245results about "Pulse descrimination" patented technology

A method and apparatus for design-for-low-power of register transfer level (RTL) controller/data path circuits that implement control-flow intensive specifications. The method of the invention focuses on multiplexer networks and registers which dominate the total circuit power consumption and reduces generation and propagation of glitches in both the control and data path parts of the circuit. Further the method reduces glitching power consumption by minimizing propagation of glitches in the RTL circuit through restructuring multiplexer networks (to enhance data correlations and eliminate glitchy control signals), clocking control signals, and inserting selective rising/falling delays, in order to kill the propagation of glitches from control as well as data signals. To reduce power consumption in registers, the clock inputs to registers are gated with conditions derived by an analysis of the RTL circuit, ensuring that glitches are not introduced on the clock signals.

A differential data transmitter includes a first pre-driver configured to receive a differential data signal, a delay circuit configured to receive the differential data signal in parallel with the first pre-driver, and output the differential data signal with a delay time, and a second pre-driver configured to receive an output signal from the delay circuit. The delay circuit is capable of changing the delay time in accordance with a control signal. An output driver is configured to receive first and second output signals from the first and second pre-drivers, and output a pre-emphasis waveform signal that corresponds to a subtraction signal between the first and second output signals.

A fail-safe circuit for a differential receiver can tolerate noise. A latch is enabled when both differential inputs V+, V- rise above a reference voltage that is close to Vcc. The latch, once enabled, is set by an offset amplifier, signaling the fail-safe condition. The offset amplifier sets the latch when V+ is above or equal to V-. The differential amplifier has a small offset voltage to allow the latch to remain set when V+ and V- are equal in voltage. An output from a differential amplifier receiving V+ and V- can be blocked by a gate when the fail-safe condition is latched. Pullup resistors pull V+, V- to Vcc when an open failure occurs. The latch remains set when common-mode noise occurs on V+, V-, preventing noise from prematurely disabling the fail-safe condition. Such noise coupled into a broken cable is usually common-mode.

The disclosure relates to the acquisition of a binary analog signal at input of a digital integrated circuit after its range of voltage variation has been matched with that acceptable by the digital integrated circuit by means of a resistive divider bridge. It is usual to define the architecture of an ASIC digital integrated circuit on the basis of libraries of pre-characterized cells. The disclosed device is designed to increase the possibilities of choice open to the integrated circuit designer, in enabling him to one pre-characterized cell of a Schmitt trigger for its top switching threshold and another for its bottom switching threshold. It consists of a circuit comprising, at input, a bank of Schmitt triggers of different types, followed by a discrete-rendering logic circuit deducing the logic state of the binary input analog signal of the combination of the output states of the input Schmitt triggers.

A semiconductor integrated circuit device formed by a trench dielectric isolation technique has input terminals connected to positive and negative terminals of secondary cells of an assembled battery and includes monitor circuits for respectively monitoring cell voltages of the cells. Each monitor circuit includes a cell voltage detection circuit, a reference voltage generation circuit, and a comparison circuit. The cell voltage detection circuit divides a voltage between the input terminals connected to the positive and negative terminals of a corresponding cell and detects the cell voltage based on the divided voltage. The reference voltage generation circuit generates a reference voltage from the cell voltage. The comparison circuit is powered by the cell voltage of the corresponding cell and compares the divided voltage with the reference voltage.

A circuit for quickly accomplishing highly accurate phase detection using low power is described. The circuit includes a phase decision circuit that receives two clock signals and detects the phase relationship between the two signals by determining which signal was received first. In response, the phase decision circuit generates respective logic signals to reflect the phase relationship determination. The circuit also includes a latch circuit that receives the logic signals from the phase decision circuit and holds the phase relationship determination of the circuit a predetermined time after a predetermined transition of both clock signals have occurred. Methods and systems are also disclosed.

The invention discloses a method and device for eliminating signal noise, the device includes a backward-forward counter and a signal output circuit; the method for eliminating signal noise has the following steps: 1) setting valid and invalid level counting thresholds; 2) receiving the signal with signal noise needed to be eliminated by the backward-forward counter and beginning to count; when the rising edge of each clock arrives, if the signal is an valid electrical level, adding one on the current counting value, otherwise subtracting one; and the counting value does not increase/decrease until it reaches to a valid/invalid level counting threshold; meanwhile, the signal output circuit outputs signal without noise according to the counting value: when the rising edge of each clock arrives, if the counting value is a valid/invalid level counting threshold, then outputting valid/invalid level; if the counting value is between the valid and invalid level counting threshold, keeping the output equal to the output of the previous clock. The device provided by the invention can thoroughly eliminate wide noise, stably output signal without noise, and which is simple to be realized, thereby improving reliability of the system.

A reference voltage generation circuit generates a reference voltage and outputs it to an amplifier reference voltage line. A power-supply-noise adding circuit adds power supply noise superimposed on a power supply to the reference voltage generated by the reference voltage generation circuit. A differential amplifier amplifies a difference between a voltage of a vertical signal line and a voltage of an amplifier reference voltage line and outputs the amplified voltage.

The invention discloses an edge detection method and system and a clock and data recovery circuit based on an FPGA (Field Programmable Gate Array), and relates to the technical field of communication. The method comprises the following steps: performing over-sampling and delay processing on a received data signal by a local reference clock, and generating a rising edge pulse signal and a falling edge pulse signal based on the data signal being subjected to the over-sampling and delay processing, wherein the rising edge pulse signal comprises a plurality of rising edge pulses, and the falling edge pulse signal comprises a plurality of falling edge pulses; performing statistics to obtain the quantity N of local reference clock periods after the rising edge pulses and the quantity M of the local reference clock periods after the falling edge pulses respectively; and judging that the rising edge pulses are valid rising edge pulses when (M-N) is greater than a set threshold, and judging that the falling edge pulses are valid falling edge pulses when (N-M) is greater than the threshold. Through adoption of the edge detection method and system and the clock and data recovery circuit, the valid rising edge pulses and the valid falling edge pulses can be detected, and the accuracy and reliability of data signal sampling are improved.

A clock splitter circuit for providing a Single Event Upset (SEU) tolerant clock signals to latches in a space-based environment. The splitter circuit includes an event offset delay. The event offset delay receives an undelayed clock signal and generates an undelayed inverted clock, a delayed clock signal and an inverted delayed clock signal. The delayed clock signal and the inverted delayed clock signal are delayed by the known duration of Single Event Effects (SEE) on logic. The delayed and undelayed clock signals are passed to a pair of event blocking filters which block any disturbance in the undelayed and/or undelayed clock signals. The event blocking filters each generate a pair of in-phase inverted output signals. The event blocking filters are designed such that both pairs of outputs may not be low simultaneously. The in-phase output signals from each event blocking filter drive an inverting clock driver to provide a pair of SEU tolerant non-overlapping clock driver phase output signals to one or more latches.

A semiconductor device includes a current supply section configured to control a current flowing through a load circuit; an overcurrent detecting section configured to detect based on the current, that an overcurrent flows through the load circuit, to output an overcurrent signal; and an overheat detecting circuit configured to detect that a peripheral temperature exceeds a detected temperature; in response to the overcurrent signal, and output an overheat detection signal. The overheat detecting circuit has a hysteresis to the detection temperature, and the detection temperature contains an overheat detection temperature used to detect an overheat state and a recovery temperature used to detect to have escaped from the overheat state. The semiconductor device further includes a drive control circuit configured to output the current control signal which indicates the quantity of the current flowing through the load circuit based on the overcurrent signal and the overheat detection signal in the electric current supply section.

A digital pulse filtering circuit for filtering out pulses of specific pulse widths in a composite signal is provided. The digital pulse filtering circuit includes a sampling circuit for sampling the input composite signal based on a periodic clock signal to thereby generate a plurality of sampled signals of the input composite signal. In response to these sampled signals, a detection circuit outputs a low-frequency composite signal which is a filtered version of the input composite signal. The digital pulse filtering circuit is completely based on digital circuitry which can be built in integrated circuits. The cutoff frequency of the digital pulse filtering circuit is dependent on the frequency of the clock signal, which is very easy and accurate to adjust.

An oscillator includes a comparator and a variable voltage element. The comparator has a first input set to a reference voltage, a second input, and an output configured to produce an output voltage as a function of the voltages at the first and second inputs. The variable voltage element delivers to the second input a second voltage that is a function of a switched current. The switched current is a function of the reference voltage.

A clock splitter circuit for providing a single event upset (SEU) tolerant clock signal to latches in a space-based environment. The clock splitter circuit can include one or more event offset circuit delay circuits. The event offset delay receives a clock signal and generates a delayed clock signal. The event offset delay circuit can generate an inverted clock signal, a delayed inverted clock signal and a pair of intermediate clock signals. The delayed clock signal and inverted delayed clock signal can be delayed by the known duration of single event effects (SEE). The delayed and undelayed clock signals can be passed to an event blocking filter which can block any disturbance in the delayed and/or undelayed clock signals. A synchronizer can synchronize outputs of the event blocking filter prior to or coincident with being passed to corresponding inverting clock drivers. The synchronizers can also insure that the synchronized blocking filter outputs can not be low simultaneously. Intermediate clocks can also be provided corresponding to the inverting clock drivers. Outputs of the inverting clock driver can be a pair of SEU tolerant non-overlapping clock phase signals for driving one or more latches.

The invention belongs to the technical field of on-chip clocks of very large scale integrated circuits, and particularly relates to a skew detection and skew elimination regulation circuit for an on-chip clock system of a VLSI (very large scale integrated circuit). The circuit is composed of an early phase detection module, an offset detection module, a transcoding circuit, a configurable delay circuit and two alternative data selectors, wherein the early phase detection module is used for detecting the sequence of the phases of two clocks; output signals are sent to the two data selectors; the actual offset is detected by the two clocks through the offset detection module; the configurable delay circuit is controlled via the transcoding of the transcoding circuit; and the clock with the earlier phase is relayed by phases equivalent to the offset so as to ensure that an edge-aligned and phase removing two-phase clock is outputted. The circuit realizes a semi-custom design circuit based on a standard cell library, has the advantages of simple logic, controllable precision, excellent flexibility and the like, and is compatible with the current universal digital integrated circuit design flow inputted on basis of the hardware description language (HDL).

A noise suppression circuit for suppressing noises above and below reference voltages is disclosed. The noise suppression circuit for suppressing noises includes a means for generating a power-on-reset signal, a clamping transistor, and a feedback circuit. The means for generating a power-on-reset signal presets an internal latch of the noise suppression circuit to a predetermined state, such as a logical high state. The clamping transistor restores the state of a data input of a circuit to which the noise suppression circuit is providing protection, after the occurrence of a noise coupling event. The feedback circuit then turns off the clamping transistor after a predetermined amount of time.

In a chattering eliminating apparatus, a coincidence circuit receives an input signal of the apparatus and an output signal of the apparatus to determine whether or not a level of the input signal of the apparatus is the same as a level of the output signal of the apparatus. An oscillation circuit carries out an oscillation operation only when the level of the input signal of the apparatus is not the same as the level of the output signal of the apparatus. A counter counts an output signal of the oscillation circuit, and is reset when the level of the input signal of the apparatus is the same as the level of the output signal of the apparatus. An output signal generating circuit inverts the level of the output signal of the apparatus when a counter value of the counter reaches a predetermined value.

A clock signal generating apparatus including a clock generator, a distributor, a plurality of delay units, and generates a clock signal for synchronized driving of a system having a plurality of clock receiving apparatuses. The clock signal generator generates a clock signal for driving the system by using an external clock signal and a feedback clock signal. The distributor distributes the clock signal output to generate a plurality of distributed clock signals and outputs the plurality of distributed clock signals to the plurality of clock receiving apparatuses through a plurality of signal transmission paths. The plurality of delay units are respectively located on the plurality of signal transmission paths, control phases of the plurality of distributed clock signals to generate a plurality of phase-controlled clock signals, and transmit the plurality of phase-controlled clock signals to the plurality of clock receiving apparatuses.

The demodulation circuit of the present invention is a demodulation circuit, connected with a plurality of light-receiving sections each for receiving an optical signal and converting the signal into a binary pulse signal, operable to select and demodulate a pulse signal out of pulse signals that are supplied from the light-receiving sections, respectively, the demodulation circuit including: a judgment and selection section for detecting timing with which High level and Low level of each of the pulse signals are switched and for selecting at least one pulse signal based on the timing; and a demodulation section for demodulating the pulse signal selected by the judgment and selection section. Consequently, the demodulation circuit easily selects and demodulates a signal whose jitter component is small out of a plurality of supplied signals.

The invention relates to a slow rising edge pulse signal identification circuit. The slow rising edge pulse signal identification circuit includes a differential unit, a zero crossing comparison unit and a pulse width identification unit; the differential unit performs differential processing on unipolar photon pulse signals inputted from the outside, so that bipolar signals with two zero crossing points can be formed and transmitted to the zero crossing comparison unit; the zero crossing comparison unit converts the bipolar signals into digital pulse signals with a certain pulse width according to a set comparison threshold value, and transmits the digital pulse signals to the pulse width identification unit; and the pulse width identification unit judges whether the width of the digital pulse signals exceeds a set identification threshold value, and judges that the photon pulse signals inputted from the outside are slow rising edge signals and outputs a high-electric level pulse if the width of the digital pulse signals exceeds the set identification threshold value, otherwise, outputs a low-electric level pulse. The slow rising edge pulse signal identification circuit of the invention has the advantages of simple circuit form and high sensitivity.

The invention discloses a testing method for pulse modulated signals, which comprises the following steps: (1) converting a pulse-modulated signal to a sampled digital signal through an AD sampling unit; (2) converting the sampled digital signal to a pulse baseband signal by a digital frequency converter; and (3) processing the pulse baseband signal in two paths, wherein the first path is used for forming a triggering pulse for controlling and selecting data segments, the second path is stored in a buffer through a data storage/selection control unit; (4) generating a profile envelope of the whole pulse-modulated signal by an envelope demodulating unit; (5) generating a pulse triggering signal from the profile envelope by a pulse envelope shaping unit; (6) generating a triggering data gating signal from the pulse triggering signal by a triggering parameter setting unit; and (7) outputting a corresponding pulse baseband signal to a pulse parameter analyzing unit by a the data storage/selection control unit under control by a gating signal; and performing pulse baseband signal calculation and analysis by the pulse parameter analyzing unit.

The invention relates to a method and a device of screening digital pulse signal. The method mainly comprises a step of respectively setting a threshold value of each criterion parameter of the digital pulse signal. The method comprises a step of using a parallel stream line working way to capture a plurality of the criterion parameters of the digital pulse signal in real time, a step of judging whether each criterion parameter conforms to the set threshold value, and a step of judging the digital pulse signal as an effective digital pulse signal when each criterion parameter of the plurality of the criterion parameter conforms to the set threshold value. Because of adoption of the real-time dealing method of the multi-criterion parallel stream line, real-time performance can be improved, the digital pulse signal can be regarded as the criterion parameter to conduct grain screening only if wave forms of the digital pulse signal are different, and therefore, pulses with different wave forms can be distinguished to the utmost.

In one embodiment, a method for a control interface includes: receiving a signal conveying bits of information over a single line; and for each bit of information, comparing the proportion of time that the signal on the single line is low versus the proportion of time that the signal on the single line is high for a respective bit period defined from one operative edge of the signal to the next operative edge of the signal in order to determine a logic value for that bit of information.