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WO/2000/035080A1 |
An RF amplifier for a transmitter develops a phase modulation command representing a desired phase modulation of an RF signal, and an amplitude modulation command representing a desired amplitude modulation of the RF signal. An oscillato...
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WO/2000/033464A1 |
Phase lock loop systems in which a phase offset is introduced between a reference signal (SR) and a loop signal (SO) to improve linearity. The phase offset is produced by a linearizing network (40) inserted in the phase lock loop between...
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WO/2000/031941A1 |
A transmit modulator which uses a quadrature modulator (102) has a predistortion block (100) which produces a predistorted output signal. The predistortion block (100) pre-compensates for errors introduced by the quadrature modulator (10...
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WO/2000/030250A1 |
An RF amplifier includes an oscillator developing an RF input signal to be transmitted. A power amplifier receives the RF input signal and amplifies the RF input signal to develop an RF output signal. An amplifier control is operatively ...
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WO/2000/030245A1 |
An RF amplifier includes a phase modulator developing a phase modulated RF input signal to be transmitted. A power amplifier receives the RF input signal and amplifies the RF input signal to develop an RF output signal. An amplifier cont...
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WO/2000/024116A1 |
A method and system is described wherein a signal with a lower frequency is up-converted to a higher frequency. In one embodiment, the higher frequency signal is used as a stable frequency and phase reference. In another embodiment, the ...
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WO/2000/021191A1 |
An apparatus and method generate a linearly modulated signal in a polar modulation system. A signal for transmission is separated into a phase component and an amplitude component, and a carrier signal is modulated with the phase compone...
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WO/2000/018002A1 |
A multi-carrier transmitting apparatus and method is described, wherein a plurality of carrier signals are combined in the digital domain and supplied to a D/A converting means (3) for converting the combined digital carrier signals into...
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WO/2000/014867A1 |
The invention relates to a device for generating an amplitude-modulated signal, comprising a reference frequency unit (9) for generating a reference frequency signal; a first tunable oscillator unit (5, 7, 11, 13, 15) for generating a fi...
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WO/2000/011925A2 |
The invention relates to a circuit for frequency synthesis, modulation and AFC, wherein said functions are carried out digitally. The basic aim of the invention is to subdivide the functions channel adjustment (over a broad frequency ran...
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WO/2000/007767A1 |
A tool holder (18) is provided with a transmitting/receiving system (20) for radio communications with a controller (22). A transmitter includes an oscillator circuit (78) for generating a plurality of carriers of different frequencies a...
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WO/2000/007308A1 |
A test method in an RF communication system is described. In the communication system, at least one RF communication channel lies about a known carrier frequency in an RF communication band. According to the method, a diagnostic signal i...
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WO/2000/005807A1 |
A modulator for modulating a carrier signal with a modulating signal, the modulator having an input stage (51) for receiving a directly coupled balanced modulating signal (MS) and for providing a grounding path for the carrier signal (CS...
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WO/2000/004634A1 |
A distortion compensating apparatus for use in IQ modulation and demodulation techniques wherein a first distortion arrangement distorts the I-signal by adding to the I-signal a first weighted function of the I-signal and a first weighte...
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WO/2000/003475A1 |
The invention concerns a vectorial modulator comprising: an input stage (18) generating a pseudo-base of four vectors {+I, +Q}, and including a polyphase filter (21); an output stage (12) for managing the amplitude of the base vectors, a...
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WO/2000/002028A1 |
The sensors include buried electrical feedthrough (112b) to provide an electrical connection into a sealed silicon cavity (108). The buried feedthrough consists of a conductor (112b) in a shallow groove (106) in a substrate (102), commun...
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WO/2000/002014A1 |
A dual output capacitance interface circuit (100) based on switched capacitor circuits and charge subtraction technique provides both voltage output (104) and frequency output (106). The circuit is programmable independently with sensiti...
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WO/2000/001073A1 |
A method and apparatus for adaptively correcting D.C. offset errors imposed upon signals in a communication device. The invention includes a feedback loop correction circuit (122) and method for measuring and reducing D.C. offset errors ...
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WO/1999/055087A1 |
A system for transmitting digital programming includes a program source providing digital information, circuitry for modulating the digital information onto a visual carrier modulated with analog television programming, and a visual tran...
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WO1999043080A9 |
An RF modulator that allows precise, stable phase shifts to be obtained. The modulator uses a PLL structure including an auxiliary feedforward path including an adaptive gain amplifier (411) used to inject a modulation signal into the PL...
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WO/1999/053610A1 |
A signal source for a standard frequency of a PLL (20) is composed of a VCO (24). A VCO (14) is also provided. A first audio signal (L+R) is supplied to the VCO (24) to control its oscillation frequency (f¿24?). A second audio signal (L...
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WO/1999/053608A1 |
A voltage controlled oscillator based on the Colpitt's design is provided. An inductor (Lc) is provided in parallel to one (Cs) of a pair of series connected capacitors (Cs, Cd). The present of the inductor (Lc) modifies the impedance ra...
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WO/1999/049567A1 |
A demodulator circuit for demodulating a frequency modulated input signal comprises filter means (12) for receiving an incoming input signal and for providing a filtered output signal, detector means (16) for receiving the filtered outpu...
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WO/1999/040680A1 |
A modulator loop (700) designed to operate in a frequency range of interest is described. The loop (704) includes a loop output terminal and a switching stage, the output of which is coupled to the loop output terminal. The switching sta...
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WO/1999/035736A1 |
A quadrature modulator (210) and demodulator (310) which provide the requisite level of performance while minimizing power consumption. In the quadrature modulator (210), the I and Q signals are provided to two pairs of mixers. Each mixe...
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WO/1999/031807A1 |
A $g(S)$g(D) modulator-controlled, phase-locked-loop circuit (10), and an associated method, generates a frequency-regulated signal (26) which does not exhibit undesired tones. Dithering signals (46) are generated and are provided to a $...
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WO/1999/030424A2 |
A transmitter in which a complex low IF digitised signal is applied in quadrature to a complex phase comparator (32) together with a digitised frequency down-converted version of an analogue signal produced by a transmitter VCO (46). The...
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WO/1999/029074A1 |
The invention relates to a circuit for generating a signal (OUT) that is modulated depending on the digital data (DATA) to be transmitted using a predetermined modulation method. Said circuit comprises a frequency generator circuit (10) ...
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WO/1999/026349A1 |
A signal generating circuit, a transmitter, and other devices suitable for transmitting and receiving audio signals output from a television picture tube, an audio system, or other devices. An FM modulation circuit (12) has such a struct...
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WO/1999/026361A1 |
A narrow bandwidth signal, such as a narrowband FM signal, is modulated in a modulator that modulates a wide bandwidth signal, such as a CDMA signal, by oversampling the narrow bandwidth signal and applying the oversample narrow bandwidt...
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WO/1999/023756A1 |
According to the invention, a Cartesian control means (16) comprising a phase rotator (50) and a phase adjuster (52) is provided. With a method and a device according to the invention, a system is provided that is unconditionally stable ...
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WO/1999/022442A1 |
A low power radio frequency transmitter, for use at 140 to 225 MHz and output power of 1 to 20 mW, includes a phase lock loop circuit. The transmitter and corresponding receiver make use of GSM integrated circuits normally used at 800 MH...
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WO/1999/019990A2 |
A method of compensating delay in a linearization loop of a power amplifier and a linearization arrangement of a power amplifier, which arrangement comprises an I/Q modulator (10), one or more power amplifiers (13) to be linearized and g...
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WO/1999/019991A1 |
A method for radio frequency (RF) transmission of digital information includes generating an RF signal using a voltage-controlled oscillator (VCO) (32), stabilizing the RF signal from the VCO by providing an error signal from a phase-loc...
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WO/1999/014849A1 |
The invention concerns a circuit for producing a modulated signal (OUT), said circuit comprising a reference oscillator (26) for producing a reference signal (REF); a digital synthesis circuit (18) with a clock input (22) and an added va...
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WO/1999/014859A1 |
A frequency synthesizer has a phase locked loop, a $g(D)$g(S) modulator, and a filter. The phase locked loop includes a frequency divider that controls the frequency of the phase locked loop output signal. The output of the $g(D)$g(S) mo...
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WO/1999/014850A1 |
A $g(D)$g(S) controlled phase locked loop modulation is used with limited oversampling factors while fulfilling the spectrum and/or phase noise requirements on the modulation in the phase locked loop. By filtering the quantization noise ...
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WO/1999/013568A1 |
A Gilber Multiplier Cell includes an emitter-coupled transistor and a pair of cross-coupled emitter-coupled transistor pairs. A filter couples the emitter-coupled transistor pair to the pair of the cross-coupled emitter-coupled transisto...
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WO/1999/013590A1 |
An RF transmitter employs negative feedback to reduce non-linearities in power amplifying means (18 to 21) and, since the transmitter received as input I and Q components, a Cartesian Loop is provided, by means of which a signal derived ...
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WO/1999/007066A1 |
A frequency synthesizer includes a controlled oscillator which is responsive to a frequency control input signal, to generate an output frequency. A programmable frequency divider is responsive to the output frequency and to a divider co...
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WO/1999/007065A1 |
A frequency modulation (FM) radio transmitter, such as a cellular telephone, includes an automatic deviation control system to automatically compensate for varying sensitivity of the FM transmitter. The FM transmitter includes a phase lo...
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WO/1999/005783A1 |
A method and apparatus for efficient power amplification with low distortion includes an enveloppe detector (220), a difference amplifier (130), an envelope amplifier (270), and a power amplifier (260). A feedback path is provided from t...
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WO/1999/004558A1 |
The invention relates to a method for vestigial sideband modulation of the carrier of a television transmitter with a video signal. The video signal is divided by means of filters into two signal parts which are in quadrature to each oth...
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WO/1998/057420A1 |
New and improved apparatus and methods for controlling the frequency spectrum of a clock signal, for example, to reduce EMI emissions. A PLL circuit (300) receives the signal (302) and generates an output signal (326). A modulating circu...
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WO/1998/053879A1 |
The present invention includes a defibrillation system and method for treating a heart experiencing a ventricular arrhythmia by preconditioning a region of cardiac tissue surrounding a defibrillation electrode using a plurality of high e...
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WO/1998/053552A1 |
A modulation circuit (10) converts input data in a symbol generator (100) to M symbol values which are converted in in-phase and quadrature phase generators (200, 250) to M in-phase and M quadrature phase time domain samples which are co...
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WO/1998/045936A1 |
A method and system of frequency for multiplying a signal (data in) having amplitude modulated by an amplitude modulator (10) using a frequency multiplier (13) operated at a bias voltage that is less than its saturation mode voltage. Pri...
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WO/1998/043364A1 |
A multi-carrier radio system in which pairs of subcarriers are positioned in frequency such that each subcarrier in a pair is the image of the other subcarrier in the pair. By making each subcarrier the image of another subcarrier, the r...
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WO/1998/040966A1 |
A system and method for transmitting digital information concurrent with a co-existing monophonic amplitude modulated (AM) signal are disclosed. The system allows any AM transmission, in particular commercial AM Radio Broadcasts, to inco...
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WO/1998/038730A1 |
The invention concerns a modulating electronic circuit with m phase status m$m(G)2 comprising a distribution line (6) with n similar dephasing cells (Ci) n$m(G)2, each comprising a transistor supplying on a derivative output (ODi) an out...
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