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7567100 Input clock detection circuit for powering down a PLL-based system  
An apparatus is provided for detecting the loss of an input clock signal for a phase-locked loop (PLL). The apparatus includes a time delay circuit, a first frequency divider and a digital logic...
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...
7498848 System and method for monitoring clock signal in an integrated circuit  
A clock monitor system for monitoring an input clock signal in an integrated circuit (IC) includes a clock failure detection circuit and a delay circuit. The clock failure detection circuit...
7447511 Method and device for equalizing mode selection  
A method and a device for equalizing mode selection are disclosed. The method comprises steps of: providing first sampling pulses in response to an equalized signal; providing second sampling...
7414438 Clock based voltage deviation detector  
The clock based voltage deviation detector of the present invention includes a pulse module, an indicator module and a correlation module. The pulse module generates a stream of reset pulses as a...
7358776 Signal detection circuit and signal detection method  
It is intended to provide a signal detection circuit and a signal detection method capable of preventing influences of variations in transistor characteristics, occurrence of yield degradations of...
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...
7296170 Clock controller with clock source fail-safe logic  
A microcontroller integrated circuit with a clock controller and a processor automatically switches the source of the clock signal that clocks the processor from a failed fast external precision...
7257323 Signal-off detection circuit and optical receiving device using the same  
This invention offers a signal-off detection circuit allowing arbitrary setting of an issuing time (response time) of a signal disconnection alarm without being affected by a time constant of a...
7254662 Data link layer device for a serial communication bus  
According to the IEEE1394 bus protocol, priority is given to isochronous data packets. Data transfer is done in transfer cycles under the control of a cycle master. It depends on the allocated...
7176726 Integrated loss of signal detection with wide threshold range and precise hysteresis  
A loss-of-signal (LOS) detector includes a variable gain amplifier with an input receiving an input signal, a threshold comparator with a first input receiving a signal derived from an output of...
7113003 Presence indication signal associated with an attachment  
According to some embodiments, a presence indication associated with an attachment is provided.
7095256 Low-power wide dynamic range envelope detector system and method  
An envelope detector system is disclosed for detecting an envelope in a system input signal. The envelope detector system includes an input node for receiving an input voltage signal, a...
7068079 Circuit device with clock pulse detection facility  
The invention refers to a circuit device ( 1 ) with at least one connection ( 3 b ), to which a clock pulse (/CLK, /CLK T ) can be applied, whereby the circuit device ( 1 ) also comprises a clock...
7046704 Tunable laser with a fixed and stable wavelength grid especially useful for WDM in fiber optic communication systems  
A wavelength tunable mode-locked laser system including a complex laser cavity comprising a broadband reflective mirror at one end and a wavelength chirped selective mirror at the other end. The...
7038508 Methods and apparatuses for detecting clock loss in a phase-locked loop  
Embodiments of the present invention describe methods and apparatuses for detecting signal loss in circuits such as a phase-locked loop (PLL). In one embodiment a PLL is equipped with detection...
7034562 Oscillation detecting apparatus and test apparatus  
An oscillation detecting apparatus for detecting oscillation of a signal includes a high pass filter for generating an alternating current signal from which a direct current component of the signal...
7002377 Clock signal detection circuit and semiconductor integrated circuit using the same  
A clock signal detection circuit is provided that can reliably detect whether or not a clock signal is supplied with a reduced circuit scale and reduced power consumption. The clock signal...
6943590 Clock monitoring apparatus  
A clock monitoring apparatus according to the invention including a main clock monitoring portion including a first counter for counting a main clock, issuing a normal operation confirming flag...
6943591 Apparatus and method for detecting a fault condition in a common-mode signal  
The invention is directed to an apparatus and a method for generating a fault detection signal when a differential signal is in a fault condition. The fault condition arises when the data...
6873190 Apparatus for sensing the presence of an inductive load driven by a pulse width modulated signal  
A circuit for sensing the presence of an inductive load that is particularly applicable to sensing when a solenoid is being driven by a pulse width modulation (PWM) signal. The circuit includes a...
6785354 Lock detection system for use in high speed communication systems  
A lock detection method for generating a lock signal including providing a data signal and a clock signal to a clock detection unit, the data signal being describable by an eye pattern, the data...
6782485 Microcomputer operable with external and internal clock signals  
A microcomputer is provided, which eliminates the need of input of a selection signal to select whether an external oscillator element is connected to generate an internal clock signal or an...
6782336 Test outputs using an idle bus  
A test circuit receives a plurality of internal test signals and delivers a group of the plurality of internal test signals onto a bus during an idle state of the bus. The bus is coupled to output...
6737892 Method and apparatus for detecting valid clock signals at a clock receiver circuit  
One embodiment of the present invention provides a system for detecting a valid clock signal at a clock receiver. The system operates by receiving a clock signal at the clock receiver, and...
6707320 Clock detect indicator  
A clock detect indicator capable of determining the presence of high and low frequency clock signals is provided. The clock detect indicator, which operates independent of a reference clock, has...
6701398 Global bus synchronous transaction acknowledge with nonresponse detection  
An integrated multi-processor system with clusters of processors on a high speed split transaction bus uses a transaction acknowledge (TACK), by a target device in response to receiving a request...
6662154 Method and system for information signal coding using combinatorial and huffman codes  
The invention provides a method of coding an information signal. An information signal is represented by a sequence of pulses. A plurality of pulse parameters are determined based on the sequence...
6640328 Method for detecting dropouts in data delivered over a bandwidth-limited bus  
A method for detecting dropouts in digital data transferred over a bus from a digital data source to a computer system. Each address in the computer system buffer memory is initialized to a...
6597204 Clock interruption detection circuit  
A clock interruption detection circuit comprises a frequency divider circuit for outputting a plurality of frequency divided clocks by dividing an input clock with different division values, an AND...
6553496 Integration of security modules on an integrated circuit  
An integrated circuit includes secure logic that requires protection. Secure assurance logic protects the secure logic. The secure assurance logic includes a plurality of protection modules that...
6496549 Method and apparatus for demodulating amplitude-shift keyed data signals  
An approved demodulator is disclosed for demodulating optical ASK data signals whose data bits are each characterized by either an absence of pulses or a burst of pulses at a predetermined...
6469545 Circuit configuration for detecting the state of at least one electrical actuating element  
A circuit for detecting a state of at least one electrical actuating element is described. The circuit has a signal input for receiving an input signal representing the state of the actuating...
6393596 Missing pulse detector using synchronous detection  
A data decoder for decoding digital data in a high frequency signal in an optical storage device. A carrier signal derived from the high frequency passed through a zonal bandpass filter and a...
6246276 Clock signal cleaning circuit  
A device which reduces jitter and narrows the frequency spectrum of a jitter-ridden clock signal includes a basic unit having a plurality of series connected delay elements outputs from each delay...
6215334 Analog signal processing circuit with noise immunity and reduced delay  
An improved pulse detection circuit provides for a reduced delay response and noise immunity. The pulse detection circuit includes a comparator with a biasing circuit providing first and second...
6198310 Circuit arrangement for monitoring a clock-timed load  
A circuit arrangement for monitoring a load operated with a clock signal is provided. The circuit arrangement may be applied to the field of automotive engineering. The circuit arrangement includes...
6163172 Clock loss detector  
A system and method for providing a static mode for logic circuits with dynamic latches. The invention provides a reliable static mode for testing of the logic circuit, prevents "through current"...
6147528 Method of invoking a power-down mode on an integrated circuit by monitoring a normally changing input signal  
An integrated circuit comprises means responsive to a normally changing signal at an input of the integrated circuit to implement a primary function of the circuit, and means for monitoring this...
6137331 Electronic circuit with dual edge triggered flip-flop  
The electronic circuit contains dual edge triggered flip-flop, which loads data on both the rising edge and the falling edge of a clock signal. The clock signal is supplied by a clock supply...
6087858 Self-timed sense amplifier evaluation scheme  
A circuit and method for generating an evaluation signal used to turn OFF one or more sense amplifiers. The sense amplifiers may be configured to present a first and second output in response to...
6081559 Apparatus for detecting the presence or the absence of a digitally modulated carrier, a corresponding receiver, and a corresponding method  
The invention relates to apparatus for detecting the presence or the absence of a signal carrier wave received by a receiver. The carrier wave is modulated by a digital signal at a symbol clock...
6054878 Address transition detection summation circuit  
An address transition detection summation circuit is provided that selectively maintains an input voltage of a pull-up circuit at an intermediate level during a pull-up time. The address transition...
6008672 Input signal reading circuit having a small delay and a high fidelity  
An input signal reading circuit includes an up-down counter receiving an input signal and a sampling clock to count up the samplig clock when the input signal is at a high level and to count down...
6002274 Oversampled state machine for jitter tolerant pulse detection  
A transmission line sampling circuit for a T1 line is disclosed. A multi phase oscillator is connected to a plurality of state machines which are connected in parallel to a transmission line. The...
5942924 Digital circuit for conserving static current in an electronic device  
This invention relates to a digital circuit for controlling the power usage of an electronic device such as a read only memory (ROM) for a computer device, particularly a portable computer device...
5936431 Input signal variation detection circuit  
An input signal variation detection circuit effectively detects transitions of input signals from a memory apparatus. The circuit includes a plurality of unit blocks for detecting transitions of...
5923191 Device and a method for monitoring a system clock signal  
A system clock signal monitor that monitors a system clock signal by comparing a pulse width of a logic high pulse and a pulse width of a logic low pulse of each system clock duty cycle of the...
5918202 Electric interpolating apparatus and position information detecting apparatus using such apparatus  
An interpolating process is performed on an input periodic signal using at least one first circuit board and a second board. Each first circuit board includes a partial circuit for performing the...
5917359 Semiconductor apparatus having protective circuitry  
The drain electrodes of HNMOS transistors (2) and (3) are connected to the first ends of resistors (4) and (5), and to the inputs of inverter circuits (6) and (7) respectively. The outputs of the...
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