Class 329/369 - Including three or more terminal discrete semiconductor demodulator device

Subclass of Class 329 - Demodulators
Definition: Subject matter in which the AM demodulator utilizes an electrical
No. of patents: 29
Last issue date: 09/20/2011

Number	Title	Issue Date
8022754	Demodulation circuit A demodulation circuit, including: an input terminal (IN) inputting a current amplitude modulated signal; a first transistor (101) connected to the input terminal; a capacitance (105) connected to a control terminal of the first transistor; a diode (	09/20/2011
7855596	Demodulation circuit A modulation ratio enhancement circuit increases the modulation ratio of a current signal which is ASK-modulated with signal data. A branch unit, an average value detection unit, a comparator and a buffer constitute a demodulation unit so that the signal data is dem...	12/21/2010
7839210	Detector of a radio-frequency signal A method and a circuit for detecting a radio-frequency signal, including at least one first MOS transistor with a channel of a first type, having its gate coupled to an input terminal capable of receiving said signal; a circuit for biasing the first transistor, capa...	11/23/2010
7277687	Low power amplitude modulation detector An AM demodulator using totem pole complementary metal oxide semiconductor transistors having a feedback to provide a common gate voltage of approximately half that across the transistors in the totem pole. The AM demodulator used in a hearing assistance device and ...	10/02/2007
7269395	Envelope detection circuit for low power communication systems An envelope detection circuit includes a signal rectifier, first and second capacitors, and first, second and third transistors. The signal rectifier includes an input port coupled to receive a modulated input signal, and an output port. The first capacitor has a fi...	09/11/2007
7257384	Methods and apparatus for detecting the envelope of RF power signals Apparatus for detecting the envelope of an RF signal that comprises an RF transistor operating essentially at a non-linear operating point at the RF frequency range; a DC power supply for feeding the RF transistor; a dummy load for terminating the output of the RF t...	08/14/2007
6980006	High speed envelope detector and method Envelope detector and method for determining whether the level of a differential input signal DPIN−DNIN is above a reference voltage VREF. The differential input signal is converted to a differential current IDP−IDN, the reference voltage is converted...	12/27/2005
6580902	Frequency translation using optimized switch structures Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an ...	06/17/2003
5936462	AM demodulator using limiter amplifier RSSI output as baseband signal An amplitude-modulated carrier signal is demodulated by passage through a limiting amplifier that converts the amplitude-modulated carrier signal to a signal of constant amplitude, and also produces a received signal strength indicator signal. The receive...	08/10/1999
5594384	Enhanced peak detector An enhanced peak detector circuit for the amplitude demodulation of an incoming amplitude modulated signal is provided. In its simplest form, the enhanced peak detector circuit includes a forward biased NPN transistor, a peak detecting segment coupled to ...	01/14/1997
5459434	Detector amplifier for standby system A detector amplifier includes a first stage, a second stage and a low voltage supply. The first stage has a first input for receiving a first input signal, and an output for outputting a first output signal, and amplifies and/or demodulates the first inpu...	10/17/1995
5418449	Device for the detection of power at the output of an electronic circuit The disclosure relates to the servo-control of an electronic circuit that calls for the detection of the power delivered at its output. The disclosed device is essentially constituted by a field-effect transistor with zero bias VDS mounted betw...	05/23/1995
5126683	Detection circuit for amplitude modulated signals A detection circuit of amplitude modulated signals comprises a first bipolar transistor having a base connected to an input terminal, a collector connected to a first voltage source providing a first power voltage and an emitter; a second bipolar transist...	06/30/1992
4985685	Detector circuit including current attenuating circuit and capacitor A detector circuit comprises demodulating means for demodulating an input signal in accordance with a carrier wave applied to the demodulating means, current attenuating means coupled with the demodulating means and for attenuating a signal from the demod...	01/15/1991
4890066	Envelope detector Envelope detector comprising a differential amplifier (A), a full-wave rectifier circuit and a smoothing filter (AF), which differential amplifier (A) converts an input voltage into a pair of current signals in phase opposition and which full-wave rectifi...	12/26/1989
4829204	Mixer having overload protection A mixer is presented which utilizes a diode bridge having a first input signal imposed across two opposite nodes of the diode bridge and having a second input signal imposed across the other two nodes of the diode bridge. A set of variable impedance devic...	05/09/1989
4716316	Full wave, self-detecting differential logarithmic rf amplifier A logarithmic rf amplifier includes a plurality of cascaded stages each including a differential amplifier which performs full-wave rectification of the rf signal and a circuit for providing a video signal representative of the full-wave rectified rf sign...	12/29/1987
4492926	Amplitude modulation detector The amplitude modulation detection device, which is provided with an AM (amplitude modulation) responsive to first and second input signals for maintaining a constant D.C. level output signal, the first signal being the AM signal, and the second signal pr...	01/08/1985
4370620	Efficient high performance envelope detector with controlled decay envelope detection In this controlled decay envelope detector, a capacitor is used to hold the momentary peaks of the input signal. Its only discharge current path is controlled by a circuit which simultaneously monitors the capacitor voltage and the input signal such that ...	01/25/1983
4360866	Linear full wave rectifier and method for providing full wave rectified signals A circuit and method for producing a signal that is nearly a perfect full wave rectified version of an applied alternating signal. The circuit comprises first and second identical non-linear symmetrical rectifiers each having a respective output coupled t...	11/23/1982
4336586	Linear full wave rectifier circuit A circuit and method for producing a signal that is nearly a perfect full wave rectified version of an applied alternating signal. The circuit comprises first and second identical non-linear symmetrical rectifiers each having a respective output coupled t...	06/22/1982
4259641	Linearized detector/rectifier circuit Circuit for use in the rectification and detection of alternating electrical signals. The circuit employs a feedback amplifier in combination with a non-linear rectifier element to provide an output signal which has a linear relationship to the input sign...	03/31/1981
4253118	Synchronous detection system A system is described for synchronously detecting a video signal along a selectable detection axis. The system includes a limiter receiving an input video signal and a phase-locked loop for developing an oscillator signal whose frequency is locked to the ...	02/24/1981
4167650	Stereo signal demodulating circuits A stereo signal demodulating circuit of a switching type is provided with a differential amplifier to obtain difference signals between two output signals from the switching circuit. The difference signals from the differential amplifier are added to the ...	09/11/1979
4158882	Full-wave rectifier circuit A full-wave rectifier circuit useful in a low level envelope type video detector or the like comprises a symmetrical network having a pair of input terminals and an output terminal, the output terminal developing a unidirectional flow of current in respon...	06/19/1979
4143330	Detector circuit A detector circuit comprising a detector element which includes a diode having a high-frequency input terminal which receives a predetermined DC bias voltage, and a parallel circuit constituted by a resistor and a capacitor and connected between the outpu...	03/06/1979
4139738	Multiplex decoder having a distortion-free differential amplifier In a multiplex decoder circuit comprising two pairs of transistor differential circuits driven by switching signals of a 38 kHz subcarrier signal, for separating a stereo composite signal into left and right channel signals, a differential amplifier forme...	02/13/1979
4025802	Capacitance circuit In a capacitance circuit having a capacitance element which exhibits a breakdown characteristic and which generates noises at breakdown, the improvement comprising a constant-voltage element, which has a lower breakdown voltage than the capacitance elemen...	05/24/1977
3965435	Circuit for demodulating an amplitude modulated signal A common emitter differential amplifier is arranged to receive an amplitude modulated high frequency signal and demodulate it. The common emitter differential amplifier has the emitters of two transistors connected together and these emitters are then con...	06/22/1976

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Class 329/369 - Including three or more terminal discrete semiconductor demodulator device