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WO/2004/025441A1 |
A precision oscillator for an asynchronous transmission system. An integrated system on a chip with serial asynchronous communication capabilities includes processing circuitry for performing predefined digital processing functions on th...
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WO/2004/008639A2 |
A current-controlled ring oscillator (300) uses a single controlled-current supply for supplying current to each inversion stage (110) of the ring oscillator (300). The controlled current is dynamically adjusted to compensate for variati...
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WO/2003/073629A1 |
A method and apparatus for compensating an oscillator (108) in a location-enabled wireless device (102) is described. In an example, a mobile device (102) includes a wireless receiver (104) for receiving wireless signals (118) and a GPS ...
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WO/2003/067356A1 |
An apparatus and method for stabilizing the frequency of a piezoelectric crystal resonator, especially useful in common emergency positioning radio beacons. A temperature compensated crystal oscillator circuit (TCXO) (20) is mounted on o...
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WO/2003/065585A1 |
A wireless transceiver includes a transmitter having a harmonic rejection mixer and an RF output phase-locked loop in a two step up-conversion architecture, and a direct conversion receiver. The transmitter includes a local oscillator fo...
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WO/2003/063335A1 |
A temperature compensation type oscillator comprising an oscillating circuit (20), a temperature determining circuit (18), and a temperature compensating circuit (30) for keeping, based on a temperature determination signal from the temp...
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WO/2003/054638A1 |
A timing reference system is provided for correcting inaccuracies in an output of a crystal oscillator experienced by the crystal oscillator during use in a mobile platform. The system utilizes a three-axis accelerometer mounted adjacent...
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WO/2003/026132A2 |
An electronic circuit comprising a frequency or phase-locked loop (PLL) comprising a first input terminal (1) coupled to receive a first input signal (D); a second input terminal (2) coupled to receive a second input signal (CLK); detect...
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WO/2003/021765A1 |
An oscillator (10) comprises temperature compensation circuits (30) and (40), a frequency adjustment circuit (50), and an initial deviation correction circuit (60). A temperature compensation voltage (V1), a temperature compensation volt...
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WO/2002/097989A1 |
Based on an initial crystal coefficient value, a processor generates a control signal for a frequency synthesizer. The processor estimates a new crystal coefficient value based on a comparison of the frequency of the output of the freque...
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WO/2002/093748A1 |
A receiver uses an adaptive algorithm to tune a low-cost crystal oscillator according to a temperature compensation profile so as to produce a precision master reference frequency despite temperature, initial tolerance, and aging effects...
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WO/2002/087016A1 |
A family of FE dielectric-tuned antennas and a method for frequency tuning a wireless communications antenna are provided. The method comprises: forming a radiator (106); forming a dielectric with ferroelectric material proximate to the ...
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WO/2002/087082A1 |
The present invention provides for low loss tunable matching circuits at rf frequencies. Ferro-electric materials are used to produce low loss tunable capacitors and inductors for use in matching circuits.
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WO/2002/084684A2 |
A tunable capacitor that introduces significantly less loss, if any, costs less and is smaller than previously available. A bias electrode (14) is coupled to a FE material (16). The capacitor electrodes (21, 24) are electro−magneticall...
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WO/2002/084858A1 |
A crystal oscillator having tunable ferroelectric components. A first ferroelectric capacitor is coupled to an automatic frequency control line for fine tuning the reference frequency. A second ferroelectric capacitor is coupled to tempe...
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WO/2002/084857A1 |
A voltage controlled oscillator incorporating a ferroelectric capacitor in its resonant circuit is provided in order to provide superior phase noise performance and a linear control voltage/capacitance relationship. The resonant circuit ...
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WO/2002/084798A1 |
An inverted-F ferroelectric antenna is provided. The antenna comprises a counterpoise, or groundplane (102), and an inverted-F structure radiator (104) having a first end (106) connected to the counterpoise. A fixed dielectric material (...
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WO/2002/084778A2 |
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 feedback signal. A tunable filter phase...
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WO/2002/084310A1 |
A tunable ferroelectric component (610-614) and a narrowband resonant circuit (610-620) for measuring the loss of the ferroelectric component. The ferroelectric component may be a capacitor integrated in the resonant circuit. The testing...
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WO/2002/084685A1 |
The present invention quantifies and reduces losses in tunable bandpass filters having ferro-electric capacitors. Given a required insertion loss and the quality factor of a resonator, the geometric losses resulting from a particular top...
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WO/2002/084781A1 |
The present invention provides a tunable ferro-electric multiplexer for use in CDMA communication devices. Tunable ferro-electric capacitors are used to tune the resonant frequencies of several resonators used in a multiplexer and to tun...
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WO/2002/084686A1 |
A ferro-electric filter and method of tuning same. The filter includes a switch for switching between quarter wave resonator and half wave resonator modes. The filter also includes a ferro-electric component for tuning the resonant frequ...
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WO/2002/082656A2 |
A frequency-adjustable oscillator suitable for digital signal clock synchronization comprises a crystal oscillator circuit for generating a driving signal and having a voltage-variable control input for adjusting a frequency of the drivi...
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WO/2002/065639A1 |
A LC controllable oscillator (LCCO) according to the invention comprises a voltage-controlled oscillator VCO (102) and a first voltage controlled current source VCCS (101) of a first type for supplying a current to the VCO. The VCO is re...
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WO/2002/051012A1 |
An oscillating circuit (10) includes a quartz crystal oscillator (12) for generating a clock signal (20). The clock signal is synchronized to a master signal (19) during the lock-in periods when the oscillating circuit (10) has access to...
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WO/2002/049203A2 |
A precision oven-controlled crystal oscillator (10) uses an adjustment feedback signal that, when mixed with a reference signal from a stable reference oscillator (32), accurately controls the generation of an output signal from a voltag...
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WO/2002/033826A2 |
An ovenized oscillator (10) has two ovens (20,50). One (50) of the ovens is heated by a heater (54) and the other (20) is cooled by a thermoelectric module (29). The ovenized oscillator has an inner oven (20) with an oscillator (26) loca...
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WO/2002/027915A1 |
A temperature compensated crystal oscillator using an AT cut crystal produces a reference frequency. The temperature compensated crystal oscillator is located inside a temperature controlled oven. The temperature controlled oven provides...
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WO/2002/017050A2 |
A clock generator for automatic test equipment generates clock signals from a reference clock. To generate a desired clock signal, a clock generator produces a time-quantized signal having a period equal to an integer number of reference...
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WO/2001/097383A2 |
The invention relates to the creation of a precise frequency standard (5) in an integrated circuit, by activating a reference oscillator (6) at specific intervals and by calibrating the local oscillator (2). To achieve this, a calibratio...
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WO/2001/086316A2 |
The frequency error of an oscillator is minimized by characterizing the oscillator. A reference signal from an external source containing a minimal frequency error is provided to an electronic device. The external signal is used as a ref...
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WO/2001/069773A1 |
A voltage controlled crystal oscillator (VCXO) (25), for example, as used in a mobile communications terminal (23), has its output frequency F¿ref? stabilised against temperature drift using frequency correction information received, fo...
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WO/2001/061856A1 |
A system and method for programming (1-7) a digitally tunable oscillator (2) is provided. A desired output frequency is received. A tuning effect of a set of digital tuning words on a crystal (2) resonant frequency is determined (3), and...
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WO/2001/035533A1 |
A device and method for production of a signal of constant frequency are disclosed. Said device comprises an integrator and an adjustable oscillator. Said integrator is for integration of an input current, whereby the integrator serves a...
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WO2000031870A9 |
Methods and systems are provided for frequency generation suitable for use in wireless devices capable of operating at multiple frequencies. Such systems may change the loop gain of an automatic frequency control loop based on the operat...
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WO/2001/022592A1 |
The invention relates to a device and a method for temperature compensation via the determination of cut-angles of a master and a slave crystal (mc, sc) employed in a master and slave oscillator (m, s). When the master and the slave osci...
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WO/2001/020862A1 |
A method for synchronising a local reference frequency in a mobile station includes measuring a current ambient condition of the mobile station and using stored data indicating variance of the local reference frequency with known ambient...
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WO/2000/076069A2 |
Several calibration techniques for a precision relaxation oscillator with temperature compensation produces a stable clock frequency over wide variations of ambient temperature. The calibration techniques provide for different methods of...
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WO/2000/074233A1 |
An IF VGA utilizes distorsion cancellation achieved with cross coupled differential pair amplifiers having their VDs dynamically modified in conjunction with current steering of the differential pairs sources.
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WO/2000/072446A1 |
An integrated VCO (4532) having an improved tuning range over process and temperature variations. There is therefore provided in a present embodiment of the invention an integrated VCO. The VCO comprises, a substrate, a VCO tuning contro...
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WO2000036745A9 |
A precision relaxation oscillator with temperature compensation produces a stable clock frequency over wide variations of ambient temperature. The invention has an oscillation generator (100), two independent current generators (200, 300...
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WO/2000/055972A1 |
The invention relates to a method of generating a control signal and to an arrangement comprising a D/A converter (20) for receiving a digital signal and converting the received signal into an analog control signal. The arrangement compr...
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WO/2000/038323A1 |
A frequency synthesizer module with temperature compensation of a crystal oscillator circuit (12) frequency controlled by a varactor (14). A module memory (18) contains information characterizing a temperature dependency of a crystal (10...
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WO/2000/028665A1 |
A radio communication device, which transmits or receives a signal at a predetermined carrier frequency. The device includes a reference oscillator (24), which generates a clock frequency having a clock frequency error relative to a spec...
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WO/2000/024128A1 |
A stabilized oscillator system (202) comprises an oven controlled crystal oscillator (204) positioned inside an insulating housing. Within the insulating housing, there is a cold plate (206) in thermal contact with the oven controlled cr...
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WO/2000/005818A1 |
The invention concerns a circuit whereof the operational speed varies according to temperature, supply voltage and the intrinsic quality of the circuit transistors, associated with a compensating circuit comprising a constant current sou...
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WO/1999/057814A2 |
A phase frequency detector comprises means for providing Up/Down signals in order to detect a phase difference between detector input signals, and output control means having Up/Down signal inputs for providing a detector output signal c...
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WO/1999/056387A1 |
A temperature compensated crystal oscillator with an improved phase noise characteristic and a fast start up time includes a large time constant low-pass filter coupled to a temperature compensation circuit (14). At start up the low pass...
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WO/1999/056395A1 |
The invention is aimed at detecting the dependence of oscillation frequency on temperature during perfect operation of the automatic frequency corrector (AFC), storing information relevant thereto and using said information in phases in ...
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WO/1999/052214A2 |
A communications device, such as a one-way pager, comprises a receiver having a frequency down-conversion means for frequency converting an input signal using a local oscillator signal generated by a signal generating means, which may co...
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