18 results about "Gain–bandwidth product" patented technology

The invention discloses a self-stabilization zero operational amplifier circuit free from input imbalance and common mode influence, relates to the technical field of integrated circuits, and is applied to a high-precision operational amplifier. The operational amplifier is a three-stage operational amplifier and mainly comprises a single auxiliary input end zeroing amplifier, a main amplifier and an output stage. After a zero setting auxiliary input end of a traditional zero setting amplifier is changed into single-end input from differential input and a zero setting input stage is subjected to multi-stage design, an offset voltage of 3.8 microvolts, a low-frequency gain of 189dB and a gain bandwidth product of 8.6 MHz are realized under power consumption of 400 microamperes, the phase margin of the operational amplifier is 78 degrees under unit gain, and the stability requirement is met. Compared with a traditional structure, the low-residual-offset operational amplifier has the advantages that lower residual offset and larger operational amplifier bandwidth are achieved, and the application range is wider.

The invention provides a closed-loop D-class amplifier loop, a differential closed-loop D-class amplifier loop, audio equipment and electronic equipment, the loop comprises a first-stage integrator, a second-stage integrator, a pulse width modulation module and an H-bridge module which are electrically connected in sequence, and a feedback module, the first end of the feedback module is coupled to the input end of the first-stage integrator, and the second end of the feedback module is coupled to the input end of the second-stage integrator. The second end of the feedback module is coupled to the output end of the H-bridge module, the feedback module comprises a feedback capacitor and a feedback resistor which are connected in parallel, a zero point is formed, and the zero point is designed within the frequency range between one time and two times of the gain bandwidth product. The feedback capacitor is connected to the feedback resistor in parallel, so that zero points in a loop are increased, and the system stability of the class-D amplifier is improved when the class-D amplifier is in a no-load state or the connected inductive load is large.

The application discloses a kind of low noise and high gain bandwidth product operational amplifier circuit, it is related to the technical field of electronic circuit, it solves the technical problem of the low noise and high gain bandwidth product operational amplifier circuit urgently needed at present.The circuit includes input stage, bias stage and output stage connected in turn;The output stage is push-pull structure, the bias stage is used to provide bias for the output stage;Feedback loop is arranged between the bias stage and the output stage, for determining the current of the output stage;Phase compensation stage is arranged between the feedback loop and the output stage, for providing phase compensation for output stage.The application not only can reduce the noise of circuit output stage, but also can improve the gain bandwidth product of operational amplifier.

The invention discloses a low-noise and high-gain-bandwidth-product operational amplifier circuit, relates to the technical field of electronic circuits, and solves the technical problem that the low-noise and high-gain-bandwidth-product operational amplifier circuit is urgently needed at present. The circuit comprises an input stage, a bias stage and an output stage which are connected in sequence, the output stage is of a push-pull structure, and the bias stage is used for providing bias for the output stage; a feedback loop is arranged between the bias stage and the output stage and is used for determining the current of the output stage; and a phase compensation stage is arranged between the feedback loop and the output stage and is used for providing phase compensation for the output stage. Noise of the circuit output stage can be reduced, and the gain bandwidth product of the operational amplifier can be improved.

The invention discloses a low-noise operational amplifier based on current multiplexing, relates to the technical field of radio frequency integrated circuits, and solves the technical problems of limited gain bandwidth product and conversion rate, high static power consumption and lack of dynamic power consumption adjustment capability. According to the technical scheme, the circuit is characterized by comprising a first adaptive biasing circuit, a first amplifying circuit, a second amplifying circuit, a multiplexing current adaptive circuit, a current multiplexing circuit and the like, wherein an active buffer circuit is arranged between the first amplifying circuit and the second amplifying circuit. The first adaptive bias circuit adjusts bias voltage by using signal strength, and the second adaptive bias circuit is provided with an analog control and power detection circuit. And the current multiplexing circuit cooperates with each part and comprises a self-adaptive adjustment mechanism. According to the invention, the gain bandwidth product and the conversion rate are improved through current multiplexing and active buffering, and the noise is reduced; power consumption is reduced through self-adaptive bias; the bias monitoring and current detection feedback control circuit ensures the stability; and the method has flexibility and adaptability, and can efficiently process signals and save energy.

The invention belongs to the field of integrated circuits, and particularly relates to a JFET (Junction Field Effect Transistor) input operational amplifier suitable for high-speed weak current detection, which comprises a first biasing circuit, a second biasing circuit, a third biasing circuit, a fourth biasing circuit, a fifth biasing circuit and a sixth biasing circuit, the product of the gain of the differential input stage circuit and the gain of the intermediate amplification stage circuit is used as the gain of the amplifier, the complementary push-pull output stage circuit and the intermediate amplification stage circuit adopt a folded common-emitter common-base structure with emitter feedback, and the intermediate amplification stage circuit converts two differential signals output by the differential input stage circuit into single-ended signals. The complementary push-pull output stage circuit further converts the single-ended signal into an output signal of the amplifier. The problems of a trans-impedance amplifier with high gain bandwidth product, high slew rate, low noise and low input bias current required during high-speed weak current detection in the prior art are solved.

The application provides a folded cascode amplifier, an integrated circuit, a chip and an electronic device. The folded cascode amplifier comprises a bias circuit configured to provide a bias current according to a bias voltage, a first input differential unit and a second input differential unit arranged symmetrically, a folded cascode unit, and a fifth group of current mirrors connected to the folded cascode unit. The folded cascode unit comprises a first group of cascode tubes and a second group of cascode tubes, and a first group of current mirrors to a fourth group of current mirrors. The first group of cascode tubes comprises a first output transistor and a first load current tube connected in series, the second group of cascode tubes comprises a second output transistor and a second load current tube connected in series, and the first group of current mirrors multiplexes the first load current tube, and the fourth group of current mirrors multiplexes the second load current tube. The folded cascode amplifier improves the transconductance, the slew rate, the conversion rate and the gain-bandwidth product through the proportional cooperation of the several groups of current mirrors.

The invention discloses a second-order Sallen Key filtering successive approximation analog-to-digital converter design method and system, and relates to the technical field of analog-to-digital conversion. Comprising the steps that a second-order Sallen Key low-pass filter is selected, and the gain and the quality factor of an operational amplifier are determined; obtaining a second-order Sallen Key low-pass filter topological structure which comprises a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and an operational amplifier used for unity gain configuration; obtaining a transfer function according to the parameters of the second-order Sallen Key low-pass filter; determining a capacitance value, and then obtaining a resistance value based on the capacitance value and a second-order Sallen Key low-pass filter design formula; obtaining the minimum gain bandwidth product and slew rate of the required operational amplifier according to the cut-off frequency and the signal amplitude; and obtaining a DAC architecture, and obtaining a digital-to-analog converter DAC according to the SAR ADC precision index. By optimizing the structure and parameters of the filter, the anti-aliasing performance and the signal conversion precision of the ADC are improved, and the power consumption and the cost are reduced at the same time.

This invention discloses an operational amplifier based on a cyclic folded cascode architecture, relating to the field of analog circuit technology, to address the problems of low energy efficiency in existing folded cascode amplifiers and limited energy efficiency improvement in cyclic folded cascode structures. It includes a differential input transistor, a current mirror, an adaptive bias circuit, and an output stage. The adaptive bias circuit is connected to the differential input transistor, and the current mirror is connected to both the differential input transistor and the output stage. The adaptive bias circuit includes a flip-flop voltage follower. The current mirror is used for current recycling and zero-point compensation, and the output stage is used to output amplified signals. The adaptive bias circuit includes a flip-flop voltage follower to improve the dynamic performance of the amplifier. Zero-point compensation can improve the phase margin of the circuit, further improving the gain-bandwidth product. Compared to traditional operational amplifiers, the operational amplifier of this invention can achieve higher bandwidth and higher energy efficiency with lower power consumption.

The present invention discloses a device for resonant balanced zero-beat detection of weak light, comprising a first photodiode, a second photodiode, a transimpedance amplifier circuit, a frequency-selective inductor, a frequency-selective capacitor, a secondary voltage amplifier circuit, a filter resistor, a filter capacitor and a direct current in-phase proportional amplifier circuit; the photoelectric detection device responds only at the resonant frequency, thus avoiding the limitation of the gain-bandwidth product of the amplifier chip and also having high gain at high frequencies.

The present invention discloses a signal receiving system, method, device and storage medium, belonging to the field of information processing technology. The system comprises a superconducting quantum interference device, which is used to generate a first electrical signal when an electromagnetic signal is detected; a signal processing circuit, wherein the signal processing circuit comprises a target circuit unit having a target gain-bandwidth product; the signal processing circuit is used to amplify the first electrical signal into a second electrical signal based on the target circuit unit; the signal processing slew rate of the signal processing circuit is adapted to the target gain-bandwidth product; a signal analysis module, which is used to perform signal analysis on the second electrical signal, and determine a Schumann resonance signal based on the signal analysis result. The beneficial effect is that the Schumann resonance signal can be stably detected, the signal-to-noise ratio of the test result is improved, and the detection is simple.

An amplifier circuit is provided. The amplifier circuit includes a first transimpedance amplifier and a first transconductance amplifier. The first transimpedance amplifier is to receive a first input signal. A first input of the first transconductance amplifier is coupled to a first output of the first transimpedance amplifier. The first transconductance amplifier includes a first passive feedback structure and a first active feedback structure. The first passive feedback structure includes a first resistor coupled between the first output of the first transimpedance amplifier and the first input of the first transimpedance amplifier. The first active feedback structure includes a first inverter having an output coupled to the first input of the first transimpedance amplifier. This configuration optimizes the gain-bandwidth product and stability of the amplifier circuit.

The utility model discloses a weak echo signal post-processing circuit for a CMUT sensor. A forward voltage input module is sequentially connected with a power supply port of a forward input end of a power supply of an echo signal I-V conversion amplification module and a power supply port of a forward input end of a power supply of an eight-order Butterworth band-pass filtering module; the reverse voltage input module is sequentially connected with a power supply port of a power supply reverse input end of the echo signal I-V conversion amplification module and a power supply port of a power supply reverse input end of the eight-order Butterworth band-pass filtering module; and the output port of the echo signal I-V conversion amplification module is connected to the input port of the eight-order Butterworth band-pass filtering module. The utility model meets the requirement that the input bias voltage and current are as small as possible, reduces the power consumption, and reduces the load of the signal source; and the gain bandwidth product meets the range requirement of ultrasonic detection.

This invention discloses a high-bandwidth, notch-free hybrid magnetocurrent sensor circuit, comprising a low-frequency path, a high-frequency path, a differential amplifier, a compensation path, and a dual-to-single converter. The low-frequency path utilizes a Hall effect sensor and auxiliary bias circuitry to detect the low-frequency component of the current, and simultaneously suppresses sensitivity drift and common-mode drift by replicating a negative temperature coefficient voltage. In the high-frequency path, the integrator consists of two paths with the same gain-bandwidth product but different low-frequency gains, and gain flatness is improved through compensation technology. The servo loop employs active capacitor amplification technology, using small-area resistors and capacitors to achieve ultra-low-frequency poles. The outputs of the high- and low-frequency paths are combined via a differential amplifier and then pass through a subtractor and a high-pass filter to form a compensation path for eliminating chopper ripple. Finally, the signals are converged in the dual-to-single converter to obtain a notch-free broadband output. This invention simultaneously solves problems such as chopper notch, gain unevenness caused by pole-zero mismatch, and the use of large-area passive components.

The invention provides a fully differential operational amplifier circuit, which comprises a differential operational amplifier unit, a first compensation unit and a second compensation unit, and is characterized in that the first compensation unit is connected between the drain end of a differential input tube in the differential operational amplifier unit and the corresponding differential output end of the differential input tube; the second compensation unit is connected between the drain end of the other differential input tube in the differential operational amplifier unit and the corresponding differential output end; wherein the first compensation unit and the second compensation unit have the same circuit structure and comprise a first capacitor, a second capacitor, a first resistor, a second resistor and a third resistor, the first end of the first capacitor is connected with the drain end of the corresponding differential input tube, and the second end of the first capacitor is connected with the first end of the second capacitor to form an intermediate node; the second end of the second capacitor is connected with the corresponding differential output end through the first resistor. The second resistor and the third resistor are connected in series between the intermediate node and the reference ground. According to the invention, the problem of extra current power consumption caused by increasing the gain bandwidth product of the operational amplifier circuit by increasing the current in the prior art is solved.

The invention belongs to the technical field of communication, and particularly relates to a low-pass and complex-band-pass switchable multimode configurable filter based on a three-stage operational amplifier. The main body structure of the filter is Tow-Thomas, a Chebyshev function is adopted as an approximation function, and the filter comprises two three-stage operational amplifiers and a capacitance-resistance array. The filter has multiple working modes, and different modes are realized by changing the codes of the capacitor array and the resistor array. Antipole split compensation and nested Miller compensation are combined to be used for a three-stage operational amplifier, and the gain bandwidth product of the operational amplifier is increased under the condition that power consumption is not increased; gain tuning and pre-stage output resistance are decoupled by designing an input resistor array, so that the independence of the gain tuning is improved. Configuration and switching of multiple working modes of the active filter are effectively achieved, and the active filter can be applied to receivers of multiple working modes such as satellite communication and navigation and has the advantages of being low in noise, high in linearity, small in-band ripples, easy to integrate, high in practicability and the like.

The invention provides a closed-loop class-D amplifier loop, a differential closed-loop class-D amplifier loop, audio equipment and electronic equipment, a second-stage integrator of the loop comprises a second amplifier, a second resistance-capacitance network and a third resistance-capacitance network, and the second resistance-capacitance network comprises a second resistor and a second capacitor which are connected in parallel. The first end of the second resistance-capacitance network is coupled to the output end of the first-stage integrator, and the second end of the second resistance-capacitance network is coupled to the input end of the second amplifier; the third resistor-capacitor network comprises a third resistor and a third capacitor which are connected in series, the first end of the third resistor-capacitor network is coupled to the input end of the second amplifier, the second end of the third resistor-capacitor network is coupled to the output end of the second amplifier, and the third resistor-capacitor network forms a second zero point; and the zero point is designed in a frequency range between one time and two times of the gain bandwidth product. According to the invention, the second zero point is formed, so that the system stability of the class-D amplifier is improved when the class-D amplifier is in a no-load state or an accessed inductive load is relatively large.

The present invention belongs to the technical field of integrated circuits, and relates to an amplifier with feedforward compensation, including a differential signal main circuit, two feedforward circuits, two compensation circuits and two common-mode feedforward circuits; the differential signal main circuit includes a first-stage differential amplifier and two second-stage single-stage amplifiers; the input ends of the feedforward circuits and the input ends of the common-mode feedforward circuits are respectively connected to the first input end of the differential signal main circuit; the output ends of the feedforward circuits and the output ends of the common-mode feedforward circuits are electrically connected to the output end of the differential signal main circuit; compensation circuits are arranged in parallel at both ends of the second-stage single-stage amplifier. The present invention utilizes the first-stage differential amplifier and two second-stage single-stage amplifiers, and at the same time utilizes two sets of feedforward circuits as additional signal input paths, and utilizes two sets of common-mode feedforward circuits as additional signal inputs, which can effectively improve the gain-bandwidth product and loop relative margin of the circuit.