7results about How to "Increase slew rate" patented technology

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.

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.

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.