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WO/1995/034128A1 |
Amplifier comprising a GaAsFET at which arrives a modulated microwave input signal QAM. The circuit originates from the observation that the s parameters of the FET diffusion matrix show slight dependence on the operating point (VDS, IDS...
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WO/1995/032546A1 |
An improved modulator circuit (10) for mixing a modulation signal with a carrier signal includes a first harmonic mixer (20) and a second harmonic mixer (30). The mixers (20, 30) are operative to produce a modulated output signal with co...
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WO/1995/027330A1 |
A synchronous detector (200) has first and second mixer circuits (206, 208) and a voltage-controlled oscillator (212). The voltage-controlled oscillator provides a local oscillator signal directly to the second mixer circuit and indirect...
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WO/1995/027329A1 |
A tuning circuit for a reference oscillator (200) including voltage variable capacitors (222, 224) in a back to back configuration and providing a control terminal for voltage controlled tuning of the reference oscillator (200). Also inc...
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WO/1995/027339A1 |
In a data transmitter (200), a precision timing signal receiver (201) provides a precise timing signal (203) to an informationnaly responsive comparator (205). The informationally responsive comparator compares an output (211) of a contr...
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WO/1995/024781A1 |
A broadcasting method for simultaneously broadcasting analog and digital signals in a standard AM broadcasting channel is provided by: broadcasting an amplitude modulated radio frequency signal having a first frequency spectrum, wherein ...
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WO/1995/024074A1 |
A programmable apparatus for generating a frequency modulated signal at a selected center frequency in accordance with digital data with at least first and second data levels. A modulator (331) is responsive to an input modulation signal...
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WO/1995/023453A1 |
Transmitting signals containing amplitude modulated (AM) and phase modulation (PM) components requires a transmitter having AM and PM control loops (515, 517). The PM control loop provides phase modulation, frequency translation and phas...
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WO/1995/023458A2 |
In a transmitter (100), circuitry is employed to automatically calibrate errors in a modulated carrier signal. A generator (320) is activated to generate (510) a low frequency square wave for use as data, which is used to generate a modu...
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WO/1995/022196A1 |
A continuous phase modulation device consisting of a frequency synthesizer having a variable oscillator (1) and a phase-locked loop (5-6) with, in series, a frequency divider circuit, a phase comparator and a low-pass filter (5). Modulat...
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WO/1995/020284A1 |
An I/Q quadraphase modulator/demodulator circuit for correcting phase errors of, typically, LO input quadrature signals. The circuit uses a pair of Gilbert cell multipliers, to the bottom ports of which are applied I and Q signals, and t...
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WO/1995/017039A1 |
A generator of high frequency (HF) vibrations is disclosed, as well as an arbitrary HF modulation process. The modulation generator contains digital numeric control oscillators (NCO) after which digital-analogue conversion is performed, ...
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WO/1995/016304A1 |
A modulator circuit for modulating a radio frequency (RF) signal with two signals which are in quadrature with one another includes a phase-locked loop (PLL) with a quadrature modulator within its output signal feedback path. The PLL gen...
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WO/1995/016303A1 |
In a quadrature modulation system which includes an adder for adding the phase shifted signals and an amplifier, a low pass or band pass filter is interposed between the adder and amplifier to eliminate the unwanted sideband associated w...
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WO/1995/015500A1 |
A modulating reflector circuit arrangement comprising a transistor (1) configured by means of a feedback arrangement (10) upon operation within a linear region of the transistor's current/voltage characteristic to reflect an incoming amp...
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WO/1995/013651A1 |
A phase-locked loop frequency modulation circuit that compensates for the inability of a phase-locked loop to pass low-frequency content of an input modulation signal, and that may be utilized with existing communication apparatus, such ...
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WO/1995/013664A1 |
A method and apparatus integrate a plurality of input signals. A first integrator (225) integrates a first of the input signals and a second integrator (230) integrates a second of the input signals. A summer (235) is connected to the fi...
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WO/1995/012243A1 |
A frequency synthesizer (107) utilizes a variable oscillator (114) the output of which is used as the frequency synthesizer output (115) and is fed to a digital divider (108). The output of the digital divider (108) feeds one input of a ...
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WO/1995/010136A1 |
A compact local oscillator network for use in a quadrature modulator and/or demodulator is presented. Single side band circuitry is configured to produce quadrature signals with a high degree of accuracy such that two equal amplitude sig...
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WO/1995/008241A2 |
A speech encoder converts analog speech signals into a stream of binary coded speech samples. A circuit for performing analog to digital conversion compares an input speech signal with a signal from a digital integrator. Based on the com...
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WO/1995/005128A1 |
The embodiments of the inventions disclosed in this application develop a "protection" electric, magnetic or electromagnetic field or fields which are either superimposed upon an ambient field which is detrimental to the health of living...
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WO/1995/000859A1 |
A carrier frequency modulating system and method for producing a modulated carrier frequency is disclosed. The system comprises a carrier frequency signal generator (23) for producing a carrier frequency signal at a carrier frequency at ...
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WO/1995/001005A1 |
Method consisting in modulating the amplitude of a signal by summing the output signals of two power amplifiers (3, 4) having the same previously defined amplitude but each symmetrically phase-shifted in relation to a reference signal. T...
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WO/1994/026049A2 |
A full duplex data transceiver for transmitting and receiving trinary frequency-modulated ("FM") signals representing binary data includes at least one antenna and a single oscillator which serves as both the radio frequency ("RF") signa...
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WO/1994/024759A1 |
The invention provides a balanced modulator, which has at least one individual amplitude modulator (230) which does not provide a suppressed-carrier output. One example employs a single amplitude modulator (230) whose carrier input is se...
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WO/1994/020888A2 |
A radio frequency (RF) transceiver includes a direct modulation transmitter and single down-conversion receiver for operation in a time-division-duplex (TDD) telecommunications environment. A single RF signal source, in the form of a pha...
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WO/1994/010779A1 |
A digital system accomodates analog communications, thus avoiding the need for separate subsystems each dedicated to either analog or digital communications. The system includes a receive circuit for converting received signals into an i...
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WO/1994/010747A1 |
The assembly proposed comprises a phase-control loop (PLL) in which frequency stability is ensured by means of signals (rges, rgas) and transmission signals (us) are modulated by modulation signals (ms), e.g. analogue voice signals. Mean...
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WO/1994/009561A1 |
A method and apparatus for generating an output signal (616) having a pre-determined frequency shift relative to the frequency of a reference signal from a reference frequency generator (102) comprise a digital phase-locked loop (206) co...
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WO/1994/007302A1 |
A digital exciter (30) for selectively modulating digital or analog input data. The digital exciter includes a digital signal modulator (32) and a digital quadrature modulator (DQM) (36) comprising two digital signal processors (DSPs). T...
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WO/1994/006204A1 |
A digital frequency synthesizer circuit with spur compensation includes a demodulator circuit (118) for demodulating the output signal (116) of the synthesizer's accumulator (108). Demodulator (118) also inverts the signal, and provides ...
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WO/1993/023921A1 |
A highly efficient linear amplifier and/or modulator and demodulator comprising first and second feedback loops is provided. Each loop processes a component of the input signal and the component signals are recombined at, for example, a ...
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WO/1993/022829A1 |
A PLL circuit modulatable by a modulation signal having a direct current component has a voltage-controlled main oscillator (VCO1), a loop divider (ST), a phase comparator (PD) and a loop filter (SF). The standard frequency signal for th...
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WO/1993/019457A1 |
A computer having one or more wave tables (10, 12, 14, 16) stored therein is used to synthesize sounds represented by a series of digital samples produced at a sample rate by specifying parameters including a carrier frequency (8), a mod...
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WO/1993/018578A1 |
A low-power digital frequency synthesizer combining direct digital frequency synthesis techniques with serrodyne frequency translation principles to produce a wideband frequency response with high spectral purity. A conventional direct d...
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WO/1993/018597A1 |
A low cost spread spectrum modulator for BPSK, or Binary Phase Shift Keying capable of outputting the high modulation rate and suppressed carrier output needed in spread spectrum systems. The present invention provides high quality BPSK ...
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WO/1993/016523A1 |
The present patent application discusses the use of a frequency synthesizer (903) in a radiotelephone (901). The synthesizer (903) is of a fractional N type. The synthesizer (903) utilizes multiple latched accumulators (1000), within an ...
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WO/1993/014597A1 |
A multichannel television access control system is disclosed wherein processing of the broadbande signal is performed by gated coherent RF injection on a plurality of channels, thereby effecting selective descrambling of an arbitrary sub...
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WO/1993/011279A1 |
Electrical power distribution system for active cathodic protection of reinforced concrete consists of a power supply (A), computational means (B), a cabling system (C) with only few common conductors, electric connection means to the re...
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WO/1993/005569A1 |
A phase locked loop frequency synthesizer with DC data modulation capability is described. This synthesizer includes an arrangement for detecting one of a plurality of FSK data levels (61), generating a corresponding predetermined compen...
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WO/1993/001657A1 |
Briefly, according to the invention, a multi-loop synthesizer (100) for producing an output signal (114) having minimum spurious components is described. The multi-loop synthesizer (100) includes a first synthesizer loop (116) which has ...
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WO/1993/000738A1 |
Known circuit boards having an oscillator and a modulator or demodulator are very costly, because the perturbing radiation emitted by the oscillator must be well screened off. In order to decouple the oscillator frequency, a transmitter ...
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WO/1992/020144A1 |
A fractional-N frequency synthesizer (103), realizes automatic frequency control by adding in a modulation processing circuit (215) a digital representation of a determined frequency offset to a digital representation of applied modulati...
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WO/1992/020146A1 |
In a QAM microwave radio communications system an IF (intermediate frequency) input signal (10) is amplified (12) and predistorted (14), and the amplified IF signal is mixed (20) with a local oscillator signal (18) to produce an RF (radi...
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WO/1992/017947A1 |
The present invention relates to a device, identification apparatus and method where a single carrier frequency is used by any number of remote device(s) upon which data or information is modulated for transmission to an interrogator, th...
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WO/1992/011692A1 |
An improved frequency modulation apparatus (100) is provided comprising a generator (102), a biasing voltage line (116), and an interface circuit (110). The generator (102) is utilized to generate a carrier signal. A control line input (...
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WO/1992/008297A1 |
An apparatus and method for linearizing the gain of a nonlinear power amplifier (115) in a TDM digital transceiver. The power amplifier's transfer function describes a relationship between its input signal and output signal. The output s...
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WO/1992/008283A1 |
An adjustable slew rate amplifier (26) in the input stage of an amplifier circuit (10) helps reduce off-channel frequency splatter. In instances where test sequences are input to an amplifier circuit that are used to measure maximum perm...
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WO/1992/008291A1 |
A method (100) and device (300) are set forth for, where a linear transmitter has inphase and quadrature modulation paths for an input signal and at least one open feed back signal path is provided, substantially correcting an initial ph...
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WO/1992/008280A1 |
A linear transmitter (10) having both an open loop and a closed loop training mode capability functions to schedule and facilitate these training modes in a manner that reduces adjacent channel splatter. A training waveform can be utiliz...
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