13results about How to "Increase slew rate" patented technology

The invention provides a pixel signal output circuit and an image sensor, and the circuit comprises a pixel module which is used for generating a pixel signal; and the feedback capacitance module is connected with the output end of the pixel module and is used for equivalently reducing the total load capacitance of the pixel module so as to accelerate the establishment of a pixel signal. The feedback capacitor module is additionally arranged at the output end of the pixel module, and the total load capacitance of the pixel module is equivalently reduced by utilizing the capacitance of the feedback capacitor module, so that the time constant of the pixel signal output circuit can be effectively reduced, the slew rate is increased, the establishment speed of the pixel signal is accelerated, and the pixel signal output efficiency is improved. The problem of how to improve the establishment speed of the pixel signal is solved.

The invention belongs to the field of integrated circuits, and provides a folded cascode structure operational amplifier circuit with low power consumption and high slew rate, which is used for solving the problems of low slew rate, high power consumption and the like in the prior art. The flip voltage follower comprises current sources I0-I4, transistors M1-M14, a resistor R1 and a load capacitor CL, and on the basis of a traditional folded cascode structure, a flip voltage follower differential structure (DFVF) composed of transistors M4, M7 and M8, a flip voltage follower current sensor (FVFCS) composed of transistors M3, M4 and M8, and a source follower composed of a transistor M14 and the current source I4 are introduced. The DFVF is used for improving the discharge current of the load capacitor in the negative conversion stage, and meanwhile, the FVFCS is used for improving the charge current of the load capacitor in the positive conversion stage, so that the slew rate of the operational amplifier circuit is greatly improved, and under the condition, the maximum tail current of differential input can reach more than one hundred times of the current of the middle stage; therefore, the power consumption of the operational amplifier circuit is obviously reduced.

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.

This invention discloses an operational amplifier circuit for improving slew rate in the field of integrated circuit technology. It includes a basic op-amp unit, a positive-phase slew rate enhancement circuit, and a negative-phase slew rate enhancement circuit. The basic op-amp unit includes an input stage, a common-source common-gate stage, and a Class AB output stage. The output terminal of the input stage is connected to the first input terminal of the common-source common-gate stage, and the output terminal of the common-source common-gate stage is connected to the input terminal of the Class AB output stage. By introducing positive-phase and negative-phase slew rate enhancement circuits and their respective bias circuits, this invention can dynamically adjust the charging and discharging current of the frequency compensation capacitor according to the input voltage. This does not affect the normal operation of the circuit when the op-amp is operating stably. When a large signal step occurs at the input, the slew rate enhancement circuit is rapidly activated, increasing the current of the common-source common-gate stage, accelerating the charging and discharging process of the compensation capacitor, and improving the slew rate of the circuit.

The application discloses a wideband low-power consumption transconductance operational amplifier with enhanced slew rate, which comprises an improved cyclic folded transconductance operational amplifier and a slew rate enhancement circuit. The slew rate enhancement circuit can significantly improve the positive and negative slew rates during large signal operation of the amplifier. During small signal operation of the amplifier, the transistors thereof work in a subthreshold region and hardly consume current, so that the unit gain bandwidth and the slew rate of the amplifier can be improved while keeping low power consumption, thereby improving the working speed and output current capacity of the operational amplifier. The embodiment of the application improves the working speed of a high-performance switched capacitor circuit, reduces power consumption, is easy to popularize and use, and can be widely applied to the technical field of operational amplifiers.

The invention relates to a source measurement circuit and a voltage output method, the source measurement circuit comprises a voltage output module, an acceleration module, a current detection module and a load module, the voltage output module is connected with the load module through the current detection module, and the acceleration module is connected with the current detection module in parallel; the voltage output module is used for outputting a first voltage signal, and the first voltage signal represents the voltage at the two ends of the load module; the acceleration module is used for accelerating the process that the first voltage signal reaches the target voltage; and the acceleration module is in a conducting state in the change process of the first voltage signal, and is in a cut-off state after the first voltage signal reaches the target voltage. According to the source measurement circuit, the acceleration module accelerates the process that the voltage at the two ends of the load module reaches the target voltage, the output slew rate is improved, and the establishment time of the output voltage is shortened.

The invention discloses a low-dropout linear voltage regulator based on damping coefficient control, and belongs to the technical field of linear voltage regulators. The low dropout linear regulator comprises a first-stage amplification circuit, a second-stage amplification circuit, a power-stage circuit and a damping coefficient control circuit. The damping control circuit is added between the second-stage amplifier circuit and the power-stage circuit to adjust a damping factor, so that the linear voltage regulator can obtain good stability and transient characteristics, and in addition, the structure can be used for a structure without an off-chip capacitor and can also be used for a structure with the off-chip capacitor. And the outer capacitor structure is arranged outside the outer capacitor structure.

The invention relates to the field of integrated circuit design. In order to enable an operational amplifier to quickly drive a large capacitive load, the invention provides a self-adaptive slew rate enhanced input stage circuit. The circuit has relatively low power consumption during small-signal working, but provides relatively high conversion current during large-signal conversion, so that the slew rate is remarkably improved. Therefore, the slew rate is obviously enhanced on the premise that the static power consumption is not increased.

The invention discloses an LVDS (Low Voltage Differential Signaling) driving circuit with a slew rate control function for an image sensor. The LVDS driving circuit comprises a three-stage current driving unit and a delay unit, the three-stage current driving unit is used for receiving input voltage in stages, converting the input voltage into output current and outputting the output current in stages; the delay unit is connected with the input end of the three-stage current driving unit, and the input end of the three-stage current driving unit is provided with resistors with different resistance values, so that the three-stage current driving unit receives input voltages with different delays and receives the input voltages in stages. According to the embodiment of the invention, the input voltage is controlled to be input in stages, and then the output current is controlled to be output in stages, so that overlarge current is prevented from being generated at a certain moment, slew rate control during signal conversion is realized, and finally, signals at the input end are fully established, and signal noise at the output end is reduced.

This invention discloses a dynamic slew rate enhancement circuit for high-speed operational amplifiers, belonging to the field of operational amplifiers. The circuit includes PNP transistors Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, and Q11, capacitors C1 and C2, and resistor R1. This circuit enables the tail current of the operational amplifier's input stage to increase as the difference in the input differential signal increases, thereby improving the operational amplifier's speed, especially significantly increasing the slew rate under large signal input conditions.

The application discloses a kind of based on translinear loop full differential operational amplifier common mode feedback circuit and full differential operational amplifier, belong to operational amplifier technical field.The application is applied to full differential operational amplifier, including common-mode voltage detection amplifier, output voltage division unit and feedback signal input unit;Common-mode voltage detection amplifier converts the difference between the common-mode voltage of the differential output end of the detected full differential operational amplifier and the target common-mode reference voltage into a differential current signal, converts it into a feedback control voltage through the output voltage division unit, and inputs the gain stage front end of the full differential operational amplifier through the feedback signal input unit, to form a negative feedback closed loop.The application embeds common-mode feedback circuit into main gain loop, improves feedback depth with the help of main amplifier high gain, realizes high bandwidth, high linearity output common mode precision control under low static power consumption, at the same time simplifies circuit structure, can improve the working stability of full differential operational amplifier under various non-ideal working conditions.

The utility model discloses a power amplifier for a hydrophone performance testing device, and belongs to the technical field of hydrophone testing. Comprising a signal input end for receiving the sinusoidal signal, a power amplification circuit for performing power amplification on the sinusoidal signal, and a signal output end for outputting the sinusoidal signal after power amplification; the power amplification circuit comprises a power amplification chip, the signal input end is connected with an in-phase input pin of the power amplification chip, and an output pin of the power amplification chip is connected with the signal output end; an output pin of the power amplifier chip is sequentially connected with a first resistor, a second resistor and the ground in series, and the first resistor and the second resistor are connected with the reverse input end through a wire. The low-level signal processing circuit has the advantages that the low-level signal processing performance is good, and high signal-to-noise ratio precision is kept when weak input signals are processed; and the working voltage range is wide, and the current limit is adjustable.

This invention discloses a common-mode feedback circuit for a fully differential operational amplifier based on a transconductance linear loop and a fully differential operational amplifier, belonging to the field of operational amplifier technology. This invention is applied to a fully differential operational amplifier, including a common-mode voltage detection amplifier, an output voltage divider unit, and a feedback signal input unit. The common-mode voltage detection amplifier converts the difference between the detected common-mode voltage at the differential output terminal of the fully differential operational amplifier and the target common-mode reference voltage into a differential current signal. This signal is then converted into a feedback control voltage by the output voltage divider unit and input to the gain stage front end of the fully differential operational amplifier via the feedback signal input unit, forming a negative feedback closed loop. This invention embeds the common-mode feedback circuit into the main gain loop, leveraging the high gain of the main operational amplifier to enhance the feedback depth. This achieves high-bandwidth, high-linearity, and precise common-mode control of the output with low quiescent power consumption, while simplifying the circuit structure and improving the operational stability of the fully differential operational amplifier under various non-ideal operating conditions.