126 results about "Duty cycle distortion" patented technology

An equalizer for serial data communications can be configured to compensate for the effects of deterministic jitter. The equalizer can be configured to compensate a received serial data stream for the effects of data-dependent jitter as well as duty cycle distortion jitter. The equalizer can be configured to determine the value of one or more previously received symbols and compare them to a recovered symbol. The equalizer can adjust a variable delay positioned in the serial data path to introduce a delay into the data path that is based in part on the received data stream. The equalizer can be configured to vary the delay when any of the one or more previously received symbols is different from the recovered symbol, and can be configured to maintain a constant delay if the one or more previously received symbols is the same as the recovered symbol.

A transmission system, circuit and method are provided herein for converting differential signals into low duty cycle distortion, single-ended signals that are insensitive to variations in PVT and input common mode voltage. In one embodiment, the signal translation circuit includes an input stage for receiving a pair of differential input signals and producing one or more differential output signals; an intermediate stage for combining the one or more differential output signals into a pair of complementary signals from which a common mode voltage is detected; and an output stage for generating a single-ended output signal that switches from a first value to an opposite value when one of the complementary signals is substantially equal to the common mode voltage.

A completely differential approach to correcting duty-cycle distortions of a differential clock signal propagating through a differential amplifier. A duty-cycle distortion correction (DCDC) differential amplifier circuit/device is provided with a differential amplifier whose output wires are coupled to a correction circuit. The correction circuit comprises a differential low pass filter and a differential correction amplifier. The differential correction amplifier's output is dotted back into the output of the amplifier. The differential output of the amplifier is passed through the low pass filter, which provides differential DC output signals that triggers respective correction amplifier transistors to generate an inverted correction current that is added back to respective differential output pulse. The DCDC differential amplifier provides a completely differential approach to correction of duty-cycle distortions within the differential output.

A circuit for controlling a duty cycle of a clock signal. The circuit includes a duty cycle control loop that includes a voltage-to-duty cycle (V-to-DC) converter, an output driver, a duty-cycle-to voltage (DC-to-V) converter, and an operational amplifier. The V-to-DC converter receives an input clock signal. The output driver is coupled to the V-to-DC converter and provides an output clock signal that is associated with a duty cycle distortion value. The DC-to-V converter converts the output clock signal to an average voltage. The operational amplifier amplifies an error between the average voltage and a reference voltage. The error is fed back to the V-to-DC converter through a negative feedback loop, wherein the V-to-DC converter adjusts a duty cycle of the input clock signal based on the error.

In accordance with the teachings described herein, systems and methods are provided for automatically correcting duty cycle distortion. A slicer may be used to receive a data input signal and compare the data input signal with a slicer offset voltage to generate a sliced data signal. The slicer may also receive an offset control signal to automatically adjust the slicer offset voltage. A phase detector may be used to receive the sliced data signal and a recovered clock signal and to compare the sliced data signal with the recovered clock signal to generate a rising edge output signal and a falling edge output signal. The rising edge output signal may correspond to a phase difference between a rising edge of the sliced data signal and an edge of the recovered clock signal. The falling edge output signal may correspond to a phase difference between a falling edge of the sliced data signal and an edge of the recovered clock signal. A first feedback circuit may be used to phase-lock the recovered clock signal to the sliced data signal utilizing at least one of the rising edge output signal and the falling edge output signal. At least one of the rising edge output signal and the falling edge output signal may be configured in a second feedback circuit to generate the offset control signal.

Disclosed is a circuit comprising a differential input amplifier stage, a capacitor stage, an inverter chain stage, and a biasing circuit. The inverter chain stage may be formed with or without feedback depending on whether a clock signal or data signal is to be translated using the disclosed circuit. The biasing circuit can be formed using either inverters or transmission gates. Moreover, the biasing circuit, the inverter chain stage, and the amplifier stage can be connected to a power down circuit which, when the translator is not being used, will ensure various circuitry of the translator will not consume extensive power. The inverter chain stage, biasing circuit, and capacitor stage are formed on both an upper and lower section to produce true and complementary outputs that have a consistent and equal delay from the transitions of the incoming differential input signal so as to minimize jitter and associated duty cycle of the translated output.

A test circuit, system, and method are provided herein for testing one or more circuit components arranged upon a monolithic substrate. According to one embodiment, the system may include a test circuit and one or more circuit components, all of which are arranged upon the same monolithic substrate. In general, the test circuit may be configured for: (i) receiving an input signal at an input frequency, (ii) generating a test signal by modulating a phase of the input signal in accordance with a periodic signal, and (iii) supplying either the input signal or the test signal to the one or more integrated circuits, based on a control signal supplied to the test circuit. More specifically, the test circuit may be used to determine the jitter and/or duty cycle distortion (DCD) tolerance of any system component without changing the frequency of the clock signal supplied to the component or injecting noise into the clock recovery system.

One embodiment relates to an integrated circuit which includes a transmitter buffer circuit, a duty cycle distortion (DCD) detector, correction logic, and a duty cycle adjuster. The DCD detector is configured to selectively couple to the serial output of the transmitter buffer circuit. The correction logic is configured to generate control signals based on the output of the DCD detector. The duty cycle adjuster is configured to adjust a duty cycle of the serial input signal based on the control signals. Another embodiment relates to a method of correcting duty cycle distortion in a transmitter. Other embodiments and features are also disclosed.

A method and system for modeling and calibrating duty cycle distortion (DCD) of a Serializer and Deserializer (SerDes) device, including first generating a clock DCD signal. Once the clock DCD signal is generated, it is calibrating based upon results obtained from a filtering process of the clock DCD signal. Once the clock DCD signal is calibrated, a data DCD signal is generated and calibrated based upon results obtained from a filtering process of the data DCD signal.

A level shifter apparatus and method for minimizing duty cycle distortion are provided. The level shifter includes a bank of comparators each having an associated threshold built into it. The comparators compare a difference in source voltages for two power domains to these built-in thresholds and output a signal indicative of whether the threshold is exceeded. The output signals from the comparators are provided to a thermometric decoder which generates control signals based on these output signals. The control signals are used to control stages in a level shifter for modifying the voltage output of the level shifter. Individual stages may be enabled to thereby monotonically modify the voltage output of the level shifter and thereby decrease a time required to achieve a voltage having a level that causes a state change in a driven circuit. As a result, duty cycle distortion is minimized and maximum operational frequency is increased.

An apparatus for and method of removing duty cycle distortion jitter from data by adaptive equalization are disclosed. The apparatus includes an equalization circuit which equalizes input data based on an equalization control signal, a signal analysis circuit, and a control circuit which generates the equalization control signal. A multiport apparatus includes a plurality of equalization circuits, a multiplexor, a signal analysis circuit, and a control circuit. A method includes the steps of receiving an equalization control signal and the input data signal, equalizing the input data signal based on the equalization control signal, analyzing the equalized data signal and generating an analysis result signal, and generating the equalization control signal based on the analysis result signal.

A clock buffer circuit of a semiconductor device is disclosed which receives an external clock signal and generates an internal clock signal with no duty distortion. The clock buffer circuit includes a first clock buffer for receiving and buffering a normal-phase clock signal, a second clock buffer for receiving and buffering a reverse-phase clock signal, and an internal clock generator for generating an internal clock signal in response to output signals from the first and second clock buffers.

A transimpedance amplifier (TIA) circuit usable for burst mode communications is provided. The TIA circuit includes a TIA stage, a limiter-amplifier, and a DC restoration loop. The invention overcomes problems of the prior art relating to burst communications, such as a DC level in the output signal which can change from burst to burst and a duty-cycle distortion in large signals. This is achieved by using a DC restoration loop that ensures achieving zero DC potential within variable acquisition periods.

Duty-cycle correction circuits, clock distribution networks, and methods for correcting duty-cycle distortion are disclosed, including methods and apparatus for correcting duty-cycle distortion of differential output clock signals provided from a clock distribution network. In one such method, a single-ended clock signal is generated from differential input clock signals for distribution over a clock distribution network and from which the differential output clock signals are generated. A delay of a model delay path is matched to a propagation delay of the clock distribution network, and the single ended clock signal is adjusted to compensate for duty-cycle distortion.

Correction of duty cycle distortion of DQ and DQS signals between a memory controller and a memory is corrected by determining a duty cycle correction factor. The duty cycle distortion is corrected by applying the duty cycle correction factor to the plurality of differential DQS signals. The duty cycle distortion is corrected across a plurality of differential DQS signals between the memory controller and the bursting memory.

Programmable duty cycle adjustment circuitry may be provided to correct for duty cycle distortion in serial data transmission systems. Duty cycle adjustment may be performed prior to transmitting data signals across a transmission medium. Duty cycle adjustment may also be performed as it is received from the transmission medium. Programmable duty cycle adjustment circuitry may be configured to adjust the rising and falling edges of data signals. Programmable duty cycle adjustment circuitry may also be configured to adjust the common mode level of data signals. The amount of duty cycle adjustment may be determined by end-users or through negative feedback.

A technique for compensating for duty cycle distortion in an output data signal generated by a synchronous dynamic random access memory device (SDRAM) is provided. The output latch of the SDRAM is driven by an output clock signal generated by a delay lock loop (DLL). The output clock signal is phase-shifted relative to a reference clock signal received by the DLL such that the data removed from the output latch is synchronous with the reference clock signal. Further the duty cycle of the output clock signal is adjusted in a phase inverse relationship to the duty cycle distortion introduced by the output latch. As a result, the output data signal has reduced duty cycle distortion.

A differential amplifier includes an input stage, a biasing unit and a load unit. The input stage receives a first phase signal and at least two phase signals among odd-numbered phase signals, wherein an average of phases of the at least two phase signals has a phase difference of substantially 180 degrees from the first phase signal. The biasing unit is coupled between the input stage and a first power voltage. The load unit is coupled between the input stage and a second power voltage, and configured to output a differential output signal based on differentially amplifying of the first phase signal and the at least two phase signals. Therefore, a duty cycle distortion in an output signal of a duty cycle correction circuit can be prevented.