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7256920 Electro-optic modulator  
A modulator circuit ( 28 ) for directing a voltage across a modulator element ( 26 ) to modulate a beam ( 20 ) includes a first inductor L 1 that is electrically connected in parallel to the...
6621879 Digital radio system, a digital radio device, and a quadrature demodulator  
A digital radio device having a quadrature demodulator that does not suffer from substantial amplitude roll-off at the relevant operating range. Such a device is obtained by a phase shifting...
6335659 Demodulator circuits  
A frequency modulated signal demodulator circuit includes a phase shift element and a time delay element which operate on an input signal (V_IF). The phase shift element and the time delay element...
6020784 FM demodulation circuit  
An FM demodulation circuit includes a phase conversion circuit which converts a frequency variation of an input signal into a phase variation and has a variable conversion characteristic, and a...
5929716 High performance voltage controlled oscillator that is cost efficient  
A high-performance voltage controlled oscillator without use of variable capacitance (varicap) diodes which is easy in fabrication in an semiconductor IC form. The voltage controlled oscillator...
5793251 Demodulator circuit using gyrator circuit  
A demodulator circuit includes a gyrator circuit forming a derived equivalent inductance which is used in a demodulating circuit. The gyrator circuit has a first operational transconductance...
5596298 Bus aligned quadrature FM detector  
In a quadrature FM detector, demodulation is performed by a product detector which multiplies an amplitude limited FM modulated information signal by a version of the amplitude limited FM modulated...
5572164 FM demodulator with threshold extension and receiver comprising such an FM demodulator  
An FM demodulator having two input terminals (11, 12), to which FM input signals having 90° phase relation are applied, the said FM demodulator including a phase comparator (1) and a tunable,...
5453714 Binary FM demodulator with self-adjusting resonant operating frequency according to demodulated binary output signal duty cycle  
A demodulator for demodulating a binary frequency-modulated signal includes a demodulator with a quadrature tank circuit and a duty cycle monitor circuit. The quadrature tank circuit has a...
5450033 Frequency demodulation circuit  
A frequency demodulation circuit having an improved detection sensitivity is provided by forming an all-pass equalizer in a Quadrature-type demodulator capable of allowing a band covering at least...
5428404 Apparatus for method for selectively demodulating and remodulating alternate channels of a television broadcast  
An apparatus and method for demodulating and remodulating a transmitted signal prior to presentation to a television receiver, the transmitted signal comprising a video signal, a first channel...
5414385 Dual mode FM quadrature detector  
A dual mode quadrature detector (15) uses the same components for both narrow band and wide band operation and provides an output amplitude which is independent of the mode of operation selected. A...
5341107 FM quadrature demodulator with two phase comparison circuits  
FM quadrature demodulator having in-phase and quadrature terminals for applying a pair of FM-modulated signals in a mutual phase quadrature thereto, having a modulation signal which is...
5333151 High speed frequency-shift keying decoder  
A frequency-shift keying (FSK) signal detector splits an FSK signal into two paths. In one path, a phase-altering circuit having a variable frequency characteristic between the two encoding...
5293135 FM demodulator with self-tuning quadrature detector  
A quadrature detector FM demodulates an intercarrier signal operating at an unknown frequency. An LC tank circuit develops a 90° phase shift across inputs of a multiplier. The output signal of the...
5204635 Digital FM demodulator utilizing uncorrelated clock reference signals  
An FM demodulator which generates a modulated object signal directly in digital form, wherein an input FM signal is phase detected, then converted to digital form, then quantized into a pulse...
5166633 Angle modulation dectector  
An angle modulation detector which prevents a demodulated output from being influenced by fluctuations in the amplitudes of signals generated from angle-modulated signal sources such as a...
5136254 FM demodulator circuit whose demodulation output is decreased in distortion  
A differential amplifier amplifies an FM signal supplied from an FM signal source. A phase shift circuit shifts a phase of a carrier signal included in an FM signal output from the differential...
5053717 FSK demodulator  
An improved multilevel FSK demodulator, according to the invention, is provided that down-converts the IF frequency back to baseband quadrature via dual mixers. The improved multilevel FSK...
5015961 Frequency shift demodulator  
The invention improves the ability of the FS demodulator-circuit of an FS digital transmission system so as to withstand noise with low error count. The invention uses two different types of all...
4926132 FM detector with reduced distortion  
An FM detection circuit utilizes a first multiplier and phase shift circuit to demodulate an FM signal. The output signal also contains harmonic distortion as a result of the demodulation process....
4618829 Bridge circuit demodulator  
A bridge circuit demodulator for frequency-modulated signals includes a parallel resonant circuit tuned to the carrier frequency of the FM signals. The resonant circuit includes the secondary...
4616186 FM quadrature demodulator with distortion compensation  
A circuit for reducing the distortion in an FM quadrature demodulator. A non-linear circuit stage is connected after the quadrature demodulator, whose characteristic has an inverse curve form like...
4612510 FM demodulator using combined outputs of plural FM detectors  
An FM detection apparatus comprising a frequency dividing means, having a division ratio N, arranged to receive an incoming radio frequency (RF) signal carrying frequency modulation and to...
4608538 FM quadrature detector with ferrite bead tuned circuit  
A quadrature detector circuit for demodulating frequency modulated information is provided that is particularly designed for use in television receive only (TVRO) satellite communication video...
4608539 FM detector with injection locked divider input circuit  
A frequency modulation detection arrangement comprises an FM detector and an injection-locked frequency divider arranged for receiving a radio signal and for providing a frequency divided radio...
4603302 Frequency modulation detectors  
An FM detector comprises a frequency divider arranged to frequency divide an input FM signal and a phase sensitive detector coupled to the frequency divider. The detector receives a first frequency...
4560943 F.M. demodulator with fail-safe features  
An F.M. demodulator of the phase quadrature type is adapted for fail-safe operation and in particular for use in a railway signalling system. A Bessel band-pass filter is chosen for the design...
4535296 FM-Demodulator with ladder filter delay line and multiplier  
For demodulating an FM-carrier which is, for example, modulated by a video signal and two sound subcarriers, a Gilbert mulitplier (13) and a phase shifting circuit (12) are used. The phase shifting...
4490680 Integrable quadrature FM demodulator using fewer signal pins  
A quadrature type FM demodulator device used, for example, in a television receiver, includes a band pass filter for filtering a sound intermediate frequency (SIF) signal input to the device. The...
4463317 FM demodulator with regulation of the output D.C. component  
A frequency modulation detector, includes an FM (frequency modulation) demodulator, an adder responsive to first and second signals for maintaining a constant D.C. level output signal, the first...
4441079 Multiple bandwidth FM demodulator  
A multiple bandwidth quadrature type FM demodulator employs a double-balanced mixer supplied with a frequency modulated IF signal directly and through one of a selectable plurality of bandpass...
4426622 Frequency discriminator  
A new type of frequency discriminator in which the signal is applied to a ir of channels, one of which includes a frequency pass circuit which may comprise a parallel resonant circuit, and the...
4390845 Gated quadrature detector biased to switch on sinusoidal zero crossings  
A quadrature detector includes a driving circuit for applying a frequency modulated square-wave to one input of a gating circuit and to the input of a phase-shift network whose output is connected...
4375618 Linearized FM quadrature detector  
In an FM receiver a multiplier is driven from the IF limiter. The limiter also drives a single tuned circuit which produces a quadrature signal that drives a second port in the multiplier. When the...
4362998 FM Detector using a phase shift network and an analog multiplier  
An FM detector is constructed of a phase shift network and an analog multiplier. The analog multiplier includes a differential amplifier circuit and a phase detector circuit. The differential...
4359694 FM Demodulator for a plurality of carrier frequencies  
An FM signal demodulating circuit comprises a peak differential type amplifier having two input terminals, a resonance circuit network connected between the two input terminals of the peak...
4353034 FM Detecting circuit  
An FM signal is applied to an input of a differential amplifier including a pair of transistors having symmetrical characteristics. A 180° phase shifting circuit is connected between two inputs of...
4342000 FM Detecting circuit  
In an FM detecting circuit of either the ratio detecting circuit type or the quadrature detecting circuit type arranged to have an LC resonance circuit and to detect the amount of deviation of an...
4339726 Demodulator of angle modulated signal operable by low power voltage  
A demodulator for an angle modulated signal consists of circuitry particularly adaptable to integrated circuit construction. The various circuit functional groups are adapted to be connected in...
4272726 Differential FM detector with series tuned filter  
A balanced discriminator for frequency modulation systems particularly useful in integrated circuit applications. A source of FM signal having substantially zero source impedance drives a...
4201946 AM-FM Detector circuit stabilized against fabrication and temperature variations  
A detector circuit for detecting AM and FM signals adapted particularly for integrated circuit fabrication which has a circuit configuration that provides highly stable operating characteristics...
4198609 Phase tracked loop frequency demodulator  
A phase tracked loop frequency demodulator having a phase comparator receptive of a frequency modulated signal and a peak-shifting filter for imparting a constant phase shift of 90° over the full...
4160955 Compatible AM-FM frequency discriminator  
A compatible AM-FM frequency discriminator for deriving an FM demodulated output and AFC outputs for FM and AM waves from an FM demodulator employing a quadrature detecting circuit which has...
4127825 Linear frequency discriminator  
A quadrature phase detector having a tuned circuit connected between inputs thereof with a voltage variable reactance connected therein and further connected to the output of the phase detector for...
4123712 Symmetrical polyphase network  
A symmetrical polyphase R-C network, in which each section has a resistor serially connected between its input and output and a capacitor connected between the input of one section and the output...
4119919 Frequency discriminator circuit  
A frequency discriminator circuit suitable for fabrication in a semiconductor integrated circuit has an input terminal connected to an input amplifier for producing two signals of opposite phase...
4100500 Angle-modulation detector having push-pull input applied through high-pass filters  
A circuit adapted to detect an angle-modulated signal including a pair of terminals to which the angle-modulated signal is supplied in push-pull relation and a high-pass filter circuit coupled to...
4054840 FM demodulator using multiplier to which delayed and undelayed input signals are applied  
An FM signal demodulator including a multiplier having a pair of input terminals and an output terminal. A signal coupling circuit is connected between a circuit input terminal and one of the input...
4024461 FM discriminator  
An FM discriminator with AFC signal producing circuits is disclosed having a pair of differential switching circuits which form the discriminator and produce output signals opposite in phase. A...
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