Operational amplifier circuit

Abstract

The invention provides an operational amplifier circuit. The operational amplifier circuit comprises a recycling folded cascode amplifier, wherein the recycling folded cascade amplifier comprises twofolded tubes, cascode current mirrors and a load capacitor, the grids of the cascode current mirrors are correspondingly connected, each branch of the cascode current mirrors and each of the two folded tubes are respectively in series connection with a first node and a second node, one end of the load capacitor is connected with the first node, and the other end is grounded. The operational amplifier circuit further comprises a dynamic acceleration circuit, which is suitable for helping the output voltage of the operational amplifier circuit accelerate to follow the input voltage when an inputvoltage of the recycling folded cascode amplifier jumps from the low level to the high level or from the high level to the low level. According to the operational amplifier circuit provided by the invention, due to the additionally arranged dynamic acceleration circuit, the actuating speed of the operational amplifier circuit is largely improved when the static power consumption is not increased.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to an operational amplifier circuit. Background technique [0002] Operational amplifiers have extremely extensive and important applications in the field of integrated circuits. Operational amplifiers with different structures have their own advantages and disadvantages, so their applicable fields are also different. One of the most common cases is that the operational amplifier needs to drive a large capacitive load, and with the continuous development of various electronic devices, the load capacitance of the operational amplifier in the corresponding integrated circuit design is getting larger and larger, but the speed is required to be higher. The higher the increase, the higher the static power consumption of the op amp and the larger the chip area. For an operational amplifier, an increase in static power consumption means a decrease in gain. The decrease in gai...

AI Technical Summary

Problems solved by technology

For an operational amplifier, an increase in static power consumption means a decrease in gain. The decrease in gain will not only decrease the steady-state accuracy of the operational amplifier, but also result in a decrease in the power supply rejection ratio (PSRR, PowerSupplyRejection Ratio) of the operational amplifier. The error (offset) will increase accordingly, and the ability to resist power supply interference will decrease

In short, the increase in static power consumption is contradictory to the requirements of various modern electronic devices for low power consumption and low cost

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