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5485129 |
Method and apparatus for digital modulation using pulse deletion
An apparatus (500) for generating first and second output signals having predetermined frequency shifts relative to a frequency provided by a reference signal is included in a system comprising a...
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5483202 |
Compensated phase locked loop for generating a controlled output clock signal
A method and apparatus for generating a controlled output clock signal which is frequency and phase referenced to an input signal is disclosed. The compensation is programmable to allow an external...
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5483201 |
Synchronization circuit using a high speed digital slip counter
Simplifying measurement equipment so that any two frequency sources can be accurately and quantitatively compared to each other. With this simplified measurement equipment, calibration can be...
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5483558 |
Method and apparatus for detecting phase or frequency lock
A lock detection circuit (112) includes a first sampler (113) which samples an input signal (102) at a rate of an output signal (109) to provide a sampled input signal. A second sampler (114) which...
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5483204 |
Clock circuit
A clock circuit for supplying an output clock signal to a logic circuit, includes a phase difference-to-voltage converter producing a voltage signal corresponding to a phase difference between a...
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5483559 |
Phase-locked loop device, oscillator, and signal processor
A PLL device includes a VCO (10) forming a phase-locked loop and an amplifier (18) for outputting a phase change signal having phase function with respect to frequencies, a synthesizer (20) having...
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5477196 |
Pulse generator
In a device for encoding a pulse phase difference or controlling an oscillation frequency based on delayed signals sequentially output by a delay circuit, the encoding of a pulse phase difference...
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5475344 |
Multiple interconnected ring oscillator circuit
An array oscillator circuit is disclosed herein. The array oscillator circuit includes a plurality of ring oscillators, each ring oscillator having a plurality of buffer stages for generating...
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5473285 |
Method and apparatus for performing phase acquisition in an all digital phase lock loop
A method and apparatus for performing, after frequency acquisition, phase acquisition and phase maintenance in a digital phase-locked loop 10. A phase detector (12), determines the phase relation...
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5471176 |
Glitchless frequency-adjustable ring oscillator
A clock generation circuit includes a reference clock for putting out a stable reference clocking signal. A digital ring oscillator includes a series circuit loop having at least one inverting gate...
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5469478 |
Digital phase lock loop for jitter filtering and frequency offset compensation
A digital phase lock loop for producing an output signal based on an input signal which is subject to jitter and frequency offset. The output signal follows the center of the jitter on the input...
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5465268 |
Digital decoding of biphase-mark encoded serial digital signals
A digital decoder for a biphase-mark encoded serial digital signal detects edges in the encoded serial digital signal by sampling with a sample clock to produce a blivet signal. The blivet signal...
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5463351 |
Nested digital phase lock loop
A nested digital phase lock loop (DPLL) circuit (400) provides center bit sampling for incoming recovered data (406). Included in the nested DPLL circuit (400) are a narrow bandwidth DPLL (402) and...
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5461344 |
Phase lock loop frequency synthesizer
A phase lock loop frequency synthesizer is applied to radio communication devices or the like, in order to reduce frequency error at a time of frequency changing, and considerably reduce a...
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5461345 |
Frequency synchronous circuit for reducing transition period from power on state to stable state
A frequency synchronous circuit has a first selection unit, a first counter unit, a second counter unit, a storage/average unit, and a comparison unit. The first selection unit is used to select...
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5459435 |
Frequency synchronous circuit for obtaining original clock signal by removing noise components
A frequency synchronous circuit has a first counter unit, a second counter unit, a storage/average unit, and a comparison unit. The first counter unit is used to count a reference signal supplied...
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5457428 |
Method and apparatus for the reduction of time interval error in a phase locked loop circuit
A phase-locked loop circuit which utilizes multiple reference signals is formed with control circuitry to minimize time interval error. The phase-locked loop (PLL) comprises a switching device,...
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5451911 |
Timing generator
A timing generator contains an oscillator section (10) formed with a plural number of stages (S 1 -S N ) for respectively producing a like number of stage signals (V S1 -V SN ) that sequentially...
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5451910 |
Frequency synthesizer with comb spectrum mixer and fractional comb frequency offset
A frequency synthesizer has the configuration of a phase locked loop (PLL) having a voltage controlled oscillator (VCO) generating an output signal, a phase detector for outputting a control signal...
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5450137 |
Signal processing apparatus
This specification concerns signal processing apparatus for processing line synchronization pulses in a line synchronization signal that define an analog video signal line period. The apparatus...
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5450447 |
Adaptive variable-gain phase and frequency locked loop for rapid carrier acquisition
An apparatus and method for improving the performance of a satellite communications modem is disclosed. The invention is particularly applicable to mobile satellite receivers, and includes a...
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5444420 |
Numerically controlled phase lock loop synthesizer/modulator and method
A phase lock loop (PLL) circuit and method in which a PLL circuit locks on a variable input phase by providing an instantaneous phase value of a signal from an oscillator at periodic intervals, and...
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5442324 |
Digital-controlled oscillator
Briefly, in accordance with one embodiment of the invention, an electrical circuit comprises: a digital-controlled oscillator. The digital-controlled oscillator includes an edge delay oscillator...
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5442325 |
Voltage-controlled oscillator and system with reduced sensitivity to power supply variation
The voltage-controlled oscillator (VCO) of the present invention is designed with reduced sensitivity to power supply voltage variations. The VCO includes multiple inverter stages with dc supply...
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5440274 |
Phase detector circuit and PLL circuit equipped therewith
A phase detector circuit (10) for generating an analog signal (VR) dependent upon the phase difference between two digital signals (VE, VA) includes two NOR circuits (20, 27) to the inputs (18, 26;...
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5440275 |
Marker sweep linearization system and method
A multi-marker microwave sweep linearization system comprising a voltage controlled microwave oscillator utilizing an adaptive sweep control circuit is presented. The oscillator control voltage is...
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5438299 |
Phase-locked loop circuit
A PLL circuit comprising a phase comparator unit which forms a differentiation signal based upon both edges of an external signal, outputs an early pulse only during a period in which the...
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5438300 |
Digital frequency multiplier utilizing digital controlled oscillator
A frequency multiplier includes a ring oscillator having a number of logic gates arranged in a plurality of rings. Control inputs enable the selection of individual gates so as to connect them into...
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5436598 |
Phase lock loop circuit for signals periodically inverting in phase
A phase lock loop (PLL) circuit which includes an input for inputting an incoming signal which is to be tracked, a phase lock loop subcircuit, a phase state indicator subcircuit, and a synchronized...
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5436596 |
PLL with stable phase discriminator
A phase-locked-loop (PLL) with stable phase discrimination includes a charge pump with a current source and current sink to control a VCO, and a phase discriminator to compare the VCO's signal to a...
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5436938 |
Phase error detector for a phase locked loop
A phase lock loop (PLL) arrangement includes a voltage controlled ring oscillator (VCRO) including delay elements whose delay is controlled by a control voltage produced by the PLL. A phase error...
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5436597 |
Pro-capture circuit for phase locked loop circuits
A pro-capture circuit for a phase locked loop detects when the phase locked loop is operating outside of its operating range, and then forces the phase locked loop back into the proper range. The...
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5434545 |
Fully differential voltage controlled oscillator
A fully differential voltage controlled oscillator having a large common mode rejection ratio is disclosed with a first and a second phase detector disposed between the output of a differential...
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5428317 |
Phase locked loop with low power feedback path and method of operation
A phase locked loop (10) has a first (24) and a second (28) feedback path by which a generated clock signal may be phase and frequency matched to an input reference clock signal. The two feedback...
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5426397 |
Phase detector for a phase-lock-loop
A phase-lock-loop circuit for generating a clock signal at a frequency higher than a horizontal frequency of a video signal includes a phase detector. The phase detector includes a flip-flop that...
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5424689 |
Filtering device for use in a phase locked loop controller
A phase lock loop (PLL) frequency synthesizer is used in a radiotelephone to provide a reference frequency to a transmitter or a receiver. This particular PLL frequency synthesizer has a wide...
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5422603 |
CMOS frequency synthesizer
A fully-symmetric high-speed CMOS frequency synthesizer which exhibits minimum dead-zone effects is disclosed. A fully-symmetric phase-frequency detector and a fully differential charge-pump filter...
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5420546 |
Variable frequency oscillator having an output frequency that is controllable
A digitally controllable oscillator is provided with a variable-frequency ring oscillator including an odd number of inverting circuits connected together in a ring formation. The oscillator has a...
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5420543 |
Method and apparatus for determining a constant gain of a variable oscillator
A method and apparatus for implementing a constant gain in a digitally-controlled variable oscillator (DCO) 16 where the frequency of the DCO 16 is controlled via binary-weighted control signals....
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5420544 |
Semiconductor integrated circuit, method of designing the same and method of manufacturing the same
A skew due to distribution of a clock inside a gate array is reduced. Phase comparators (14A), (14B) and (14C) are prepared in the peripheral portion of an internal circuit 71. The phase comparator...
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5416803 |
Process for digital transmission and direct conversion receiver
The transmitter uses a synthesized oscillator (1A) whose reference (24) is provided by the clock (H) of the data (P, Q). The demodulation oscillator (13A) of the receiver is a synthesizer which is...
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5416446 |
Digital programmable frequency generator
Frequency generators that may be programmed are utilized in a wide variety of applications. Typical applications include radio and television receivers and transmitters, and computer devices that...
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5412349 |
PLL clock generator integrated with microprocessor
A PLL based deskewed clock generator which may be fully integrated on a microprocessor is disclosed. The clock generator has a skew of less than 0.1 ns with peak to peak jitter of 0.3 ns using a...
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5410573 |
Digital phase-locked loop circuit
A digital phase locked loop which incorporates a phase comparator which produces a phase deviation signal having a sinusoidal phase comparison characteristic rather than a sawtooth phase comparison...
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5408200 |
Intelligent phase detector
A system and method for a computer based system for enabling data phase clock corrections. Basing these corrections primarily on errors that cause consistent phase shift errors while reducing the...
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5406228 |
Ring oscillator with frequency control loop
An oscillator system and method in which a time period (inverse of frequency) of a multi-stage ring oscillator (ROSC) is adjusted by a bias current which controls the charging and discharging times...
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5406591 |
Frequency synthesizer and frequency synthesizing method
A frequency synthesizer and a frequency synthesizing method are disclosed. They are used to achieve frequency switching in a short time even though the switched width of an output frequency signal...
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5399995 |
CMOS circuit providing 90 degree phase delay
A high speed clock recovery system that provides a precise 90° phase shift at the incoming NRZ data rate by using a series of differential inverters and controlling their delays in accordance with...
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5398006 |
Method and apparatus for automatic loop control
A method of automatically controlling a loop comprising the steps of applying an input signal and an error correction signal to a signal correction circuit to provide a digital corrected signal....
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5394114 |
One nanosecond resolution programmable waveform generator
Generation of clock waveforms which have a frequency, phase offset, and duty cycle that is relative to a periodic reference signal. The outputs of a voltage controlled ring oscillator are directly...
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