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5896066 |
PLL synthesizer having a reset circuit
A PLL including a phase comparator, a VCO, and a charge pump further includes a reset circuit. The reset circuit detects whether both of the charge pump transistors are in an ON state, and if so,...
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5894247 |
Optical PLL circuit and method of controlling the same
An optical PLL circuit with high precision that has its simplified configuration. An optical-intensity modulator creates difference frequency information (N×Δf) by modulating a received optical...
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5889435 |
On-chip PLL phase and jitter self-test circuit
An ASIC includes a PLL and digital circuitry to quantize and measure phase and average maximum jitter between a system clock input to the PLL, and a PLL-generated clock signal. The system clock is...
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5889437 |
Frequency synthesizer with low jitter noise
An improved apparatus for combining frequencies which is capable of generating a constant frequency when an external variation is applied thereto by implementing each block using a differential...
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5889440 |
Adaptive frequency compensation technique
The frequency of a clocking signal is adjusted in response to fluctuations in the power supply voltage. In one embodiment, a control circuit has a plurality of clock input terminals each coupled...
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5886582 |
Enabling clock signals with a phase locked loop (PLL) lock detect circuit
A circuit for enabling and disabling generation of an output clock signal is disclosed. The circuit includes a PLL lock detect circuit that generates an active lock control signal when an output...
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5877658 |
Phase locked loop
A phase locked loop comprises a voltage controlled oscillator, a 1/n frequency demultiplier, a phase comparator, and a modulation circuit. The phase comparator is supplied with a first signal which...
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5874863 |
Phase locked loop with fast start-up circuitry
A phase-locked loop (PLL) circuit has a phase comparator for comparing the phases of a local clock frequency and a reference frequency to generate a control signal indicative of a direction of...
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5872487 |
Fast frequency switching synthesizer
A frequency synthesizer that can switch an output frequency fast and generates little spurious output is provided. This frequency synthesizer comprises a phase locked loop including a...
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5872486 |
Wide-range fine-step vector modulator frequency synthesizer
A frequency synthesizer comprises a voltage controlled oscillator (VCO) with an output frequency f out that is dependent on a VCO-control voltage input. A divide-by-k counter is connected to...
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5870002 |
Phase-frequency lock detector
A method and circuitry for detecting when a PLL achieves phase and frequency-lock to a reference frequency with minimal hardware and power dissipation are disclosed. The invention takes advantage...
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5867068 |
Frequency synthesizer using double resolution fractional frequency division
A fractional frequency synthesizer (100) includes a symmetrical divider (165) having an output frequency signal (135) fractionalized based on half cycles of its input frequency signal (130). The...
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5861766 |
Multimode frequency synthesizer having high loop gain in frequency seek mode
A frequency synthesizer has multiple modes of operation including a relatively short-duration frequency seek mode and a relatively long-duration normal mode. The synthesizer responds to a reference...
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5856761 |
PLL frequency synthesizer using plural phase comparators and frequency dividers
A PLL frequency synthesizer for realizing high-speed operation in a frequency synthesizer having a small channel interval Δf. There are provided n-number of phase comparators, feedback frequency...
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5854576 |
Method and apparatus for a finely adjustable clock circuit
A method and apparatus for generating a finely adjustable clock is accomplished by a ring oscillator, a plurality of counting circuits, and a controller. The ring oscillator generates a plurality...
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5854575 |
Dual-loop phase-locked loop
An integrated circuit phase-locked loop includes a phase/frequency detector, a charge pump, and a voltage-controlled oscillator (VCO) which are coupled together in series. The VCO has first and...
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5847617 |
Variable-path-length voltage-controlled oscillator circuit
A variable-path-length voltage-controlled oscillator circuit is provided. The oscillator circuit has a ring oscillator formed from a series of voltage-controlled inverter stages. The path length...
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5847611 |
Fractional divided frequency synthesizer with phase error compensating circuit
In a frequency synthesizer, a variable frequency divider divides the oscillation signal of a VCO while switching the frequency dividing ratio in accordance with an integral frequency dividing ratio...
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5838203 |
Method and apparatus for generating waveforms using adiabatic circuitry
A method and an apparatus for generating oscillating waveforms using adiabatic circuitry. In one embodiment, an LC oscillating circuit generates oscillating waveforms that are replenished with...
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5838202 |
Error suppressing circuit and method therefor for a phase locked loop
An error suppressing circuit (301) and method therefor for a phase locked loop (PLL) (300). According to one embodiment of the present invention, a transient condition, for example, a bandwidth...
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5835544 |
Clock signal reproduction circuit and data reproduction circuit
A clock signal reproduction circuit including an A/D conversion circuit for converting an input RF analog signal with a restricted upper limit of a frequency band into a digital signal, a digital...
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5836000 |
Phase locked loop having automatic free running frequency adjustment
The capture range and stability of a phase locked loop are improved by adjusting the free running frequency of a voltage controlled oscillator in response to the output signal of the phase locked...
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5834980 |
Method and apparatus for supplying synchronization signals securing as clock signals with defined phase relationships
A method and apparatus for recovering the time base of signals which change at periodic intervals is disclosed. The apparatus comprises gated voltage controlled oscillators (GVCO) that are...
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5831481 |
Phase lock loop circuit having a broad loop band and small step frequency
A phase lock loop circuit includes an oscillator, a digital mixer, a comparator, a loop amplifier, and a low-pass filter. The oscillator has an oscillation frequency controlled by a control...
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5828253 |
Phase synchronization system which reduces power consumption and high frequency noise
The invention provides a phase synchronization system which stops, when an input of a phase reference signal from the outside stops, oscillation of a voltage-controlled oscillator to achieve...
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5825226 |
Delay equalization apparatus and method
A delay equalization circuit for minimizing the static phase error in a PLL is provided. The delay equalization circuit includes an external clock signal variable delay path, and an element for...
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5825253 |
Phase-locked-loop with noise shaper
A phase lock loop wherein the reference clock is divided by a variable divider which is capable of dividing the reference clock by a divider ratio of 2, 3, 4, . . . or M depending on the value of a...
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5821816 |
Integer division variable frequency synthesis apparatus and method
A variable frequency synthesis apparatus and method use a phase prediction signal to enable integer division in the feedback path of a phase-lock-loop to provide an output signal at a rational...
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5821817 |
Fast-locking low-noise phase-locked loop
A phase-locked-loop device for generating an output signal of frequency Fo, n phase-lock with an input signal of frequency Fi, where Fo=N(Fi/M). The invention reduces noise and provides...
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5818303 |
Fractional N-frequency synthesizer and spurious signal cancel circuit
A fractional N-frequency synthesizer includes an accumulator outputting an output value, and a spurious signal cancel circuit. The spurious signal cancel circuit includes a pulse forming circuit,...
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5818304 |
Phase-locked loop
A phase-locked loop (PLL) includes a voltage controlled oscillator (VCO), a charge pump, a phase detector and a frequency detector. The phase detector detects the phase difference between an...
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5815540 |
Semiconductor integrated circuit device including PLL circuit
A semiconductor integrated circuit device including input and output registers, a data-processing circuit block disposed between the registers, a first PLL circuit for supplying a first output...
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5809097 |
Low jitter phase detector for phase locked loops
A digital phase detector which generates low jitter when the phase-locked-loop is in lock. A delay line, combined with an UP/DOWN phase detector causes substantial overlap in the UP and DOWN...
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5805024 |
Phase lock loop system including a primary phase lock loop apparatus and a high order phase lock loop apparatus
A phase lock loop system includes: a phase detecting circuit which operates on the basis of a signal waveform; a current output circuit for generating a current value from a phase difference...
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5805002 |
Slow transition time phase frequency detector and method
A phase frequency detection circuit and method in a phase lock loop circuit uses delay circuits to limit the period of expression of up and down signals which adjust the output frequency of a...
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5796311 |
Phase-locked loop circuit
A PLL circuit has a feedback loop including a plurality of feedback circuits in parallel and a combining circuit. The feedback circuits receives an output signal of the PLL circuit and produce...
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5789985 |
Frequency multiplying device and digitally-controlled oscillator
A frequency multiplying device which multiplies the frequency of an externally-supplied reference signal PREF includes a digitally-controlled oscillation circuit, which includes a ring oscillator...
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5789988 |
Clock recovery circuit for QAM demodulator
In a clock recovery circuit in a demodulator of a multi-level quadrature amplitude modulation (QAM) system, an analog/digital (A/D) converter performs an A/D conversion upon a coherent-detected...
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5786732 |
Phase locked loop circuitry including a multiple frequency output voltage controlled oscillator circuit
A phase locked loop including a comparator, a VCO controller, and a VCO having a multi-stage oscillator portion and a combinational logic portion. The comparator is responsive to an input clock and...
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5783972 |
Power saving PLL circuit
A phase lock loop includes a voltage controlled oscillator (VCO), a phase comparator for comparing the phases of the output of the VCO and a reference signal, a charge pump circuit, including a...
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5784122 |
Chroma lock detector
A chroma lock detector circuit monitors charge pump control signals within a phase-lock loop to determine when two input signals to the phase-lock loop are locked together in phase and generates an...
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5774511 |
Processor clock circuit
Within a microprocessor, multiple synchronous clock signals of arbitrary integer and non-integer ratios are produced with conventional digital divider circuitry. The various integer and non-integer...
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5774022 |
Digital clock recovery loop
A communications system including a clock recovery circuit that extracts a clock signal from incoming digital data, the clock recovery circuit including a voltage controlled oscillator having a...
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5770976 |
Local clock duty cycle independent phase detector and method of operation thereof
A phase detector for a phase-locked loop ("PLL") circuit under control of a local oscillating clock ("LOSC") signal and a method of operation thereof. The phase detector includes: (1) a first...
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5767713 |
Phase locked loop having integration gain reduction
A non-linear integrated phase locked loop circuit includes a phase detector for receiving a data signal and a clock pulse and for outputting a pump-up signal and a pump-down signal, a pulse divider...
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5764111 |
Voltage controlled ring oscillator frequency multiplier
A voltage controlled ring oscillator (10) integrated with a phase locked loop (101) using CMOS technology. The ring oscillator (10) provides a frequency multiplied harmonic output frequency (42) at...
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5764712 |
Phase locked loop circuit having automatic range setting logic
A method for setting a locking frequency operating range of the phase locked loop (PLL) circuit and a phase locked loop (PLL) circuit are provided with range select logic for detecting an unknown...
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5760653 |
Phase-locked loop for clock recovery
A PLL circuit includes a sampling pulse generator and a loop circuit using a sample and hold circuit as a phase detector. The sampling pulse generator generates a sampling pulse signal at each...
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5761255 |
Edge-synchronized clock recovery unit
A clock recovery unit for recovering a clock embedded in a data communication is disclosed. The clock recovery unit includes an oscillator (50) operating at a frequency close to that of the clock...
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5754080 |
Single-edge triggered phase detector
A single-edge triggered phase detector which provides high speed phase detection. The phase detector works on only a single edge of the clock and data signal, which can be either the rising or...
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