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8040156 Lock detection circuit and lock detecting method  
Provided are a lock detection circuit and a lock detecting method. The lock detection circuit includes two delay devices, four flip-flops and two logic gates, and can accurately detect a lock state...
7956649 Frequency pattern detector  
A window sampling system and method are provided for comparing a signal with an unknown frequency to a reference clock. A pattern modulator accepts a compClk signal and supplies a test window with...
7932751 Frequency mode selection discriminator and low pass filter  
A circuit is described that detects high and low frequencies and additional clock frequencies and outputs a signal that indicates a high, a low frequency or an additional mode. When in the low...
7786763 Clock circuit with harmonic frequency detector  
A clock circuit includes a phase-lock loop for generating an output clock signal based on a data signal and a harmonic frequency detector for detecting whether the frequency of the output clock...
7764088 Frequency detection circuit and detection method for clock data recovery circuit  
A frequency detection circuit and a detection method thereof suitable for a clock data recovery (CDR) circuit are provided. The frequency detection circuit includes a phase detector, a first...
7719331 PLL circuit  
Disclosed is a PLL circuit including a phase frequency detector (PFD) for comparing phase and frequency between an input signal and an output signal, a charge pump circuit for charging a capacitor...
7710161 Digital low frequency detector  
A digital circuit is disclosed for detecting clock activity in an integrated circuit (IC) device. In one implementation, a clock detection circuit can include two flip flops. A first flip flop...
7696789 High-frequency signal detector  
Disclosed is a high-frequency signal detector circuit including a diode detector circuit for detecting an input signal by diode detection; a differential-input/differential output amplifier with a...
7692501 Phase/frequency detector and charge pump architecture for referenceless clock and data recovery (CDR) applications  
A stream of data may flow over a fiber or other medium without any accompanying clock signal. The receiving device may then be required to process this data synchronously. Embodiments describe...
7558357 Systems and methods for reducing frequency-offset induced jitter  
Methods and apparatus nullify an intrinsic jitter component in a digital clock recovery circuit induced by a time base frequency difference between an incoming data signal and a local...
7504865 Frequency sensor and semiconductor device  
A frequency sensor includes at least one a resistor element and a capacitor. A frequency is detected according to a charging/discharging time to/from the capacitor, thereby realizing a frequency...
7471117 Circuit for detecting maximal frequency of pulse frequency modulation and method thereof  
The circuit for detecting the maximal frequency of the pulse frequency modulation includes an oscillator-controlling unit, a delay circuit and a master-slave register. The oscillator-controlling...
7466789 Counter with correction circuitry  
The invention concerns counting circuitry for providing a corrected count value based on the number of rising and falling edges of an input signal occurring during a reference time period, the...
7427879 Frequency detector utilizing pulse generator, and method thereof  
The present invention discloses a frequency detecting apparatus for detecting a frequency of an input clock. The frequency detecting apparatus includes: a pulse generator, a digital signal...
7375557 Phase-locked loop and method thereof and a phase-frequency detector and method thereof  
The phase-frequency detector may include a first flip-flop configured to generate a first signal, the first signal transitioning to a first logic level in response to a first edge of a first input...
7375565 Delay locked loop in semiconductor memory device  
A delayed lock loop for preventing a stuck fail in a dead-zone includes a clock buffering block for generating a first and a second internal clock signals; a phase comparison block for delaying a...
7327171 Charge pump clock for non-volatile memories  
A charge pump clock circuit for a memory device generates pump clock signals at an adaptive rate. Clock edges are generated at a minimum of TD seconds apart so long as address transitions do not...
7292070 Programmable PPM detector  
A device such as a programmable logic device (“PLD”) includes circuitry for detecting the PPM frequency difference between two input clock signals. For example, this circuitry may accept a use...
7259595 Circuit and method for detecting frequency of clock signal and latency signal generation circuit of semiconductor memory device with the circuit  
A frequency detection circuit and method of detecting the frequency of a clock signal, and a latency signal generation circuit for a semiconductor memory device that includes the frequency...
7148755 System and method to adjust voltage  
A system and method that can be utilized to implement voltage adjustment (e.g., for an integrated circuit). In one embodiment, the system comprises a frequency generator that provides a clock...
7145398 Coarse frequency detector system and method thereof  
An improved coarse frequency detector includes a first storage device responsive to a data signal and a sub-multiple of a clock signal for detecting a first transition in the data signal during a...
7038496 Device for comparison of frequencies with low temporal inertia  
The present invention relates to a device for comparison CMP, which is designed to emit a control signal Vcnt, which is representative of a difference which exists between the input signal...
7015727 Generating a lock signal indicating whether an output clock signal generated by a PLL is in lock with an input reference signal  
A PLL lock generator using one circuit (lock detection block) to indicate whether an output clock signal is locked to an input reference signal, and another circuit to determine whether the signals...
6960940 Short circuit protection apparatus with self-clocking self-clearing latch  
A latch for detecting a state transition of an input signal and generating a self-clearing reset signal on an output. The latch comprises: 1) a transfer gate for passing the input signal to a first...
6834093 Frequency comparator circuit  
A frequency comparator circuit is configured to compare whether the frequency of two input signals are within a tolerance of each other. The frequency comparator circuit includes two counter...
6831485 Phase frequency detector with a narrow control pulse  
A phase frequency detector with a narrow control pulse comprises mainly two substantially equivalent phase latches with a narrow control pulse, and a reset signal generating unit. Each phase latch...
6704382 Self-sweeping autolock PLL  
An improved phase-lock loop circuit comprising a phase detector, a loop filter, and a voltage controlled oscillator. The phase detector samples the phase-lock loop input signal at various points in...
6650146 Digital frequency comparator  
A digital frequency comparator includes two double-edge triggered flip-flops and a combination logic. Each of the double-edge triggered flip-flops includes two D-type flip-flops and two...
6466058 PLL lock detection using a cycle slip detector with clock presence detection  
A system 400 and method 1400 are disclosed for a lock detection circuit of a phase locked loop used in a communications device. The lock detection circuit includes a cycle slip detector and a clock...
6404240 Circuit and method of a three state phase frequency lock detector  
A three state phase frequency lock detector (14) is provided which monitors the UP and DOWN phase pulses generated by a three state phase frequency detector (PFD). The lock detector (14) asserts...
6331792 Circuit and method for unlimited range frequency acquisition  
An improved frequency detector circuit and method is disclosed for frequency acquisition. The frequency detector is particularly useful as part of a frequency loop in a standard two loop clock and...
6320424 Method of providing and circuit for providing phase lock loop frequency overshoot control  
A phase lock loop system is provided that includes a phase frequency detector device to receive a reference clock signal and a feedback clock signal and to provide a first control signal and a...
6259279 High frequency detection circuit and method  
The present invention is a high frequency detection circuit (10) which includes a high frequency filter (12) and a frequency comparator (14) which compares the output of the high frequency filter...
6252428 Method and apparatus for detecting a sinusoidal signal  
A method and apparatus for detecting a sinusoidal signal samples a received signal. An error signal generator receives at its inputs two previous samples of the signal and a current sample of the...
6177813 Low frequency detection circuit  
An improved low frequency detection circuit is disclosed. The low frequency detection circuit employs as an internal clock signal of the system the negative delay signal CK1 generated in accordance...
6114880 Dynamic over frequency detection and protection circuitry  
An over frequency detection circuit which is based on the concept of a critical path in a design to protect an IC chip from running at a rate which will produce unpredictable results. The over...
6084442 Digital oscillator for generating two fixed pulse signals from one clock  
In order to use a digital oscillator to generate a target frequency ZT with a "high" or "low" level constant in time from a working clock by variable division by a first division factor, two...
6081137 Frequency detecting circuit  
A frequency detecting circuit is provided that includes a level shift detecting unit for generating pulse signals of a certain pulse width at each level shifting of input clock signals and a level...
6075389 Operation speed measuring circuit and semiconductor device incorporating the same circuit  
An operation speed measuring circuit measures a difference in propagation delay time between first and second path 2, 3 including logic gates connected in series and thus confirms that an element...
6069498 Clock generator for CMOS circuits with dynamic registers  
An apparatus has a clock monitoring device, which determines whether or not the clock rate of an input clock signal (Φ0) has fallen below a predetermined minimum clock rate. A system is provided ...
5894232 Processor local bus frequency detection circuit  
One or more detection circuits are provided for determining the operation of a motherboard prior to placing a microprocessor upon that motherboard. The detection circuit determines a particular way...
5889418 Frequency detector of phase locked loop  
A frequency detector in a phase locked loop which generates a clock signal for reproducing a signal from a optical disc. 3 T information corresponding to an upper limit of the frequency of the...
5844446 Oscillator based tamperproof precision timing circuit  
An oscillator that has a substantially-constant voltage source configured such that it does not require the voltage source to be tuned to a particular voltage to oscillate a particular frequency....
5818206 Method and apparatus for automatically detecting device specifications and providing a corresponding operating voltage  
A power supply system for detecting an operating configuration of a device, such as a processor, and for providing a corresponding operating voltage to the device. The power supply system includes...
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...
5736873 Power saving control circuit for a display apparatus  
A power control circuit of a monitor capable of being applied to all kinds of monitors is constructed to supply a control signal in accordance with the state of the monitor among On, Stand-by,...
5631582 Frequency and phase comparator  
A frequency and phase comparator has a first flip-flop and a second flip-flop. Logical calculation between the outputs of these flip-flops is performed by an AND circuit, and the first and second...
5606276 Method and apparatus for creating a large delay in a pulse in a layout efficient manner  
A delay element (10) generates a delay pulse (OUT) the length of which is not dependent on an available system clock. The delay element uses oscillators (12a, 12b, 12c) and edge detectors (16a,...
5546025 Low frequency discrimator using upper and lower thresholds  
The present invention relates to a low frequency discriminator circuit comprised if apparatus for providing a rectangular wave input signal, apparatus for integrating the input signal, apparatus...
5440252 State machine with hysteresis for detecting frequency of an input signal  
The state machine with hysteresis provided in the invention includes a current state circuit and a next state control circuit. The current state circuit, in response to a clock signal and a control...
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