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8169236 Frequency detection mechanism for a clock generation circuit  
A frequency detection mechanism for a clock generation unit on an integrated circuit includes a clock generation unit and a detection unit. The clock generation unit may generate an output clock...
8154321 Method and apparatus for time-differential comparison of an analog signal  
A time-differential analog comparator is disclosed. An example apparatus according to aspects of the present invention includes a source of a variable frequency signal having a frequency responsive...
8125250 Frequency detection mechanism for a clock generation circuit  
A frequency detection mechanism for a clock generation unit on an integrated circuit includes a clock generation unit and a detection unit. The clock generation unit may generate an output clock...
8095102 Phase-lock loop  
In one implementation an output signal of an oscillator is varied to be within a desired frequency band with respect to a reference signal, the output signal having a plurality of phases. The...
8076979 Lock detection circuit for phase locked loop  
A lock detector circuit for detecting a lock condition between a reference signal and a feedback signal includes a first counter for outputting a first counter value indicative of a number of clock...
7956665 Methods and articles of manufacture for operating electronic devices on a plurality of clock signals  
Embodiments of the invention relate to an integrated circuit comprising at least one functional unit configured to operate at a first clock frequency. The integrated circuit also comprises at least...
7873139 Signal processing device  
A signal processing device includes a detecting part that detects intensity of an input signal, a timer part that includes a time constant circuit and measures time based on a time constant of the...
7821302 Frequency monitor  
A method and system for monitoring a frequency of a clock signal is disclosed. The method and system comprise dividing a clock signal into a plurality of clock signal components. The method and...
7750685 Frequency measurement based frequency locked loop synthesizer  
A first embodiment of the present invention relates to a frequency and phase locked loop (FPLL) synthesizer having a frequency-locked loop (FLL) operating mode and a phase-locked loop (PLL)...
7567099 Filterless digital frequency locked loop  
A frequency and/or phase locked loop architecture that eliminates the loop filter generally required in conventional phase locked loops, and which may be implemented in digital logic, for example,...
7532040 Programmable sensitivity frequency coincidence detection circuit and method  
A frequency coincidence detection circuit for detecting frequency edges for each of a plurality of periodic digital signals. The circuit generates count indicators for each of the periodic digital...
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...
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...
7454645 Circuit and method for monitoring the status of a clock signal  
A circuit and method are provided herein for monitoring the status of a clock signal. In general, the method may include supplying a pair of clock signals to a clock monitor circuit, which is...
7352214 System and method for clock detection with glitch rejection  
A system and a method are presented for detecting the presence of at least one clock signal of a defined clock frequency applied to at least one input port of an integrated circuit system, wherein...
7343512 Controlling clock rates of an integrated circuit including generating a clock rate control parameter from integrated circuit configuration  
Systems and methods for controlling clock rates of circuits are provided. The systems and methods, collectively referred to as clock rate control, generate a clock rate control parameter from data...
7343510 Method and device for selecting one of multiple clock signals based on frequency differences of such clock signals  
A clock detection and selection circuit (100) can include a first counter (102-0) that generates a first count value CNT1 according to a first clock signal CLK1 and a second counter (102-1) that...
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...
7242223 Clock frequency monitor  
A frequency monitor circuit (FMC) that is part of an integrated circuit chip for monitoring the frequency of one or more clocks present on the chip is disclosed. The FMC includes a reference window...
7224751 Device and method for checking whether a signal with a predetermined frequency is being received  
A device and method are disclosed, whereby the normally complicated and difficult frequency determination is achieved by simply arranged and executed measures, namely by means of larger, smaller...
7154305 Periodic electrical signal frequency monitoring systems and methods  
Systems and methods for monitoring frequencies of periodic electrical signals are disclosed. According to one technique, a first and second counters are respectively clocked by a first periodic...
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...
7095353 Frequency to digital conversion  
A technique of processing an input signal having an input signal phase is disclosed. The technique includes determining a number of transitions of the input signal within a period having a start...
7095254 Method for producing a control signal which indicates a frequency error  
A method which provides a very simple way of forming a control signal if the frequencies differ too greatly from one another between a useful signal and a reference signal. A control signal is...
7046964 Method and apparatus for determining the frequency of a radio signal during periods of stability and monitoring communications with a radio receiver  
A method and apparatus provide for monitoring radio frequency signals and, in conjunction with the monitoring, determining frequency of a received dominant radio frequency signal. Zero amplitude...
6891402 Clock's out-of-synchronism state detection circuit and optical receiving device using the same  
A detection circuit which can reliably detect an out-of-synchronism state of a clock signal with respect to data even if jitter is present in a data signal. A delayed clock signal obtained by...
6891404 Auto-adjustment of self-refresh frequency  
A method of adjusting a control signal that includes generating a control signal at an unknown frequency and automatically adjusting the unknown frequency of the control signal based on the unknown...
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...
6807225 Circuit and method for self trimming frequency acquisition  
A circuit and method is disclosed for self trimming in frequency acquisition and clock recovery. The circuit can be simplified as having a VCO in communication with three loops including a trimming...
6788044 Frequency change measuring device  
A frequency change measuring device includes frequency divider for frequency dividing a measuring signal to produce frequency-divided signals, first counter for counting the frequency-divides...
6771063 Methods and systems for improving the duty cycle output of a vehicle speed sensor circuit  
A system for improving the duty cycle output of a vehicle speed sensor circuit is disclosed. The vehicle speed sensor circuit can be configured, for example as a binary counter, to provide a...
6661266 All digital built-in self-test circuit for phase-locked loops  
In general, a built-in self test circuit and method is provided that measures error in any periodic signal and, particularly, a Phase Lock Loop (PLL) output clock signal. The circuit includes a...
6597205 High accuracy method for determining the frequency of a pulse input signal over a wide frequency range  
A method and system for determining the frequency of a pulse input signal is disclosed. A pulse count and a timer count can be captured at a start and end of a predetermined measurement interval to...
6563346 Phase independent frequency comparator  
A method and circuit for comparing the frequencies of two clocks (clock—1 and clock—2), without taking into account their phase, is disclosed. Each clock is associated to a circular counter (10...
6501310 Sampling clock adjusting method, and an interface circuit for displaying digital image  
The PLL (Phase Lock Loop) circuit generates a sampling clock for sampling an analog image signal and a second clock having a frequency equal to that of the sampling clock and a phase different from...
6362693 Frequency detection method for adjusting a clock signal frequency and a frequency detector circuit for carrying out the method  
In a frequency detection method for adjusting a clock signal frequency to the data rate of a received data signal, the clock signal which is predivided by a factor of 4. The predivided clock signal...
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...
6326826 Wide frequency-range delay-locked loop circuit  
A delay-locked loop (DLL), including frequency detection logic and a phase detector, is described having an operating range as wide as a conventional charge pump phase locked loop. The frequency...
6288574 Digital phase detector  
A digital phase detector utilizes a digital compartor and a plurality of delay elements. The comparator compares two signals and generates an output signal with a duration corresponding to the time...
6246261 Circuit for detecting the disappearing of a periodic signal  
A circuit for detecting the disappearing of a periodic input signal, the circuit including a frequency divider receiving the input signal, the frequency divider having two complementary outputs...
6229369 Clock control circuit  
In a clock control circuit there are provided a counter for dividing a reference clock signal so as to generate a plurality of divided clock signals and selectors for selectively outputting one of...
6148055 Counter and a revolution stop detection apparatus using the counter  
6008671 Clock signal monitoring apparatus  
An apparatus for monitoring a reference clock signal having a clock pulse train comprises a detecting block for counting pluses of a count clock signal to produce a count value and generate a count...
6005381 Electrical signal phase detector  
A circuit for detecting a predefined reoccurring phase point an periodic electrical signal has an input stage which rectifies the signal into first and second complementary signals. A Schmitt...
5949841 Frequency gain display apparatus for L/C band frequency up unit  
A frequency gain display apparatus for an L/C band frequency up unit which is capable of generating a pulse for adjusting the gain of an L/C band frequency up unit used in a satellite system and a...
5929670 Method for improving signal generator frequency precision using counters  
A method for improving the precision of a signal generator utilizing counters. The difference between an external standard signal frequency and an internal standard frequency is measured by digital...
5930294 Frequency measurement circuit  
A counter circuit and a frame control circuit receive a reference clock signal and one or more external clock signals. The counter circuit in combination with the frame control circuit measures the...
5896049 Electrical signal frequency detector  
A circuit for measuring the frequency of an electrical signal includes a detector that senses a reoccurring phase point the electrical signal. A divide-by-M counter is connected to the detector and...
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...
5874839 Timer apparatus  
In a timer apparatus, the clock controlling circuit thereof outputs a clock signal during a period in which an input signal is significant. The counter thereof counts the number of pulses of the...
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