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WO/1992/006535A1 |
A method and apparatus for modulating a radio frequency signal with digital data including: a variable oscillator (12), a modulator (12) for varying the oscillator's output, a network (18) for detecting when the oscillator's output cross...
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WO/1992/004765A2 |
An improved frequency synthesizer (100) capable of producing true DC frequency modulation without the need to DC frequency modulate the reference oscillator. The synthesizer (100) includes a phase comparator (104) which compares the refe...
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WO/1992/004766A1 |
A multiple latched accumulator fractional-N synthesizer for use in digital radio transceivers is disclosed. The divisor of the frequency divider (103) of the synthesizer is varied with time by the summation of accumulator carry output di...
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WO/1992/002077A1 |
A synthesizer circuit (10) with spur compensation utilizes fractional division in the synthesizer loop. The fractional divider (12) includes means for compensating the spurs when the fractional numerator N ± 0. The synthesizer (10) incl...
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WO/1991/020124A2 |
A digital synthesizer for record circuitry of, e.g., a VCR, is supplied with digital samples representing a video signal. A calculator stage (16), responsive to the digital samples calculates a sequence of pulse periods defining a pulse ...
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WO/1991/018444A1 |
A D.C. modulated phase locked oscillator (60, 80, 100, 140, 160, 190, 220, 264, or 290) includes a phase locking oscillator (70, 90, 128, 180, 192, 222, 266, or 292) and a D.C. modulator (72, 92, 130, 156, 182, 194, 224, 268, or 294). Bo...
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WO/1991/017604A1 |
A fractional-N synthesizer (803) employing at least a second order sigma-delta modulator (900) is disclosed. The most significant bits from the output accumulator (1011) of the sigma-delta modulator are used as the carry out control for ...
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WO/1991/011852A1 |
A frequency modulated phase-locked loop frequency synthesizer (100) is switched in frequency by switching the dividing ratio of a frequency divider (133). A control circuit (200) responsive to the switching and to the output of a phase d...
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WO/1991/011053A1 |
A method of compensating for non-linearities in an end amplifier (F) having a given transfer function HR, HO for amplitude and phase respectively and included in a radio transmitter of quadrature type for linear, digital modulation, and ...
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WO/1991/009432A1 |
The invention relates to the coupling of electric signals to and from high-speed electronic components, being particularly suited to couple high-frequency signals or very short pulses to diode lasers, and from high-speed photodiodes. The...
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WO/1991/008614A1 |
Generator producing a frequency modulated signal of the "ramp signal" type (20) by means of SAW dispersive filter generation (19). The phase error inherent in the SAW component is corrected by a phase lock loop (22) which receives a prep...
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WO/1991/007828A1 |
An integrated, multimode FM radio system including a common reference clock (4) providing synchronized digital signal processing for both transmission (1) and reception (2). The radio system according to the present invention also includ...
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WO/1991/007016A1 |
The invention relates to a phase locked loop for producing a reference carrier for a coherent detector, comprising a first phase detector (9) which compares the estimated carrier frequency of an incoming signal and the frequency of a loc...
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WO/1991/006149A1 |
A transmitter (100), with an inphase input (102) for receiving an inphase baseband input signal, and a quadrature input (112) for receiving a quadrature baseband input signal, comprises a modulator (130), coupled to the inphase and quadr...
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WO/1991/003899A1 |
A communications method and apparatus for zero sideband amplitude modulation is described. Plural digital representations of sinewaves having different amplitudes but same periods are contained in a read-only memory. Selection between th...
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WO/1991/002404A1 |
A modulator circuit comprises an input (12) for receiving an audio frequency (AF) signal, an oscillator circuit (2) for providing a carrier wave signal, a mixer circuit (10) for mixing the AF input signal with the carrier wave signal to ...
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WO/1991/000653A1 |
A linear transmitter which controls a bias voltage of the drain electrode or the collector electrode of a high-frequency amplifier based on an envelope of modulated waves, wherein the envelope is formed by using in-phase envelope compone...
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WO/1990/014710A1 |
A modulated clock signal (28) is provided to a logic circuit that may include a microprocessor, microcontroller or digital signal processor (10). Modulating the clock signal spreads the energy spectrum of the clock signal so as to reduce...
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WO/1990/014711A1 |
An apparatus and method is disclosed which phase locks a frequency-agile modulated output signal to any selected channel of a comb generated output (25). The phase error of an input signal (14) is tracked, the input signal is modulated u...
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WO/1990/012451A1 |
A frequency-modulated signal is digitally integrated through an integration circuit (20) and is phase-modulated through a phase-modulating circuit (30). The modulated signal that is integrated is converted through the phase-modulating ci...
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WO/1990/011643A1 |
A frequency synthesizer (10) for providing a modulated output signal (fo) includes a reference frequency signal (fr), a voltage controlled oscillator (14), a programmable divider (16) and a phrase detector (12). A first integrator (24) f...
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WO/1990/008432A1 |
A method for transmission and reception of reflex-modulated signals in which a reflex-modulated signal containing all the frequency components of the upper (flim + fo) and lower (flim - fo) side bands is generated at the transmitting sid...
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WO/1990/005408A1 |
A diode circuit in which the flicker noise generated by the diode is reduced comprises a diode (D1) connected in series with a resistor (R2) having a by-pass capacitor (C1) in parallel therewith. In one embodiment the side of the diode r...
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WO/1989/007865A1 |
A method and arrangement for electronically bandswitching a radio (100) is described which includes at least a receiver (110, 111), a PLL (120), and a fully synchronized, programmable counter as a frequency divider (140) that is coupled ...
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WO/1989/006460A1 |
A quadrature amplitude modulation system utilizes two subcarrier signals (11, 12) each quadrature modulated with information signals (S1, S2, S3, S4) which are quadrature modulated onto the RF carrier (22). This provides a hole in the ce...
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WO/1989/004974A1 |
A weather radar system in which a magnetron transmitter (10) is controlled in frequency by a low power locking signal from a stable frequency source (25). An automatic frequency control (AFC) (44) maintains frequency lock between the sou...
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WO/1989/000788A1 |
An output having reduced additive phase-noise in at least one defined frequency band is obtained from a voltage-controlled oscillator (5) by applying a frequency-modulating signal omegamt to the oscillator to produce a sideband within th...
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WO/1988/009089A1 |
Phase locked, pulsed oscillator apparatus (60), for example, for radar use, comprises a pulsed r.f. oscillator (62), a pulse repetition frequency (PRF) generator (64) and a pulse shaping network (66). The PRF generator pulsed output sign...
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WO/1986/005936A1 |
A digital Zero-IF Selectivity Section (DZISS) (20, 20'). The DZISS of the present invention teaches a topology that facilitates realization in both transmitter (20') and receivers (20). In the preferred low-speed embodiment, the digital ...
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WO/1986/001905A1 |
Tuning of an RF probe (10) by comparison with a 50 ohm terminator. A Fourier transform NMR spectrometer is used in the comparison operation. The spectrometer comprises an oscillator (30) modulated by a modulator (32) and a signal is dire...
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WO/1986/000767A1 |
An automatic deviation control circuit for an angle modulated data transmitter wherein the deviation level of modulated data output from VCO (300) is controlled by a modulation cancelling deviation error detection feedback loop comprisin...
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WO/1986/000476A1 |
An RF amplifier arrangement for providing output signals having a controlled frequency distribution and wherein the amplitude and phase of the input signals to an RF amplifier (18) are controlled as a function of the amplitude and phase,...
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WO/1985/003180A1 |
A high speed digital data modem (10) particularly suited for use in a dial up telephone line. For the transmit ensemble (30), the telephone pass-band is divided into sixty-four sub-bands each with a carrier located approximately in the c...
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WO/1985/000942A1 |
In a compensated VCO circuit arrangement for providing constant modulation level over a wide frequency band a VCO (55) is disclosed having a linear VCO gain factor vs. control voltage curve over the wide frequency band of interest. A com...
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WO/1983/004148A1 |
A circuit for changing the frequency of a pulse train (10) in response to a change in the average value of an applied digital signal (18) applies the signal to be changed to a pulse subtractor (12). Application of a predetermined number ...
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WO/1983/000782A1 |
An amplitude modulation circuit which has no modulation distortion even at high modulation factors while still maintaining its ability of high integration. In an amplitude modulation circuit having a first differential pair (D1) with a c...
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WO/1983/000411A1 |
Amplitude modulation circuit in which a resonant circuit (12) which determines the carrier frequency is connected to the collector of one transistor (T14) forming the differential pair of a differential amplifier (13) connected on the gr...
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WO/1982/004507A1 |
The amplitude modulator includes a pulse generator (1-3) which supplies pulses at a carrier frequency to a pulse width modulator (4) to which a modulation signal is applied from a source of modulation signals (5-9) to produce a bipolar p...
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WO/1982/004365A1 |
Improved radio transmitter modulation control circuitry which significantly increases the average power of the modulating signal, resulting in enhanced audio signal quality since the signal-to-noise ratio is likewise increased. The inven...
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WO/1982/003510A1 |
A wideband, modulation sensitivity compensated, voltage controlled oscillator which automatically and continuously compensates over a wide bandwidth for modulation sensitivity variations resulting from changes in the center frequency of ...
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WO/1982/003477A1 |
A frequency synthesized transceiver capable of tuning to a plurality of communication channels. The transceiver includes a receiver section (72) and a transmitter section (74) which are coupled to the synthesizer which generates the appr...
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WO/1982/000544A1 |
A complex RF weighter provides an RF output signal controlled in amplitude and phase with respect to an input signal. The input signal is applied to a quadrature hybrid (14) that is terminated with two PIN diodes (16, 18), one of which i...
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WO/1982/000226A1 |
A single carrier is amplitude-modulated by a signal which is a transform (as the sine function) of the audio signal, and one set of sidebands is removed. In a receiver (76), the signal can be recovered by first deriving the Hilbert trans...
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WO/1981/003250A1 |
Various arrangements for eliminating undesired side effects of modulation deviation within a phase-locked loop frequency synthesizer are presented. Angle modulation is simultaneously applied to two or more points within the synthesizer i...
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WO/1981/000942A1 |
In a multi-channel FM radio communication system for simultaneous communication in both directions used in the VHF and UHF bands, the transmitter is provided with a phase-locked loop (30) between a band pass filter (9) and a pre-amplifie...
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WO/1980/002625A1 |
A generator of electric oscillations comprising an exciter (1) and an output amplifier stage (2) based on a electron tube (3) with common-grid connection. A section (7a) of the input-circuit of the electron tube (3) is connected to the o...
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WO/1980/001343A1 |
Precision phase modulator (30) wherein a carrier signal of constant amplitude and frequency (aO cos (Alpha) t and a modulating signal (36) are applied to the two inputs of the first one of a cascade of linear suppressed-carrier amplitude...
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WO1979000718A1 |
Significant suppression of one side band of a carrier wave, frequency modulated by a baseband signal, is achieved by simultaneous and direct amplitude modulation of the carrier wave with the baseband signal when a ratio (P, fig. 2) of mi...
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WO/1979/000051A1 |
For use, for example, in an interferometric amplifier of high frequency amplitude modulated signals, arc-cosine phase modulation is achieved by transforming (10) the baseband signal with a tanh-1 transformation function, by modulating (2...
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JP7488176B2 |
To reduce the fluctuation of the center frequency of an FM modulation signal output by a digital FM modulator without storing the correction value of the center frequency in a storage element.A digital FM modulator includes a first multi...
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