Matches 401 - 450 out of 532 < 1 2 3 4 5 6 7 8 9 10 11 >
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6115595 Integrated circuit using a power supply input for digital logic  
A GPS receiver including an RF GPS integrated circuit downconverter having a standby mode controlled by a power supply input used as a logic signal. The RF GPS integrated circuit includes a...
6115594 Frequency converter used in a microwave system  
A frequency converter for a microwave system includes: a balun having a slot line connected in a parallel T-junction with a first microstrip line for receiving a radio frequency signal; first and...
6108529 Radio system including FET mixer device and square-wave drive switching circuit and method therefor  
A radio comprising an FET mixing device for multiplying a first-frequency signal with a second frequency signal to generate a third frequency analog mixer output signal. A local oscillator input...
6088581 Method and apparatus for reducing amplitude modulated interference in a receiver  
A direct conversion receiver (DCR)(10) comprises amplitude modulated interference (AMI) nulling circuitry (32) for achieving enhanced cancellation of AMI. The AMI nulling circuitry (32) includes a...
6073001 Down conversion mixer  
A quadrature down converter comprises two channels, each of said channels comprising two parallel signal paths. Each of said signal path comprises a mixer mixing the signal for down conversion with...
6064871 Low power ΔΣ convertor  
A low power passive ΣΔ converter for baseband applications and with a built in mixer for direct conversion. For direct conversion, low power consumption is achieved by adopting a passive loop...
6052039 Lumped constant compensated high/low pass balanced-to-unbalanced transition  
The invention proposes a lumped constant compensated high/pass balun (balance line to unbalance line transition). The proposed circuit can be used in microwave integrated circuit(MIC) and...
6046486 Heterojunction bipoplar mixer circuitry  
Mixer circuitry having a semiconductor body formed therein mixer circuitry having an oscillator having a heterojunction bipolar transistor and a mixer having a Schottky diode. The heterojunction...
6044255 Radio frequency circuit with integrated elements and method of manufacture  
A radio frequency circuit is disclosed which includes a low-noise amplifier and a mixer integrated on the same semiconductor chip by using a silicon BiCMOS process. The low-noise amplifier has a...
6041223 High level diode mixer  
A double balanced mixer consisting of two complementary solid state switches, with a high reverse-bias voltage provided by isolating the sides of the complementary solid state switches receiving...
6029052 Multiple-mode direct conversion receiver  
A multiple-mode receiver incorporating direct conversion (processing received signals using intermediate frequencies within the same frequency range as the received signal bandwidth) rather than...
6009318 Electronically adjustable balanced-to-unbalanced converters (balun)  
Electronically adjustable baluns and electronically adjustable balanced-to-unbalanced converting methods are provided. The electronically adjustable baluns are responsive to an electronic tuning...
6006080 Receiving mixer circuit for mobile radio transceiver designed to operate with multiple modulation modes and multiple frequency bands  
A receiving mixer device for a mobile radio transceiver which operates with multiple modulation modes and within multiple frequency bands. The receiving mixer includes a plurality of mixers each...
5999804 Low noise quadrature mixer circuit  
A low noise quadrature mixer circuit for RF has an input stage which is a single ended to differential converter, where the cascode transistors each include two transistors with common emitter and...
5983089 Slotline-mounted flip chip  
First and second slotlines are mounted on an electrically insulating substrate having a planar face with a connection region. Each slotline has first and second, spaced-apart coplanar conductors...
5983088 Wide frequency spectrum television tuner with single local oscillator  
A tuner includes a conversion (or heterodyning) stage, including a local oscillator and a mixer, for converting an RF signal corresponding to a selected channel to an IF signal. The local...
5973570 Band centering frequency multiplier  
A frequency multiplier (120) having a tunable resonant circuit (122), is anticipated for use with a frequency synthesizer (100) having a Voltage Controlled Oscillator (110). The VCO control line...
5974306 Time-share I-Q Mixer system with distribution switch feeding in-phase and quadrature polarity inverters  
An image-rejecting receiver comprises a tunable mixer stage, a time-share I-Q mixer stage, a complex filter, and an image rejector. The time-share I-Q mixer stage includes a switch assembly,...
5970401 Balanced-type mixer having circuit board  
A balanced-type mixer having easier mounting of a circuit board into a dielectric line apparatus, easier matching between a dielectric line and diodes, and reduced conversion loss. A first...
5937338 Scanning radio receiver  
A scanning radio receiver of triple conversion superheterodyne tuning, having a CPU and a keyboard. The CPU has a programmable memory to store frequencies received by the scanning radio receiver. A...
5933771 Low voltage gain controlled mixer  
The functionality of a variable gain controlled amplifier and a tree mixer are combined to provide a variable gain controlled mixer. In constructing the combination, both the current-to-voltage...
5930697 Heterodyne receiver with synchronous demodulation for receiving time signals  
A heterodyne receiver operating on the principle of synchronous modulation for time-signal reception where a first mixer is driven by the first phase-locking loop which is fed from a reference...
5924018 Analog microwave communication system having a microwave hop converted to a new operating frequency and method  
A converted analog radio (71) is disclosed for converting an analog microwave hop (70) to a new operating frequency. The converted analog radio (71) comprises an analog radio (72) operable to...
5920810 Multiplier and method for mixing signals  
A multiplier (10) includes a transconductor (14) and a multiplier core (34). The transconductor (14) converts an RF voltage signal to an RF current signal. The RF current signal modulates the...
5920811 Superconductor mixer and phase control method therefor  
In a superconductor mixer, a non-linear element is provided on a substrate. The non-linear element comprises at least one Josephson junction connected in series. An antenna pattern of...
5918166 Level control circuit for portable radio communication apparatus  
A compact level control circuit without using a shield structure is suitably provided in a small space such as a portable radio communication apparatus. A level control circuit for a portable radio...
5915223 Multimode radiotelephone  
A wireless telephone is disclosed having two antennas and associated filters tuned to first and second frequency bands, respectively. A selection device selects one of the antennas under the...
5903827 Single balanced frequency downconverter for direct broadcast satellite transmissions and hybrid ring signal combiner  
A monolithic microwave integrated circuit (MMIC) semiconductor chip, for use with a hybrid coupler, in a frequency downconverter. The chip has a first input lead for receiving a first combined...
5903196 Self centering frequency multiplier  
A frequency multiplier (120) having a tunable resonant circuit (122), is anticipated for use with a frequency synthesizer (100) having a Voltage Controlled Oscillator (110). The VCO control line...
5883553 Filter unit adapted for miniaturization and for selecting a particular signal where a plurality of signals different in bandwidth coexist  
In a filter unit having a first and a second bandpass filter (21 and 22) and an input terminal (101) supplied with a unit input signal, the first bandpass filter has a first filtering bandwidth...
5857004 Digital data receiver  
A digital data receiver comprising a first frequency converter for converting a high frequency digital orthogonal modulation signal into a first intermediate frequency signal based on a first local...
5850595 Arrangement for reducing interference in tuned circuits in integrated circuits  
An arrangement for reducing interference in tuned circuits in integrated circuits as a result of the reception and transmission of high frequencies. An external tuned circuit is integrated in the...
5841814 Sampling system for radio frequency receiver  
A radio frequency (rf) receiver adapted to receive a number of different digitally modulated rf input signals such as quadrature amplitude modulated (QAM) and vestigial side band (VSB) rf input...
5839062 Mixing, modulation and demodulation via electromechanical resonators  
Mixing, modulation and demodulation using the nonlinear properties of microelectromechanical resonators and filters are described. Mixing followed by filtering is implemented using...
5825254 Frequency converter for outputting a stable frequency by feedback via a phase locked loop  
A frequency converter capable of providing a highly stable frequency by frequency feedback using a phase locked loop circuit. The frequency converter includes a local oscillator; a frequency...
5812943 High frequency band high temperature superconductor mixer antenna which allows a superconductor feed line to be used in a low frequency region  
The invention provides a wide frequency band high temperature superconductor mixer antenna which allows a superconductor feed line, which exhibits a high resistance loss in a high frequency region,...
5760645 Demodulator stage for direct demodulation of a phase quadrature modulated signal and receiver including a demodulator stage of this kind  
A demodulator stage for direct demodulation of a phase quadrature modulated signal provides two baseband signals and comprises a matched 900° coupler to which the modulated signal is fed and...
5754951 Microwave mixing circuit and a down converter comprising it  
A microwave mixing circuit of a small size for selecting a signal to be received out of plural microwave signal inputs, and converting it to an intermediate frequency signal, and a down converter...
5732345 Quasi-double balanced dual-transformer dual FET mixer, which achieves better isolation by using a first and second diplexer, and a transmission line RF balun  
A double balanced dual-quad transformer dual field effect transistor (FET) mixer is disclosed using a first and second (FET) which have their gates electrically connected together, such that the...
5732343 Microwave harmonic mixer circuit of super conducting quantum interference device  
Microwave harmonic mixer circuit of SQUID(Superconducting Quantum Interference Device) is disclosed, in which a magnetic flux to voltage conversion characteristics of SQUID is used for generating a...
5732344 Additive HF mixer  
HF mixer for changing the frequency of an alternating voltage input signal at the circuit input to an output signal supplied at the circuit output, with an input signal source for generating the...
5697090 SHF converter  
An SHF converter with less change in local oscillation frequency due to change in ambient temperature. The SHF converter is at least equipped with a low noise amplifier 1; a local oscillator...
5697092 Floating fet mixer  
A floating FET mixer (1) comprises: a field effect transistor, FET, (2) having a gate (11), a drain terminal (4) and a source terminal (5), an LO port (10) at which an LO signal from a local...
5678225 Direct-coupled active balanced mixer  
A low power, high-performance mixer includes a Schottky diode ring and first and second active baluns. The first active balun has an input coupled to a radio frequency (RF) signal and generates a...
5659894 Dual-channel low current low noise block downconverter  
An electrical circuit forming a dual-channel low current Low Noise Block (LNB) downconverter comprising two downconverting circuits electrically connected in series with each other and each...
5648985 Universal radio architecture for low-tier personal communication system  
An integrated circuit chip set is provided for use in a radio communication system in which a modulated digital input signal is processed for transmission and a modulated signal received from an...
5640698 Radio frequency signal reception using frequency shifting by discrete-time sub-sampling down-conversion  
An RF communications receiver permits greater integration on standard silicon chips and consumes less power than previous receivers. Sub-sampling and discrete-time signal processing techniques are...
5634207 Frequency converter capable of reducing noise components in local oscillation signals  
A frequency converter includes a high-frequency signal input circuit for forming a high-frequency signal with bias voltage or current to output a bias-added high-frequency signal; a local...
5557642 Direct conversion receiver for multiple protocols  
A novel direct conversion receiver utilizing a sample and hold circuit for subsampling the input signal. The output of the sample and hold circuit is applied to a sigma-delta loop to provide a high...
5530927 Doubly balanced superconductive mixer network  
A feed network parallel superconductive tunnel junction circuit that acts as a doubly balanced mixer and can be utilized as a millimeter wave satellite communications link. A quadrature-fed mixer...
Matches 401 - 450 out of 532 < 1 2 3 4 5 6 7 8 9 10 11 >