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7623838 |
Sampling mixer with asynchronous clock and signal domains
A mixer 1100 with a plurality of signal paths typically requires separate clock generating hardware for each signal path. However, the redundancy of having multiple clock generating hardware...
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7603099 |
Direct-conversion receiver system and method with quadrature balancing and DC offset removal
A system and method are provided for direct-conversion of a modulated radio-frequency (RF) signal. After receiving an RF signal, the RF signal is mixed with a plurality of oscillator signals with...
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7580693 |
Passive reflection mixer
In one aspect, a mixer that provides improved isolation between an input oscillator and a mixing cell. In another aspect, a mixer that includes circuitry operative to shape an input signal provided...
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7541966 |
Apparatus and method for demodulating a modulated signal
An apparatus for demodulating a modulated signal comprises an analog to digital converter ( 2, 12 ) for converting an analog modulated input signal to a digital signal. The analog to digital...
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7403751 |
DC offset calibration system
A division ratio of a first frequency divider that generates a local signal and a division ratio of a second frequency divider that generates a RF interfering signal are different, and a first...
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7376410 |
Methods and systems for down-converting a signal using a complementary transistor structure
Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate...
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7356318 |
Quadrature subharmonic mixer
A quadrature subharmonic mixer comprises a polyphase filter configured to generate quadrature components of a local oscillator (LO) reference signal, a summing and scaling element configured to...
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7254380 |
Low flicker noise current-folded mixer
The current-folded mixer of this invention comprises an input stage and a switching stage. The input stage receives a radio frequency input RF and generates a modulated bias current to the...
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7206565 |
Device for generating wide tunable frequency using frequency divider
The present invention relate to a wideband frequency generating apparatus using a frequency dividing method of dividing a frequency signal of a voltage control oscillator to expand a frequency...
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7167698 |
Balanced sub-harmonic mixer
A wide band mixer is provided that mitigates local oscillator leakage. A LO signal is provided to a 180 degree splitter that provides a first intermediate LO signal and a second intermediate LO...
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7164329 |
Tunable phase shifer with a control signal generator responsive to DC offset in a mixed signal
The present invention provides a phase shifting filter and a phase compensating direct downconversion receiver. A DC offset detector detects a DC offset in a received baseband signal and provides a...
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7146149 |
High isolation switch buffer for frequency hopping radios
A local oscillator (LO) circuit is disclosed which provides improved isolation between the unselected LO source and a mixer. The LO circuit includes a first LO source to generate a first periodic...
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7130607 |
Adjusting a programmable mixer
A method for adjusting a programmable mixer of a local oscillation module to reduce local oscillation leakage begins by determining at least one of: DC offset of an input signal of the programmable...
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7107025 |
High gain, highly linear mixer
A high gain, highly linear mixer includes an input section, mixing section, at least one tuning component, and at least one stand by current source. The input section is operably coupled to receive...
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7085549 |
Dynamic power sharing zero intermediate frequency (ZIF) mixer and method of forming same
A zero intermediate frequency (ZIF) radio frequency (RF) digital mixer ( 200 ) includes a low noise amplifier (LNA) ( 203 ), a first RF mixer stage ( 205 ) for mixing an RF signal from the at least...
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7031748 |
Radio signal receiving apparatus and demodulating circuit
The object of this invention is to demodulate received signals having different received signal frequencies with the simple circuit configuration. With the present invention, the fixed frequency...
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7020451 |
Wideband multi-protocol wireless radio transceiver system
A wideband radio transceiver system that features a wideband RF section and a flexible and scalable baseband signal processing section. The transceiver system architecture has configurable baseband...
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6952572 |
Image rejection mixer with switchable high or low side injection
An image rejection mixer includes first and second mixers, a phase shift circuit and a summer. The first mixer receives an RF input signal and a first local oscillator (LO) signal and generates a...
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6892061 |
Mixer circuit configuration
A circuit configuration for mixing a differential desired signal with a differential local oscillator signal includes two difference amplifiers which are controllable on the input side by the...
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6871059 |
Passive balun FET mixer
A FET mixer uses a balun having a primary and secondary, with the primary coupled to an radio frequency signal input. The mixer also includes a pair of field effect transistors (FETs), wherein the...
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6871056 |
Non-radiative dielectric waveguide mixer using a ring hybrid coupler
Disclosed is a NRD waveguide mixer adopting a ring hybrid coupler applicable to a small-sized and high functional millimeter wave receiving/transmitting device. The NRD waveguide has a housing...
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6836650 |
Methods and systems for down-converting electromagnetic signals, and applications thereof
Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate...
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6826393 |
Mixer circuit having component for frequency conversion
A mixer circuit according to the present invention includes a first differential transistor pair of two transistors, a second differential transistor pair of two transistors, an impedance element...
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6810240 |
Analog multiplier
The analog multiplier has a MOS input stage. This makes it possible to increase the linearity range of the multiplier. In a development, a cascode circuit having an additional pair of bipolar...
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6782241 |
Radio device control terminal apparatus, radio system and multimedia system constitution method
A plurality of radio devices having a radio communication function establish a radio connection therebetween by exchanging their identifiers, and then exchange their information. Each radio device...
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6735421 |
Receiver including low noise amplifier and frequency down-converter for a wireless telecommunication system
A receiver ( 10 ) for a wireless telecommunications system that provides relatively wideband signal processing of received signals without increased signal distortion so that multiple received...
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6591093 |
Circuit and method for frequency translation
A mixer circuit ( 21 ) includes first ( 31 ) and second ( 32 ) transconductance amplifiers, a switching circuit ( 34 ), and an oscillator processing stage ( 36 ). The transconductance amplifiers (...
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6545516 |
Frequency conversion
A method for converting the frequency of an electrical signal, where an input signal is received, a first local signal and a second local signal of a different phase than the first local signal,...
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6484018 |
Method and apparatus for defining and generating local oscillator signals for down converter
A method and apparatus for defining and generating a digital waveform such as used for the local oscillator for a down converter in a receiver is disclosed. The method and apparatus is particularly...
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6397044 |
Transceiver
A transceiver for a portable radio communication apparatus comprising a receiver for receiving a signal at a received frequency and including a local oscillator, a transmitter being operable to...
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6275689 |
Double-balanced mixer
The double-balanced mixer includes a diode ring (D1, D2, D3, D4) with respective balancing circuit portions for a local oscillator signal (LO) and a high frequency signal (RF) and a...
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6272312 |
Satellite broadcasting receiving tuner which inhibits interference caused by satellite broadcast signals having one octave higher frequency band
A disturbance may be prevented from being caused in a satellite broadcasting signal of a reception target by a satellite broadcasting signal in which a frequency is higher by 1 octave. This...
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6263199 |
Circuit and method of signal frequency conversion
A mixer (20) has a differential transistor pair (22, 24) receiving first and second reference currents at first and second nodes (30, 34). An RF signal drives the differential transistor pair. A...
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6208214 |
Multifunction high frequency integrated circuit structure
A multifunction high frequency integrated circuit structure and circuit configuration includes a resonator or oscillator circuit coupled to a buffer amplifier by way of a stripline coupler. The...
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6205325 |
Active radio frequency mixer circuit with feedback
An active mixer circuit, and an associated method, includes a feedback element which increases the linearity of the mixer circuit so that the mixer circuit is operable over a wider dynamic range...
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6205324 |
Broadband double-balanced frequency mixer
The invention provides a broadband double-balanced mixer capable of operating across a range of frequencies from millimeter to microwave. The mixer includes a Wilkinson type splitter.
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6160425 |
Frequency converter
A frequency converter has both an up-conversion and a down-conversion circuit in a compact circuit design. The converter is operated as an upconverter by activating a first control FET, and is...
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6138000 |
Low voltage temperature and V.sub.cc compensated RF mixer
An RF mixer utilizing frequency and bias compensation for improved performance characteristics. The RF mixer receives bias signals that are dependent on V CC levels to internally balance the local...
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6122497 |
RF mixer with inductive degeneration
An RF mixer provides extended dynamic range with reduced noise by utilizing degeneration inductors in the RF input section of a doubly balanced mixer. Degeneration inductors are also utilized in a...
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6026286 |
RF amplifier, RF mixer and RF receiver
A low voltage silicon bipolar RF (radio frequency) receiver front end includes a low noise preamplifier and double-balanced mixer. The receiver incorporates monolithic microstrip transformers for...
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6011966 |
Mixer input circuit with Imbalance-balance circuit having distributed constant line
A mixer input circuit for converting a signal from a tuning section of an unbalanced type into a balanced signal and outputting the signal. In the mixer input circuit, an RF signal from an input...
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5960334 |
Amplifier and portable telephone apparatus using the same
An amplifier and a portable telephone apparatus using the same in which a resonance circuit is provided for each of different frequencies and bypass capacitors of the ground terminal of a...
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5809411 |
Radio pager housing having openings for replacing a crystal oscillator
A radio pager capable of changing the reception frequency thereof, as desired, and having a replaceable crystal oscillator. A reception frequency selecting device selects one of call signals having...
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5790945 |
Resonator for coupling intermediate frequency signals from a radio frequency mixer
A dumbbell shaped resonator efficiently couples IF signals from short transmission lines to an output transmission line at a radio frequency (RF) mixer's IF output port. The RF mixer uses short...
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5767726 |
Four terminal RF mixer device
A four terminal multiplication circuit capable of mixing up to three input signals. The circuit includes a MOS transistor having gate, source, drain and back-gate terminals. When the circuit is...
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5752180 |
Converter for processing RF signals having different polarizations
A radio frequency converter includes a plurality of signal paths for simultaneously processing two RF signals in the same band but with different polarizations, each of which includes a mixer and...
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5740528 |
Planar triply-balanced microstrip mixer
A planar triply-balanced microstrip mixer for microwave and millimeter wave operation includes an RF port, and IF port and an LO port. The mixer is constructed on a single side of a two-sided...
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5697095 |
Tuner capable of reducing power consumption and heat generation
There is provided a tuner capable of improving reliability thereof with reduced power consumption and reduced heat generation. In the tuner, one wideband amplifier circuit including one transistor...
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5678219 |
Integrated electronic warfare antenna receiver
An RF antenna and an associated receiver are proximately located in an integrated antenna/receiver unit thereby eliminating the need for baluns and inter-component cabling characteristic of prior...
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5606737 |
Oscillator mixer and a multiplier mixer for outputting a baseband signal based upon an input and output signal
In a structure adopted for an FM-CW radar, a corner waveguide for connecting each of transmission and reception antennas to a sensor unit is integrated with a sensor unit case. In a waveguide/strip...
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