltage oscillations across a tank circuit which may include a varactor diode. An emitter-coupled pair of transistors with a small switch-over voltage has the collector of the second transistor connected to the base of the first. Third and fourth matching transistors have emitters connected to the bases of the second and first transistors, respectively, and grounded collectors. The base of the third transistor is connected through a diode to ground; while the base of the fourth transistor is connected through a matching diode and the tank circuit to ground. A source of electric power having a voltage greater than two diode drops above ground is effective to supply current through resistors to the bases of the first and second transistors.
    Type: Grant
    Filed: June 19, 1979
    Date of Patent: January 6, 1981
    Assignee: General Motors Corporation
    Inventors: Burtron D. Schertz, Frederick A. Aldridge
  • Patent number: 4232261
    Abstract: A circuit arrangement includes a MOS field effect transistor as a variable resistance in series with a load such as an integrated circuit across a power supply with means for controlling the variable resistance to establish a very constant supply or input voltage to the load. A switch may be included to apply a constant supply or input voltage of different known values to a load such as an oscillator requiring different voltages at different stages of operation.
    Type: Grant
    Filed: January 30, 1978
    Date of Patent: November 4, 1980
    Assignee: Eurosil GmbH
    Inventors: Ernst Lingstaedt, Gerhard Moegen, Gottfried Wotruba
  • Patent number: 4218661
    Abstract: An oscillator circuit wherein the impedance at the output terminal can be selectively decreased for a short period of time to thereby increase the closed loop gain is provided. The oscillator circuit includes a quartz crystal vibrator and a C-MOS inverter having a drain output terminal for producing a high frequency signal thereat, the gate output terminal being fed back through the quartz crystal vibrator to a gate input terminal to define a predetermined closed loop gain. The invention is particularly characterized by a control circuit external to the oscillator circuit that is adapted to produce a control signal for a predetermined period of time.
    Type: Grant
    Filed: November 22, 1977
    Date of Patent: August 19, 1980
    Assignee: Kabushiki Kaisha Suwa Seikosha
    Inventor: Yoichi Imamura
  • Patent number: 4205210
    Abstract: An apparatus for applying pressure and a high frequency electric field to material, comprising a cavity for containing the electric field which encloses platens relatively movable to apply pressure to material placed between the platens. The cavity electrically communicates with the platens for supplying the contained electric field to the platens which, in turn, cooperate with each other to apply the field to the material between the platens. The cavity and the platens are also directly coupled into the means for generating the electric field as a resonant circuit. The apparatus includes a triode tube having means for preventing excessive current therethrough as voltage is first applied, and means for operating the triode under optimum conditions utilizing an automatically variable capacitor to maintain a predetermined grid current for a workpiece placed within the apparatus after full voltage has been applied.
    Type: Grant
    Filed: January 4, 1978
    Date of Patent: May 27, 1980
    Assignee: USM Corporation
    Inventors: Malcolm Salway-Waller, Frederick H. Langton
  • Patent number: 4152675
    Abstract: A crystal oscillator is provided a portion of which is fabricated in monolithic integrated circuit form. The circuit is temperature-compensated and utilizes a single 5 volt DC power supply compatible with NMOS and TTL voltage levels. The duty cycle of the oscillator may be varied between approximately 30 and 70 percent.
    Type: Grant
    Filed: April 3, 1978
    Date of Patent: May 1, 1979
    Assignee: Motorola, Inc.
    Inventor: William B. Jett, Jr.
  • Patent number: 4136315
    Abstract: A low frequency modulating signal and a high frequency carrier signal circuit employing a twin-T oscillator having an integrated circuit operational amplifier for producing the modulating signal and an L-C resonant feedback oscillator having a transistor amplifier for producing the carrier signal, and a monitoring shunt regulator for supplying a reference potential to the twin-T oscillator and biasing and operating potentials to the L-C resonant feedback oscillator and for deactivating the L-C resonant feedback oscillator when an increase in resistance occurs in the shunt regulator.
    Type: Grant
    Filed: July 27, 1977
    Date of Patent: January 23, 1979
    Assignee: Westinghouse Air Brake Company
    Inventor: John J. Kuhn
  • Patent number: 4128816
    Abstract: An electronic circuit which has a constant voltage circuit comprises a reference voltage generating circuit, a voltage controlled element receiving the signals from said reference voltage generating circuit which is composed of a plurality of MOS transistors, and a load circuit receiving said constant voltage circuit.
    Type: Grant
    Filed: July 18, 1977
    Date of Patent: December 5, 1978
    Assignee: Kabushiki Kaisha Daini Seikosha
    Inventor: Nobuo Shimotsuma
  • Patent number: 4068189
    Abstract: A linear oscillator circuit has a resonant circuit which develops an oscillating voltage V.sub.R having an amplitude proportional to a distance between a conducting body and the resonant circuit located within a probe. A control power drive circuit coupled to the output of the resonant circuit switches a current through the resonant circuit during each period of oscillation of the voltage V.sub.R. A reference current source is coupled to the control power drive circuit for drawing a current through the control power drive circuit and the resonant circuit. The magnitude of the current is equal to the magnitude of an independently established reference current. A detector circuit responsive to the value of the amplitude of oscillation may be provided to indicate the distance of the conductive body from the resonant circuit-containing probe.
    Type: Grant
    Filed: October 7, 1976
    Date of Patent: January 10, 1978
    Assignee: Electro Corporation
    Inventor: Michael A. Wilson
  • Patent number: 4065733
    Abstract: A blocking oscillator for driving the armature of a buzzer comprises a transistor which is stabilized against changes in ambient temperature and fluctuations of a supply voltage. A core is provided for magnetically driving the armature, and carries thereon a drive coil which induces a regularly varying electromagnetic field therein as well as a control coil which is connected in feedback relationship with the drive coil. The drive coil forms together with the collector emitter path of the transistor a series circuit, which is connected with a power supply and which is shunted by another series circuit comprising a resistor, the control coil and a diode and which is also connected across the power supply. The base of the transistor is connected with the junction between the resistor and the control coil. The control coil is shunted by a forwardly poled diode.
    Type: Grant
    Filed: February 17, 1977
    Date of Patent: December 27, 1977
    Assignee: Star Seimitsu Kabushika Kaisha
    Inventors: Youjiro Shigemori, Yoshio Mitumori
  • Patent number: 4065728
    Abstract: An improved integrated circuit oscillator adapted for crystal-controlled applications eliminates the need for capacitors and duty cycle control circuitry by using a cascaded pair of push-pull complementary transistor amplifier stages, a clipping-type automatic amplitude control circuit, and a resonant feed back path between the two amplifier stages. In an illustrative embodiment, floating bias voltages are established by a chain of diodes, with several bias currents set with respect to the chain current by emitter area relationships. Square-wave output is provided by a flip-flop connected to push-up and pull-down output circuits.
    Type: Grant
    Filed: December 13, 1976
    Date of Patent: December 27, 1977
    Assignee: Bell Telephone Laboratories
    Inventor: Veikko Reynold Saari
  • Patent number: 4054848
    Abstract: An ultrasonic oscillator, which can be mounted on a vehicle and which enables an oscillating element itself to generate a high ultrasonic energy, comprising a storage battery having one power line thereof grounded, a DC -- DC converter which is electrically isolated from said power lines of the storage battery and which supplies D.C. power to non-grounded power lines thereof, and a Darlington transistor circuit having a ultrasonic oscillating element connected across base and collector thereof.
    Type: Grant
    Filed: March 17, 1977
    Date of Patent: October 18, 1977
    Assignee: Nippon Soken, Inc.
    Inventor: Sigeyuki Akita
  • Patent number: 4047127
    Abstract: An RF oscillator and modulator produces a stable moudlated RF signal with a varying voltage source and without the requirement for critical device selection. A bias voltage for the oscillator transistor is provided by diode means at the oscillator output, the bias voltage being commuted to the transistor through the oscillator tuned circuit. Advantageously, the diode means biases a diode modulator connected to the oscillator output and to a modulation signal whereby linear operation of the diode modulator is enhanced.
    Type: Grant
    Filed: August 27, 1976
    Date of Patent: September 6, 1977
    Assignee: Fairchild Camera and Instrument Corporation
    Inventor: Wilson E. Alexander
  • Patent number: 4031456
    Abstract: A constant-current circuit has a depletion type FET and a series circuit consisting of an impedance element and an enhancement type FET connected in parallel between two terminals. The gate electrodes of the respective FET's are connected to a juncture between the impedance element and the enhancement type FET, and current which flows through the depletion type FET is set to be sufficiently larger than a current which flows through the series circuit. The voltage across the enhancement type FET is made substantially equal to a threshold voltage thereof, whereby the constant current characteristics of such constant-current circuits are checked from being dispersed.
    Type: Grant
    Filed: August 28, 1975
    Date of Patent: June 21, 1977
    Assignee: Hitachi, Ltd.
    Inventors: Shunji Shimada, Yoshikazu Hatsukano, Osamu Yamashiro
  • Patent number: 4015218
    Abstract: Temperature-compensated solid-state oscillators. A temperature sensitive voltage regulator provides to the oscillator a supply voltage which varies in accordance with a temperature-dependent voltage across a diode junction in the oscillator timing circuit. The oscillator frequency thereby remains substantially constant over a wide range of ambient temperatures and input voltages.
    Type: Grant
    Filed: April 10, 1975
    Date of Patent: March 29, 1977
    Assignee: Inventronics, Inc.
    Inventor: Albert E. Sanderson
  • Patent number: 4012701
    Abstract: A Hartley oscillator includes a basic Hartley oscillation circuit having a semiconductor active element, a tank circuit coupled to the active element and having a grounded end, a coupling capacitor connected between the other end of the tank circuit and a control electrode of the active element. A constant direct current source for supplying a constant direct current to an electric current supply terminal of the active element is further provided. A feedback circuit is coupled to the active element and the output of the constant direct current source and adapted to cause a variation of a direct current potential on the current supply terminal of the active element to be fed back to the control electrode of the active element, and a capacitor having a grounded end and the other end connected to the output of the constant current source is further provided in the Hartley oscillator.
    Type: Grant
    Filed: March 2, 1976
    Date of Patent: March 15, 1977
    Assignee: Tokyo Shibaura Electric Co., Ltd.
    Inventors: Takashi Sugimoto, Kazumasa Noyori
  • Patent number: 4009454
    Abstract: This disclosure relates to a fail-safe constant amplitude signal generator including a shunt regulator for supplying d.c. operating potential to a free-running transistor oscillator as well as for controlling the quality factor of a resonant tuned circuit and, in turn, the oscillator so that an a.c. output signal is capable of being produced with a known amplitude which cannot be changed by any critical circuit or component failure.
    Type: Grant
    Filed: June 26, 1975
    Date of Patent: February 22, 1977
    Assignee: Westinghouse Air Brake Company
    Inventor: John O. G. Darrow
  • Patent number: 4001727
    Abstract: Control of the gate electrode of a magnetic-beam-triode oscillator is effected by a diode connected between the gate and a controllable shunt regulator. The regulator is varied by a voltage derived from a differential amplifier forming part of a closed loop feedback circuit including the oscillator. By introducing an additional differential amplifier, variation of the regulator may also be made to depend on one of several parameters of the oscillator and load circuit, for example on the r.f. tank circuit voltage.
    Type: Grant
    Filed: November 7, 1975
    Date of Patent: January 4, 1977
    Assignee: International Standard Electric Corporation
    Inventors: Barrington George Kennett, Adrian Ernest Miller
  • Patent number: 4001718
    Abstract: A proximity sensor oscillator, having a resonant circuit in which the power loss is inversely related to the distance of a conductive body from a probe containing a part of the resonant circuit, produces an oscillating output signal in the resonant circuit with a peak amplitude that varies with power loss and distance. A power source provides either the current or the voltage component of electrical power at a substantially constant value independent of changes of resonant circuit power loss and is periodically switched to the resonant circuit to provide an average input power thereto. The power loss of the resonant circuit loads the source, and thus the other component of power oscillates within the resonant circuit at a peak amplitude linearly related to the inverse of the power loss.
    Type: Grant
    Filed: May 12, 1975
    Date of Patent: January 4, 1977
    Assignee: Electro Corporation
    Inventors: Michael A. Wilson, Gordon E. Gee, Fred J. Momparler
  • Patent number: 3935542
    Abstract: A contactless proximity sensor includes an oscillator which generates an output damped by the presence of a metal part whose approach is to be detected. The operating voltage for the oscillator is developed across a capacitor, in parallel with a Zener diode, whose charging circuit includes a high-ohmic resistance connected in series therewith across a supply of pulsating direct current. The flow of charging current into the capacitor is controlled by a thyristor adapted to be fired by means of a trigger transistor upon a critical reduction in the amplitude of the oscillator output. The trigger transistor, upon conducting, lowers the cathode potential of the thyristor whose gate is connected, via a resistor and/or a diode, to the junction of the capacitor with its charging resistance; in one embodiment this gate is driven positive through an inverter upon the conduction of the trigger transistor.
    Type: Grant
    Filed: January 22, 1973
    Date of Patent: January 27, 1976
    Inventor: Robert Buck