17 results about "Programmable-gain amplifier" patented technology

A zero intermediate frequency receiver and wireless communication equipment, the zero intermediate frequency receiver comprises a direct current offset correction circuit and a data receiving link, the data receiving link comprises a trans-impedance amplifier, a low pass filter, a programmable gain amplification circuit and an analog-to-digital converter which are connected in series, the DC offset correction circuit comprises a control module, a first correction module, a second correction module and a third correction module. And the control module is suitable for determining a first target calibration value, a second target calibration value and a third target calibration value based on the DC offset on the data receiving link, outputting the first target calibration value to the first correction module, outputting the second target calibration value to the second correction module, and outputting the third target calibration value to the third correction module. According to the scheme, high-precision correction of the zero intermediate frequency receiver can be realized.

The present application relates to the technical field of electronic circuit, and especially relates to a readout circuit of a terahertz detection array, which comprises: a readout link at least comprising a current feedback instrumentation amplifier, a programmable gain amplifier and an incremental analog-to-digital converter connected in sequence; the current feedback instrumentation amplifier amplifies the signal output by the detector and outputs a first-stage amplified signal, the current feedback instrumentation amplifier comprises an instrumentation amplifier body and a first ripple suppression module, the first ripple suppression module comprises a first redundant segmented current steering DAC and a first DAC code register; the programmable gain amplifier further amplifies the first-stage amplified signal, the programmable gain amplifier comprises a gain amplifier body and a second ripple suppression module, and the second ripple suppression module comprises a second redundant segmented current steering DAC and a second DAC code register. The present application effectively reduces the chip area and power consumption while ensuring that the readout circuit of the terahertz detection array has high gain, low noise and low offset.

The application discloses a programmable gain amplifier and a control method thereof. The programmable gain amplifier comprises a first differential amplifier circuit, a first set of gain resistors, a second set of gain resistors, a set of sampling capacitors, a first set of switches and a second differential amplifier circuit. The first set of switches is used for selectively coupling the first set of gain resistors between an inverting input voltage and an input of the first differential amplifier circuit, coupling the second set of gain resistors between a common-mode voltage source and the input of the first differential amplifier circuit, and coupling the set of sampling capacitors with respective outputs of the first differential amplifier circuit during a first stage of an offset calibration of the first differential amplifier circuit. Through storage of the sampling capacitors and negative feedback of the second differential amplifier circuit, an offset voltage on the first differential amplifier circuit is offset, so that the influence of the offset voltage on a front-stage amplifier circuit on detection accuracy can be effectively reduced.

This application provides a frequency-modulated continuous wave lidar system, comprising a programmable gain circuit and a laser. The programmable gain circuit includes a control module, a digital-to-analog converter module, and a programmable gain amplifier. The laser generates a detection beam. The control module generates a digital signal and controls the gain of the programmable gain amplifier according to the modulation bandwidth of the laser. The programmable gain amplifier, in response to the gain control of the control module, amplifies the analog signal to match the modulation bandwidth of the laser and uses the amplified analog signal as a modulation signal to modulate the detection beam. The modulated detection beam is emitted into the detection space. This application solves the problem of high resource requirements of the back-end receiving system in related technologies' frequency-modulated continuous wave lidar systems, thereby achieving optimal bandwidth modulation and ranging effects.

The present application belongs to the technical field of analog circuit, and particularly relates to a programmable gain amplifier suitable for a high-precision ADC front end. The programmable gain amplifier of the present application adopts a whole differential structure, and comprises a whole differential amplifier. The amplifier completes the function of signal amplification, and has the characteristics of high gain and high linearity. The switches of the network of the switching feedback resistance and capacitance all adopt transmission gate switches, so as to reduce the channel charge injection effect of the switches and the nonlinearity of the on-resistance of the switches. The feedback network of the programmable gain amplifier changes the size of the feedback resistance and capacitance through the transmission gate and the resistance-capacitance combination, so as to realize the control of the gain. The input signal is amplified by the accurate amplification multiple, and meanwhile the size of the feedback resistance and capacitance is impedance-matched, so as to ensure that the-3dB bandwidth of the whole programmable gain amplifier remains basically unchanged, so that the working speed of the programmable gain amplifier under different gain conditions remains consistent, and the linearity is greatly improved.

A programmable gain amplifier that comprises: a transconductance amplifier, a switch leakage compensation circuit and a transimpedance amplifier. The transconductance amplifier provides a transconductance amplifier current signal and includes a switchable resistance network. The switch leakage compensation circuit provides a compensation current signal and comprises a switchable compensation resistance network. The transimpedance amplifier provides the output voltage signal based on the difference between the transconductance amplifier current signal and the compensation current signal. The switchable compensation resistance network comprises a plurality of branches in parallel with each other, wherein each branch includes: a gain-mimicking switch that has a corresponding gain-setting switch in the switchable resistance network; and a leakage-current-conducting switch in series with the gain-mimicking switch. The leakage-current-conducting switch is openable and closable in accordance with the complement of a switch control signal that is used to control the gain-mimicking switch in the same branch.

A circuit includes an analog-to-digital converter (ADC). The circuit also includes an analog front end (AFE, 310) having an AFE input and an AFE output. The AFE output is coupled to an input of the ADC. The AFE includes a programmable gain amplifier (PGA, 115) having a first PGA input and a second PGA input. The PGA (115) includes a first operational amplifier (OP AMP, OP1) having first and second OP AMP inputs. The AFE (310) also includes a programmable resistance circuit (320) having a first programmable resistance circuit input and first and second programmable resistance circuit outputs. The first programmable resistance circuit input is coupled to the first and second PGA inputs. The programmable resistance circuit (320) includes a resistor network having first and second balancing resistances. The first balancing resistance is coupled to the first and second OP AMP inputs, and the second balancing resistance is coupled to the first and second OP AMP inputs.

This invention discloses an image processing circuit for autonomous vehicles, belonging to the field of image processing technology. It solves the problems of unexpected refraction and scattering of light due to physical defects in optical microlenses and color filters, and charge coupling caused by parasitic capacitance in pixel units, leading to leakage of optical / electrical signals from a single pixel to adjacent pixels, resulting in color aliasing and blurred image edges. The circuit includes a main image sensor module, a reference image sensor module, and an analog signal preprocessing and multiplexing module. This invention coordinates the synchronous signal acquisition of the main and reference image sensors through a low-jitter clock distribution module. After integration by the analog signal preprocessing module, a dynamic crosstalk compensation module generates an inverse compensation signal based on the reference signal. A high-precision differential correlation dual sampling module then performs noise suppression and crosstalk elimination on the main signal. Finally, a programmable gain amplifier module outputs the purified differential signal.

A circuit includes a Sallen-Key filter and a programmable gain amplifier coupled to the Sallen-Key filter, the Sallen-Key filter including a source follower implementing a unity gain amplifier. The circuit is capable of implementing a programmable gain that decouples the bandwidth of the circuit from its gain setting via adjustment of a current mirror replication ratio in the programmable gain amplifier. The programmable gain amplifier can include a differential voltage-to-current converter, a current mirror pair, and a programmable output gain stage. At least one leg in the Sallen-Key filter and the programmable gain amplifier can include transistors arranged in the same circuit configuration.

Some embodiments of the specification provide a design method and system for load adaptation of power amplifier products. The method comprises: determining a load impedance value based on an output voltage signal and an output current signal; determining a target gain based on the load impedance value; and controlling a programmable gain amplifier of a pre-stage circuit to adjust a hardware gain based on the target gain.

The application discloses a low-power-consumption tire pressure monitoring circuit and method, and relates to the technical field of tire pressure monitoring, in particular to a low-power-consumption tire pressure monitoring circuit and method. The circuit comprises a normal-open power supply domain, a power-off power supply domain 1 and a power-off power supply domain 2; the power-off power supply domain 2 comprises a CPU and an acceleration sensor; the normal-open power supply domain comprises a counter, a main state machine and a register; the power-off power supply domain 1 comprises a pressure sensor, a secondary state machine, a programmable gain amplifier, a comparator, a DAC, an ADC and a threshold value detection and alarm circuit; the CPU stores a mode flag into the register before sleeping; the main state machine periodically wakes up the power-off power supply domain 1, turns on the power supply and performs air pressure measurement; the secondary state machine compares the air pressure measurement result with a threshold value range at least once, and performs alarm processing or adjusts the counting period of the counter according to the comparison result. The application can independently and automatically complete the periodic sampling and monitoring of the tire air pressure in the completely sleeping state of the CPU without software intervention through a special hardware processing circuit, and effectively reduces the power consumption.

The present application relates to the technical field of sensors, and in particular to a voltage and current sensor intelligent monitoring and adaptive compensation method, system, device and storage medium. The signal characteristic spectrum is analyzed through fast Fourier transform, the multiple of the programmable gain amplifier and the filter parameter are dynamically adjusted, the problems of signal saturation and weak interference suppression under different working conditions are solved, the filtering effect and the anti-interference ability are improved; the error type is identified through multi-dimensional identification of basic deviation, statistical deviation and spectral deviation, the matching algorithm is adaptively selected, the error type is dynamically adjusted, the problem of insufficient accuracy of the full frequency band is solved, and the demand of new energy grid connection and other wide frequency band measurement scenes is met; through the double safety limit value, combined with the preset root cause library characteristic map to locate the root cause, the problems of frequent false alarm and missed alarm, difficult root cause positioning and low operation and maintenance efficiency are solved, the root cause positioning accuracy is improved, and it is helpful for operation and maintenance personnel to prioritize processing high-risk faults according to the warning level.

A communication anti-interference method based on interference amplification cancellation mode, comprising a transmitter, an interference machine and a receiver, the interference machine transmits interference signals to the transmitter and the receiver, the transmitter re-modulates the received interference signals according to the amplification factor by using a programmable gain amplifier according to the transmitted information bits, generates a transmission signal and transmits it to the receiver, and the receiver performs energy detection based on the received interference signals from the interference machine and the transmission signals from the transmitter to eliminate interference.

The application relates to a programmable gain amplifier circuit for extending the dynamic range of an image sensor, comprising a switched capacitor circuit and a negative feedback DC offset cancellation circuit; the switched capacitor circuit is used for twice correlated double sampling and amplification processing of the output signal of the image sensor pixel column, eliminating the fixed pattern noise and reset thermal noise, and outputting high-sensitivity and low-sensitivity analog voltages; the negative feedback DC offset cancellation circuit is used for reducing the influence of the offset voltage of the main operational amplifier on the output voltage by adopting an operational amplifier offset voltage storage mode. In the application, the image column fixed pattern noise caused by the offset voltage of the main operational amplifier can be greatly reduced through the operational amplifier offset storage technology, and the high-sensitivity and low-sensitivity analog signal inputs can be provided for the post-processing circuit in time through the twice correlated double sampling processing technology, so that the dynamic range of the image sensor is extended, and the image imaging quality is improved.

The application discloses a high-precision linear decibel programmable gain amplifier and a control method. The high-precision linear decibel programmable gain amplifier comprises a segmented attenuation network, a plurality of transconductance stage arrays, a digital logic control module, an adjustable current bank and an output amplifier. The segmented attenuation network is used for receiving a differential input signal and discretely attenuating the differential input signal into a plurality of groups of attenuation signals with equal decibel intervals. The plurality of transconductance stage arrays are used for receiving the plurality of groups of attenuation signals. The digital logic control module is used for receiving a plurality of digital gain control words and generating a gating signal and a control signal. The gating signal is used for gating two adjacent transconductance amplifiers in the plurality of transconductance stage arrays. The control signal is used for distributing current between the two adjacent transconductance amplifiers. The adjustable current bank is used for distributing total tail current to the two adjacent transconductance amplifiers according to the control signal. The output amplifier is used for collecting output currents of all the transconductance amplifiers through a feedback network and outputting a final linear decibel gain signal. The application fundamentally eliminates the influence of process, voltage and temperature fluctuations on gain accuracy.

The application discloses a high signal-to-noise ratio signal acquisition method and device for electrocardio-cardiac sound integration, and belongs to the technical field of biomedical signal acquisition. The circuit adopts two instrument amplifiers to collect electrocardio signals and cardiac sound signals respectively, and fuses a programmable gain amplifier-low pass filter fusion circuit and an analog-to-digital converter through a switch array time-sharing multiplexing. The instrument amplifier integrates chopping modulation and an auxiliary loop to suppress noise and improve input impedance; the fusion circuit adopts a switched capacitor topology to realize programmable adjustment of gain and bandwidth. A clock manager uniformly controls channel switching and circuit parameter reconfiguration. The application realizes high signal-to-noise ratio synchronous acquisition of double-mode signals, and has low power consumption, small area and good wearable integration characteristics.