2108 results about "Feedback circuits" patented technology

The invention discloses a high-current wide-capacitance-range LDO (Low Dropout Regulator) based on a frequency compensation circuit. The LDO comprises a first-stage operational amplifier, a second-stage operational amplifier and a third-stage operational amplifier The secondary operational amplifier is used for carrying out secondary amplification on the amplified error signal; the driving circuit is used for enhancing the driving capability of the error signal subjected to secondary amplification; the current output circuit is used for adjusting the output current of the output demand according to the secondary amplified error signal with the enhanced driving capability and the input voltage; the feedback circuit is used for generating new feedback voltage according to the output current; the first-stage operational amplifier is also used for amplifying a new error signal; and the frequency compensation circuit is used for adjusting the positions of a plurality of zero poles in the new error signal according to the output current by utilizing the multi-zero pole dynamic compensation branch and the current buffer compensation branch so as to offset a secondary pole and widen the whole unit gain bandwidth at the same time to obtain an adjusted error signal. According to the invention, a large bandwidth can still be obtained in a large current output range and a large load capacitance range.

A method for equalizing a data signal includes providing a data signal to a pair of input transistors that provides an output signal, contributing to the output signal, a first current or voltage that has a magnitude determined by a first weighted feedback signal using a first decision-feedback circuit that includes a first pullup circuit coupled to a drain of a first input transistor, and a first pulldown circuit coupled to the drain of the first input transistor, and contributing to the output signal, a second current or voltage that has a magnitude determined by a second weighted feedback signal using a second decision-feedback circuit that includes a second pullup circuit coupled between a drain of a second input transistor and the first voltage rail, and a second pulldown circuit coupled between the drain of the second input transistor and a second voltage rail.

The invention discloses a high-power all-gallium nitride LED driving power supply circuit which comprises an EMI filtering and rectifying circuit, a GaN active power factor correction circuit, a GaN half-bridge LLC resonant converter circuit and a GaN synchronous rectifying and filtering circuit. The PFC and LLC combined control module integrates a power factor correction function and a resonance circuit frequency regulation function, the GaN active power factor correction circuit is connected with the PFC and LLC combined control module to realize power factor correction, and the GaN half-bridge LLC resonant converter circuit is connected with the PFC and LLC combined control module to realize output power regulation; and a constant-current voltage-limiting feedback circuit for outputting current and voltage detection feedback is arranged between the GaN synchronous rectification filter circuit and the PFC and LLC combined control module. The advantages of high efficiency of the GaN switching tube and high working frequency of the circuit are utilized, so that power loss and heat dissipation requirements are reduced, and the efficiency and power density of the LED power supply are improved. The invention has the advantages of high efficiency, high power density, high reliability and the like.

The embodiment of the invention provides a closed-loop control method for power driving and protection, and the method comprises the steps: constructing a voltage feedback type circuit through a high-speed operational amplifier, and forming a closed-loop gain structure through a feedback network of the voltage feedback type circuit; the load current of the output end of the voltage feedback type circuit is monitored in real time, and when the load current exceeds a first set threshold value, a protection mechanism is triggered to turn off the output stage; the power-on surge current is limited through the soft start control circuit; phase information of a load reflection coefficient is obtained, an inductance / capacitance combination of the variable dynamic impedance matching network is selected according to phase information table look-up, inductance / capacitance parameters are switched through a relay, and the transmission standing-wave ratio between the power amplifier and a load is optimized; monitoring the temperature of the radiating fin of the power tube, and dynamically adjusting the resistance value of the feedback network; and performing cooperative control of short-circuit protection, over-temperature protection and surge suppression according to the priority. According to the embodiment of the invention, the performance bottleneck in a load fluctuation scene is broken through.

The invention provides a common-mode feedback circuit and a differential amplifier thereof, the common-mode feedback circuit comprises a sampling circuit and an amplifier circuit, the sampling circuit comprises a first input end, a second input end and a first output end, the first input end receives a first differential signal Voutp, and the second input end receives a second differential signal Voutn; the level shift module comprises a third input end, a fourth input end and a second output end, receives a common-mode signal VCMS and a reference common-mode signal VOCM output by the sampling circuit, and adjusts the common mode of the common-mode signal VCMS and the reference common-mode signal VOCM to enable the second output end to output a common-mode feedback signal VCMFB processed by the level shift module; the amplifier circuit receives a common mode feedback signal VCMFB. After the technical scheme is adopted, the same speed as that of a differential loop can be realized, the current of a main operational amplifier can be multiplexed, the power consumption of a common-mode loop is far lower than that of a main loop, and meanwhile, the common-mode level can be randomly adjusted.

According to the driving control circuit for the electrostatic chuck power supply and the electrostatic chuck power supply, the driving control circuit is arranged in the electrostatic chuck power supply, a high-voltage output voltage signal of a high-voltage amplifying circuit can be obtained through a signal generating and processing feedback circuit, and according to a negative feedback adjusting mechanism, the driving control circuit is used for driving the electrostatic chuck power supply. A power supply waveform control signal for controlling a high-voltage amplification circuit to output a high-voltage output voltage signal is adjusted, and the high-voltage output voltage signal output by the high-voltage amplification circuit is adjusted to be output, so that the effect of controlling the signal precision of the high-voltage output voltage signal output by the electrostatic chuck power supply is achieved, and the output stability of the electrostatic chuck power supply is improved. Therefore, the stability of an electrostatic field generated by the electrostatic chuck is guaranteed, and the wafer fixing process precision of the electrostatic chuck is ensured.

A control device for a switching voltage regulator includes: a first detector of a first measurement signal indicative of a current flowing in a first side of the regulator, and providing a first comparison signal as a function of a first threshold; a second detector of a second measurement signal indicative of a current flowing in a second side of the regulator, and providing a second comparison signal as a function of a second threshold; a driving-signal generation circuit which generates a switching control signal from the first comparison signal to drive the switching circuit; a calibration circuit which receives an alert signal indicative of the first threshold, compares the alert signal and the second comparison signal, and provides a calibration signal in response; and a feedback circuit which provides a control signal as a function of an error signal and of the calibration signal.

The invention provides a fully differential operational amplifier circuit and an operational amplifier. The fully differential operational amplifier circuit comprises an input stage circuit, a gain stage circuit and a common-mode feedback circuit, the input stage circuit is used for processing a differential input voltage signal, converting the differential input voltage signal into a differential current signal and transmitting the differential current signal to the gain stage circuit; the gain stage circuit is used for performing gain processing on the differential current signal and outputting a target differential voltage signal; the common-mode feedback circuit is used for detecting the common-mode voltage of the target differential voltage signal, generating a common-mode feedback signal and transmitting the common-mode feedback signal to the gain-stage circuit to stabilize the common-mode voltage; wherein the gain stage circuit comprises a gain enhancement circuit, and the gain enhancement circuit is used for increasing the output impedance of the gain stage circuit. According to the chopping operational amplifier, the input stage circuit, the gain stage circuit, the common mode feedback circuit and the gain enhancement circuit are combined, so that the precision and the sensitivity of the chopping operational amplifier are improved.

The invention provides a switch state detection circuit and a power supply system, the power supply system comprises a power supply end, a load end and a to-be-detected switch arranged between the power supply end and the load end, and the to-be-detected switch is used for connecting / disconnecting a path between the power supply end and the load end. The switch state detection circuit comprises an isolation power supply, a voltage detection circuit and a voltage feedback circuit. The isolation power supply and the to-be-tested switch form a current loop when the to-be-tested switch is closed so as to provide voltage isolated from the power supply end for the to-be-tested switch. The voltage detection circuit outputs a voltage detection signal according to the voltage output by the isolation power supply; the voltage feedback circuit outputs a voltage feedback signal according to the level state of the voltage detection signal. According to the invention, a high-cost auxiliary switch is replaced by a low-cost voltage detection circuit and a low-cost voltage feedback circuit, and the detection of the switch state is realized through the software and hardware combination of the voltage detection circuit and the voltage feedback circuit, so that the space of a circuit board is saved, and the circuit design cost is reduced.

The invention belongs to the technical field of direct current monitoring, and discloses a TMR-based open-close type direct current leakage current detection device, which comprises a magnetic core, one or more pairs of TMR sensors, a secondary side feedback coil and a main control circuit, and is characterized in that the magnetic core is provided with air gaps which are oppositely arranged; the TMR sensors are symmetrically arranged in the air gap; the secondary side feedback coil is wound on the surface of the magnetic core and forms closed-loop control with the main control circuit; the main control circuit comprises an acquisition feedback circuit, a secondary side detection circuit and a main control chip, the acquisition feedback circuit acquires signals of the TMR sensor under the control of the main control chip, generates feedback current and inputs the feedback current to the secondary side feedback coil, and the secondary side detection circuit is connected between the secondary side feedback coil and the main control chip. And the main control chip collects the secondary side voltage of the secondary side detection circuit and calculates to obtain the direct current leakage current. According to the invention, direct current leakage current detection with high sensitivity, low drift and strong anti-interference capability is realized under the open-close structure, and the requirements of a modern electric power system on continuity, safety and maintainability are met.

The invention discloses a direct current SSPC current limiting control system and a control method thereof, and relates to the field of power electronics and electricians. The RC network generates a control voltage according to the switch control signal; the driving power amplification circuit carries out power amplification processing on the control voltage; the main power circuit conducts or cuts off the branch power distribution channel according to the processed voltage so as to provide a current path; the current-limiting state judgment circuit judges whether to enter or exit a current-limiting state according to information data fed back by the feedback circuit, and outputs a signal to the current closed-loop current-limiting control circuit; and the current closed-loop current-limiting control circuit receives the signal output by the current-limiting state judgment circuit and adjusts a control voltage corresponding to a main branch power tube in the RC network according to the SSPC channel current so as to realize constant-current control of the power distribution channel. The invention aims to improve the stability and thermal reliability of direct current SSPC current-limiting control.

The invention provides a correlated double-sampling program-controlled gain amplifier for a high-energy particle detection pixel sensor and an implementation method, and solves the technical problem that a large dynamic range and high readout precision cannot be considered at the same time during existing high-energy particle detection. The circuit comprises a correlated double-sampling circuit, a signal polarity conversion circuit, an amplification feedback circuit and a configuration automatic judgment circuit. The correlated double sampling circuit is used for performing double sampling on the output voltage of the pixel signal to obtain twice sampling voltage; the configuration automatic judgment circuit is used for selecting configurations for switching according to the voltage difference between the two sampling voltages to obtain an output signal; and the amplification feedback circuit is used for performing fixed gain voltage amplification on the output signal to obtain an amplified voltage signal. The circuit can be widely applied to the technical field of integrated circuits.

The invention discloses an electric energy discharge control device. The energy storage circuit is used for storing potential storage electric energy; the bleeder circuit is used for releasing the potential storage electric energy through a bleeder resistor and a bleeder transistor which are connected in series; the reference voltage setting circuit is used for outputting a reference voltage signal; the bleeder sampling feedback circuit is used for outputting a bleeder sampling feedback electric signal according to the bleeder sampling current of the bleeder resistor; the post-stage voltage feedback circuit is used for outputting a post-stage voltage feedback electric signal according to the potential storage voltage; and the conduction degree of the discharge transistor is controlled according to the post-stage voltage feedback electric signal, the reference voltage signal and the discharge current collection feedback electric signal. The conduction degree of the bleeder transistor is dynamically controlled according to the bleeder current collection feedback electric signal and the post-stage voltage feedback electric signal, so that the change of potential storage electric energy of the energy storage device is dynamically adapted, the bleeder power and the current of the bleeder circuit are stable and controllable, and a higher bleeder rate can be realized under the condition that the bleeder power and the current are kept unchanged.

The utility model provides a test system for Mini LED drive chips, which is applied to the technical field of liquid crystal display and specifically comprises a host, an FPGA (field programmable gate array) master control module, a plurality of Mini LED drive chips, a plurality of cement resistors and a plurality of LED lamp beads with the same number as the cement resistors, then, through a mode of adding a cement resistor and an LED lamp bead in each channel of each Mini LED driving chip, the test requirement difference of different clients is considered on the test system, and through a mode of further adding an FPGA main control module, an automatic return circuit mechanism is added in the test system; wherein the host is in communication connection with the FP GA main control module through one path of UART bus so as to send a test signal to the FPGA main control module or receive the running state of each Mini LED driving chip returned by the FPGA main control module in real time, so that high-temperature and high-humidity accurate test and automatic recording of test results are realized, manpower and material resources are saved, and the test efficiency is improved.

A voltage meter includes a sampler, a gain circuit, an accumulator and a feedback circuit. The sampler samples an input signal to generate a series of first signals and a series of second signals. The gain circuit, coupled to the sampler, modifies at least one of the series of first signals and the series of second signals, to generate a series of modified first signals and a series of modified second signals. The accumulator, coupled to the gain circuit, accumulates an operational result of the series of modified first signals and the series of modified second signals, to generate an accumulation result. The feedback circuit, coupled between the accumulator and the sampler, sends a feedback signal back to the sampler according to the accumulation result.

An adaptive IGBT active drive circuit is divided into two parts: a gate drive circuit, and a feedback circuit. The gate drive circuit includes a totem pole unit, and multi-level resistance switching is achieved by using a totem pole parallel structure. The feedback circuit includes a comparison unit, and a logic unit. The comparison unit includes divided resistors, sampling resistors, and a comparator. Internal currents, after passing through the sampling resistor, are compared with current comparison thresholds of complementary transistors to output a digital signal to participate in control of the totem pole. The logic unit is responsible for logically combining a PWM signal and a signal output by the comparison unit to obtain a driving signal of the totem pole.

The invention discloses a laser radar transmitting circuit with pulse width compensation and a control method thereof. The circuit comprises an optical pulse transmitting circuit and a pulse width sampling control signal feedback circuit. The method comprises the following steps: generating a starting pulse signal and exciting an optical pulse transmitting circuit to output a laser pulse signal according to the starting pulse signal; comparing the laser pulse signal with a reference voltage, and outputting a square wave pulse signal; capturing the square wave pulse signal to obtain time interval data; carrying out calculation according to the time interval data to obtain the pulse width of the laser pulse current and carrying out output voltage regulation processing to obtain a signal feedback quantity; and performing feedback regulation on the output voltage of the optical pulse transmitting circuit according to the signal feedback quantity. According to the embodiment of the invention, pulse width acquisition and adjustment of the optical pulse current can be realized, so that the pulse width stability of the optical pulse current is improved. The laser radar transmitting circuit can be widely applied to the technical field of laser radar transmitting circuits.

The invention discloses a PWM-based motor signal feedback control method and device, and the device comprises a signal feedback circuit which is disposed on a motor or can be connected with the motor so as to receive a motor feedback signal, and can output a control signal. The method comprises the following steps: setting N different first function relational expressions established by motor state feedback signals and PWM duty ratios d in a main control board, and defining a PWM duty ratio range for each first function relational expression, and the PWM duty ratio ranges are not overlapped; setting A different second function relational expressions established by the motor state feedback signals and the PWM frequency f in the main control board, and defining a PWM frequency f range for each second function relational expression, and the PWM frequency ranges are not overlapped; the main control board accurately adjusts the target value of the motor in real time according to the multiple motor state feedback signals, meanwhile, the hardware structure of the main control board and the hardware structure of the motor are simplified, and cost is reduced.

The invention discloses a soft start control circuit and method, a resonant transformation control circuit and electronic equipment, and the soft start control circuit comprises a charge feedback circuit which obtains a charge feedback signal through employing a resonant output signal; the voltage feedback circuit is used for obtaining a voltage feedback signal by utilizing a difference value between the power supply output signal and the target reference voltage; the logic control circuit is used for generating a first control signal in a first starting stage; in a second starting stage, generating a second control signal by adopting the maximum preset switching frequency and the adjustable dead time; in a third start-up stage, slope compensation is performed on the voltage feedback signal to obtain a feedback adjustment signal, and a third control signal is generated by using the feedback adjustment signal and the charge feedback signal; the logic control circuit adjusts the inverter AC signal by using the first to third control signals. By means of the mode, the soft start control circuit is high in dynamic response speed, small in starting current and simple in control logic.

The invention relates to the technical field of power supply circuits, and discloses a gallium nitride power chip power supply which comprises an AC input, an EMI filter circuit, a gallium nitride power switch, a switch transformer, a rectification filter circuit, a DC output, a voltage detection feedback circuit, a PWM control circuit, a current limiting circuit and a temperature protection circuit. The AC input, the EMI filter circuit, the gallium nitride power switch, the switch transformer, the rectification filter circuit and the DC output are connected in sequence; the rectification filter circuit is also connected with the voltage detection feedback circuit, and the voltage detection feedback circuit is connected with the PWM control circuit. The output end of the gallium nitride power switch is further connected with the circuit limiting circuit, and the current limiting circuit is connected with the PWM control circuit through the temperature protection circuit. The power supply of the gallium nitride power chip provided by the invention has the advantages of more stable output, larger adjustment range, stronger anti-interference capability and better overload and temperature protection performance.

The invention discloses a fan speed regulation circuit, including a feedback circuit for obtaining the motor temperature and adjusting the fan enable signal and then outputting it; a compensation circuit 1 for obtaining the fan enable signal and the fan speed and then outputting a level signal after comparison; and a compensation circuit 2 for obtaining the level signal and adjusting the fan speed. The invention realizes dynamic regulation, does not occupy DSP resources, uses a PWM control chip to adjust the fan PWM control signal, and then achieves the purpose of speed regulation, has a simple circuit, and requires fewer power devices; has a high switching frequency, is easy to be continuous in current, has fewer harmonics, and has relatively small losses and heat generation; has good low-speed performance, high steady-speed accuracy, and a wide speed regulation range; the power switch device works in a switching state, has a small conduction loss, and when the switching frequency is appropriate, the switching loss is also small, so the efficiency is high.

Integrated circuit transceivers having digital timing recovery loops with phase interpolation may incorporate dynamic loop gains to compensate for nonlinearities of the phase interpolation. An illustrative receiver circuit includes: a phase interpolator, a sampling element, a timing error estimator, and a feedback circuit. The phase interpolator provides a sampling signal by applying a phase shift to a clock signal in response to a phase control signal. The sampling element produces a digital receive signal by sampling an analog receive signal in accordance with the sampling signal. The timing error estimator produces a timing error signal indicating an estimated timing error of the sampling signal relative to the analog receive signal. The feedback circuit derives the phase control signal from the timing error signal using a scaling element configured to scale the estimated timing error by a scale factor that depends on the phase control signal.

The invention discloses an intelligent maintenance method and device for an industrial printer and a storage medium. The method comprises the following steps that S1, circuits of printer components are modularly integrated; S2, sensors of the printer components are modularly integrated; S3, feedback circuits of a nozzle circuit module, a paper feeding circuit module and an ink box circuit module are arranged; s4, setting sensor feedback signal channels of the nozzle group, the paper feeding group and the ink box group; s5, establishing a real-time monitoring and analyzing system for a feedback circuit and a feedback signal; S6, establishing an analysis model; the problem that an existing printer detection system cannot predict printer faults and fault prognosis is solved, the purpose of intelligent printer maintenance integrating maintenance and detection is achieved, and through circuit and sensor modular integration and feedback setting, the state of each component can be accurately captured in real time, and abnormity can be found in time.

The invention discloses a continuous time linear equalizer which comprises a transconductance circuit, a transimpedance amplifier circuit and a common-mode voltage feedback circuit. The transconductance circuit comprises a pair of PMOS (P-channel Metal Oxide Semiconductor) tubes, a pair of NMOS (N-channel Metal Oxide Semiconductor) tubes, six current sources and two RC (Resistance-Capacitance) networks; two branches are arranged between the power supply and the ground. A grid electrode of the first PMOS tube is connected with a grid electrode of the first NMOS tube, a grid electrode of the second PMOS tube is connected with a grid electrode of the second NMOS tube, and the first PMOS tube and the second PMOS tube respectively receive a pair of differential input voltages. The drain electrode of the first PMOS tube is connected with the drain electrode of the first NMOS tube, the drain electrode of the second PMOS tube is connected with the drain electrode of the second NMOS tube, and a pair of differential intermediate signals is output respectively. The circuit is simple in structure and only has a primary circuit; a complementary structure of PMOS input geminate transistors and NMOS input geminate transistors is adopted, bias current is utilized to the maximum extent, power consumption is low, and compared with a traditional circuit, the current utilization rate is improved; balancing of a wide frequency band can be realized under the condition of low power consumption, and the gain is high.

In a calibrated digital phase-locked-loop (DPLL) circuit, during a normal operating mode, a control value provided to a digitally controlled oscillator (DCO) is updated by a feedback circuit to keep an output clock generated by the DCO synchronized with a reference clock. The feedback circuit includes a time-to-digital converter (TDC) circuit to measure a phase difference as a time interval. In a calibration operating mode of the calibrated DPLL circuit, calibration of a resolution of a time measurement of the time interval measured by the TDC is performed in the feedback circuit while the control value provided to the DCO is kept constant. Calibrating the TDCs in each of the DPLLs in an integrated circuit (IC) to a nominal resolution in this manner improves synchronization of the clock domains. In some examples, the TDC circuit is a Vernier type circuit and calibration sets a delay difference to a nominal resolution.

The invention provides a low-noise amplification circuit, a radio frequency front-end module and an electronic terminal.The low-noise amplification circuit comprises an input matching adjustment circuit, a common-source amplification circuit, a first inductor, an inter-stage feedback circuit, a common-gate amplification circuit, an input and output feedback circuit, an output matching adjustment circuit and an output attenuation circuit; the common-source amplification circuit comprises at least two first signal amplification units; each first signal amplification unit comprises a first field effect transistor; the common-gate amplification circuit comprises at least two second signal amplification units; and each second signal amplification unit comprises a second field effect transistor. According to the low-noise amplification circuit, transconductance nonlinearity of devices under different bias signals can be mutually counteracted, so that the linearity fluctuation of the low-noise amplification circuit at different temperatures is optimized, and the linearity of the low-noise amplification circuit is kept basically not to change along with the temperature change.

The invention relates to the technical field of dust combustion, and provides a dust explosion combustion experiment device in order to solve the problems that an existing dust explosion combustion experiment device is insufficient in parameter control precision, and an experiment multi-focus single variable lacks a dust removing mechanism and a safety protection measure, and the dust explosion combustion experiment device comprises an experiment table which is provided with a power chamber and an equipment chamber; one side of the experiment table is hinged with an access door, two sides of the top of the experiment table are provided with conveying main pipes extending to the equipment chamber, a power supply assembly is arranged in the electric power chamber; the protective shell assembly comprises an outer shell and an inner shell; a plurality of exhaust pipes are arranged at the top of the inner shell; the dust generation assembly comprises a plurality of dust storage tanks and an air compressor; the ignition control assembly comprises a pulse igniter, a flame detection feedback circuit and an ignition head; the environment adjusting assembly comprises a box body, an oxygen tank and a humidifier, wherein the oxygen tank and the humidifier are arranged in the box body. The device has the advantages that the dust concentration is accurately regulated and controlled, the environmental parameters are dynamically coupled and controlled, dust residues are rapidly removed, and the experiment safety is high.

The invention provides a level shifter and a memory device including the same. The level shifter includes: a medium voltage output circuit configured to output a medium voltage based on an input voltage stepped between a first voltage level and a second voltage level; a feedback circuit configured to output a feedback voltage and an output voltage stepped between a positive target voltage level and a negative target voltage level based on the positive target voltage, the negative target voltage, and the medium voltage; a pull-up voltage control circuit configured to output the first voltage or the positive target voltage to the medium voltage output circuit based on the feedback voltage; and a pull-down voltage control circuit configured to output the second voltage or the negative target voltage to the medium voltage output circuit based on the feedback voltage.

The invention relates to a power supply feedback control circuit, a switching power supply and electronic equipment. The power supply feedback control circuit is connected with the switching power supply module and comprises a voltage regulation controller and a voltage regulation circuit which are connected with each other, and the voltage regulation circuit is connected with a feedback node of a feedback circuit of the switching power supply module. And the voltage regulation controller is used for acquiring the target voltage of the target load and regulating the circuit state of the voltage regulation circuit based on the target voltage so as to regulate the voltage of the feedback node, so that the switching power supply module outputs the target voltage according to the voltage of the feedback node. By connecting the power supply feedback control circuit to the feedback node, the switching power supply modules of various resonant transformation topologies can be controlled to output corresponding voltages according to the requirements of electric equipment, so that a plurality of DC-DC conversion modules at the rear ends of the resonant transformation topologies can be omitted, the circuit structure is simplified, meanwhile, the size of charging equipment is reduced, and the cost is reduced. And the requirement of small-size development of fast-charging products is met.

Fast sampling phase and frequency acquisition suitable for incorporation into various high bandwidth receivers and receiving methods. One illustrative integrated circuit receiver or “deserializer” design has: a clock circuit that provides a sample clock; an analog to digital converter that samples a receive signal in accordance with the sample clock to provide receive signal samples; and a clock recovery circuit. The clock recovery circuit includes: a phase and frequency acquisition module to determine and correct an initial frequency offset and an initial phase offset of the sample clock; and a feedback circuit to minimize timing error of the sample clock after the initial frequency offset and initial phase offset have been corrected.