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8174328 |
Dual-band wideband local oscillation signal generator
A dual-band wideband local oscillation signal generator includes an oscillation unit, a division unit, a poly phase filter (PPF), a switch unit, and a single side band (SSB) mixer. The oscillation...
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8169266 |
Mixer circuits and methods
Embodiments of the present invention include circuits and methods for improving the spectral purity of mixer circuits. In one embodiment the present invention includes a mixer circuit comprising a...
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8120433 |
Multi-output oscillator using single oscillator
Provided are a multi-output oscillator using a single oscillator, and a method of generating multiple outputs. The multi-output oscillator includes: an oscillator outputting the single frequency; a...
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8116677 |
Adaptive radio transceiver
An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a...
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8031010 |
Ruggedized chip scale atomic clock
The present invention is a Chip Scale Atomic Clock (CSAC)-enabled Time and Frequency Standard (CTFS) architecture. The CTFS architecture includes a microcontroller, a Time Compensated Crystal...
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7986192 |
Harmonic rejection mixer and harmonic rejection mixing method
Provided are a harmonic rejection mixer and a harmonic rejection mixing method. A plurality of oscillator signals having a ⅓ duty cycle and uniform phase differences may be generated and a d...
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7970358 |
Adaptive radio transceiver with a local oscillator
An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a...
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7925222 |
Method and system for simultaneous FM transmission and FM reception using a shared antenna and a direct digital frequency synthesizer
Certain aspects of a method and system for simultaneous FM transmission and FM reception using a shared antenna and a direct digital frequency synthesizer (DDFS) may be disclosed. In a FM...
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7809338 |
Local oscillator with non-harmonic ratio between oscillator and RF frequencies using wideband modulation spectral replicas
A novel and useful apparatus for and method of local oscillator (LO) generation with non-integer multiplication ratio between the local oscillator and RF frequencies. The LO generation schemes...
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7805122 |
Local oscillator with non-harmonic ratio between oscillator and RF frequencies using digital mixing and weighting functions
A novel and useful apparatus for and method of local oscillator (LO) generation with non-integer multiplication ratio between the local oscillator and RF frequencies. The LO generation schemes...
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7783251 |
Adaptive radio transceiver
An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a...
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7778610 |
Local oscillator with non-harmonic ratio between oscillator and RF frequencies using XOR operation with jitter estimation and correction
A novel and useful apparatus for and method of local oscillator (LO) generation with non-integer multiplication ratio between the local oscillator and RF frequencies. The LO generation schemes...
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7756487 |
Local oscillator with non-harmonic ratio between oscillator and RF frequencies using pulse generation and selection
A novel and useful apparatus for and method of local oscillator (LO) generation with non-integer multiplication ratio between the local oscillator and RF frequencies. The LO generation schemes...
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7756472 |
Adaptive radio transceiver with filtering
An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a...
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7728684 |
Crystal reference clock and radio localization receiver
Device and method for temperature compensation in a clock oscillator using quartz crystals, which integrates dual crystal oscillators. The minimal power consumption is achieved through an efficient...
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7701299 |
Low phase noise PLL synthesizer
A low phase noise PLL synthesizer is described in which an initial tuning mechanism uses a conventional divider loop to lock a VCO to a desired output frequency. Once initial lock is achieved, the...
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7701300 |
Multi-frequency synthesizing apparatus and method for multi-band RF receiver
A frequency synthesizing apparatus and method for a multi-band radio frequency (RF) receiver is provided. The frequency synthesizing apparatus includes a simple circuit configuration with a single...
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7652542 |
Signal generator, and transmitter, receiver and transceiver using same
A signal generator generates a first internal signal including frequency f1, a second internal signal including frequency f2, and a third internal signal including frequency f3 twice as high as...
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7598815 |
Multiple frequency generator for quadrature amplitude modulated communications
Multiple carrier frequencies are provided from a phase locked loop, especially closely adjacent quadrature amplitude modulated subcarriers for multiplexed data communications. A quadrature voltage...
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7558556 |
Adaptive radio transceiver with subsampling mixers
An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a...
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7411461 |
Frequency and/or phase lock loops with beat frequency estimation
A control loop (10) for producing an output signal with a stable nominal frequency is provided. The control loop includes inputs for reference (11) and oscillator (25) output signals, a beat...
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7321268 |
Ultra wideband and fast hopping frequency synthesizer for MB-OFDM wireless application
A frequency synthesizer with a single PLL and multiple SSB mixers is presented. The frequency synthesizer includes a single PLL outputting a reference signal that is fed to a plurality of dividers...
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7319366 |
Offset local oscillator without using frequency divider
A local oscillator without a frequency divider is provided. The local oscillator includes a quadrature voltage controlled oscillator generating I and Q signals having a frequency which is one-third...
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7289783 |
Mixer circuits and methods with matched bias currents
Embodiments of the present invention include circuits and methods for improving the spectral purity of mixer circuits. In one embodiment the present invention includes a mixer circuit including a...
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7136622 |
Adaptive radio transceiver with noise suppression
An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a...
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7046099 |
Temperature compensated oscillator
An oscillator having a desired output frequency, comprising a cavity resonator 102 loaded with an anisotropic dielectric material and an oscillator circuit 100 including the cavity resonator 102 as...
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6960962 |
Local oscillator leakage control in direct conversion processes
A system and method for generating a local oscillator (LO) frequency in a zero intermediate frequency (IF) receiver or transmitter is presented. A signal is received from a voltage controlled...
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6850121 |
TDMA transmit frequency generator suppressing frequency jumps caused by feedback
A transmit frequency is generated for a transceiver by a controllable oscillator which generates an oscillator frequency, a divider by a factor N, and a mixer stage with a subsequent band filter....
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6842049 |
Method of and apparatus for detecting difference between the frequencies, and phase locked loop circuit
An apparatus for detecting a difference between frequencies includes a beat waveform generator which generates a beat waveform signal having a frequency which is equal to a difference between...
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6689670 |
High-frequency module
In a high-frequency module according to the present invention in which a conductive cap for an electromagnetic purpose is placed on a substrate on which a plurality of electrical components are...
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6570458 |
Low noise microwave synthesizer employing high frequency combs for tuning drift cancel loop
A microwave synthesizer includes a drift-cancel loop having a narrow-band input, a low-frequency comb input, a wide-band input, and an output for providing an adjustable-frequency output signal. A...
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6459341 |
Voltage controlled oscillation device
A voltage controlled oscillation device includes a voltage controlled oscillator, fixed-frequency oscillator, frequency mixer, and frequency selector. The voltage controlled oscillator changes the...
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6345175 |
Apparatus and method for preventing beat interference
Interference in a receiver caused by a beat frequency arising from mutual interference of local oscillation signals from other, proximately located receivers is prevented by changing over between...
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6133795 |
Oscillator circuit
A stabilised voltage controlled oscillator circuit comprises a closed loop circuit containing a voltage controlled oscillator (34), a local oscillator (40) and a harmonic mixer (38) that mixes a...
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6005446 |
Microwave frequency synthesizer
An apparatus and method for synthesizing low-noise, high stability, multi-frequency microwave signals is disclosed. The output frequencies of a lower frequency, low-noise, synthesizer are...
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5623233 |
Pulsed optically injection locked MESFET oscillator
An optically controlled MESFET semiconductor oscillator assembly having a MESFET semiconductor which, when voltage biased by a pulsed dc voltage, oscillates at a free running frequency; an optical...
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5508661 |
Fast tuning YIG frequency synthesizer
A frequency synthesizer using a fixed oscillator driving a comb line generator to generate a spectrum of comb lines, one of which is selected by a switched array of fixed-tuned, YIG passband...
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5463356 |
FM band multiple signal modulator
Apparatus and a method for generating all of the assignable carrier frequencies in the FM broadcast band and for frequency modulating the generated carriers includes a generator of a train of...
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5341111 |
Microwave oscillator circuit
A microwave oscillator circuit is provided for decreasing the number of passive elements such as inductance, etc. in microwave oscillators and frequency doublers. A microwave oscillator circuit is...
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5309116 |
Multimode crystal oscillator
A multimode oscillator is disclosed which employs a single gain loop for exciting at least two modes of a resonator to cause the oscillator to oscillate simultaneously at at least two frequencies....
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5307029 |
Method and apparatus for generating multiple frequency tones using a digital frequency divider
Generation of multiple, harmonically related frequency outputs is achieved using a digital asymmetrical harmonic waveform generator, such as a high speed digital frequency divider, for example. The...
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5166645 |
Differential mixer oscillator
A differential mixer oscillator employing two transistors in a differential pair as the sustaining amplifier for a quartz crystal resonator at some first high frequency. The bias current of the...
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4965534 |
Channel frequency generator for use with a multi-frequency output generator
An apparatus and method is disclosed which phase locks a frequency-agile modulated output signal to any selected channel of a comb generated output. The phase error of an input signal is tracked,...
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4872765 |
Dual mode quartz thermometric sensing device
A circuit is shown for representing the internal temperature of a crystal, through a combination of certain harmonic frequencies excited in that crystal. By forming a signal which is equal to nFA...
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4769621 |
Frequency divider with darlington transistors
A frequency divider is disclosed that includes two bipolar transistors coupled as a Darlington pair, where the base of the first transistor receives an input signal to be divided, and where the...
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4688005 |
Self-oscillating mixer with Darlington transistors
A self-oscillating mixer is disclosed, and includes two bipolar transistors coupled as a Darlington pair, where the base of the first transistor receives an input signal, and where the common...
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4575688 |
Tracking oscillators
The output signal frequencies of two current controlled oscillators are made to track closely by matching timing currents with a current mirror. A frequency difference between the output signals is...
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4536719 |
Inductive pressure sensor using two oscillators
An inductive pressure sensor is proposed which has at least one coil embodying a frequency-determining part of an oscillator and disposed at a distance from a diaphragm which is deflectable in...
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4503403 |
Optical injection locking of solid-state oscillators by frequency-multiplexed injection-locked, laser diodes
The optical injection-locking of an FET oscillator is accomplished by injecting the beat signal between two coherently mixed slave lasers, which are locked to different harmonics of a modulated...
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4427952 |
Oscillator circuit with digital temperature compensation
The oscillator circuit comprises a digital temperature compensation circuit connected to a low and a high frequency quartz oscillator. The two quartz oscillators have the same inversion temperature...
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