Operational Amplifier Circuit

A technology of operational amplifiers and amplifiers, applied in amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc., can solve the problems of decreased anti-power interference ability, decreased steady-state accuracy of operational amplifiers, and increased system errors, achieving high PSRR, The effect of high gain and accelerated charge and discharge speed

Active Publication Date: 2022-02-01
BRIGATES MICROELECTRONICS KUNSHAN
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  • Abstract
  • Description
  • Claims
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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

Method used

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Embodiment Construction

[0023] In practical applications, one use of operational amplifiers is to drive large capacitive loads such as figure 1 as shown, figure 1 It is a schematic diagram of an operational amplifier circuit driving a load in the prior art. The non-inverting input terminal Vip of the operational amplifier is connected to the input signal source, and its inverting input terminal Vin is connected to the output node Vo. In addition, the output node Vo is also connected to the load capacitance The upper plate of CL.

[0024] figure 2 It is a structural schematic diagram of an operational amplifier circuit in the prior art. The operational amplifier circuit includes: a plurality of MOS transistors M10-M118, a non-inverting input terminal Vip1 and an inverting input terminal Vin1. The output node Vo1 of the operational amplifier circuit is connected to the load capacitor CL1.

[0025] figure 2 Compared with the traditional operational amplifier circuit, the loop-folding cascode oper...

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Abstract

An operational amplifier circuit, comprising: a loop folded cascode amplifier, the loop folded cascode amplifier includes two folded tubes, a cascode current mirror and a load capacitor, the cascode current mirror The gates are connected correspondingly, each branch of the cascode current mirror and each of the two folded tubes are respectively connected in series with the first node and the second node, and one end of the load capacitor is connected to the first node, The other end is grounded; it also includes: a dynamic acceleration circuit, which is suitable for making the The output voltage of the operational amplifier circuit accelerates to follow the input voltage. In the operational amplifier circuit provided by the present invention, by adding the dynamic acceleration circuit, the driving speed of the operational amplifier circuit is greatly improved without increasing the static power consumption.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45
CPCH03F3/45206H03F2203/45124
Inventor 黄从朝
Owner BRIGATES MICROELECTRONICS KUNSHAN
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