An Error Amplifier Circuit with Switched Capacitor Compensation

A technology of error amplifiers and switched capacitors, applied in amplifiers, improved amplifiers to reduce temperature/power supply voltage changes, high-efficiency power electronics conversion, etc., can solve problems such as increasing system area and cost, inability to integrate, and increasing chip pins, etc., to achieve Reduce system area, wide application range, avoid pin effect

Active Publication Date: 2022-06-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

C CC Usually nF to uF level is required, which cannot be integrated into the system, but can only be plugged in, which not only increases the chip pins, but also increases the system area and cost

Method used

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  • An Error Amplifier Circuit with Switched Capacitor Compensation
  • An Error Amplifier Circuit with Switched Capacitor Compensation
  • An Error Amplifier Circuit with Switched Capacitor Compensation

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Embodiment Construction

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] like figure 2 Shown is a schematic structural diagram of an error amplifier circuit with switched capacitor compensation proposed by the present invention, wherein the first operational amplifier OP1 is the main circuit of the error amplifier, and the first resistor R1 and the second resistor R2 are used to determine the low-frequency gain of the loop , the third resistor R3, the first transmission gate TG1, the second transmission gate TG2, the third transmission gate TG3, the first capacitor C1 and the second capacitor C2 are the components of the switched capacitor compensation scheme, and the second operational amplifier OP2 is used as a buffer The buffer circuit (BUFFER) prevents subsequent circuits from drawing current from here, affecting loop compensation. The first operational amplifier OP1 and the second operational amplifier O...

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Abstract

An error amplifier circuit with switched capacitor compensation, the positive input terminal of the first operational amplifier is connected to a reference voltage, the negative input terminal is connected to one terminal of a second resistor and connected to the application system output sampling after passing through the first resistor, and the output terminal is connected to the second The other end of the resistor, one end of the third resistor, and one end of the second capacitor; one end of the first transmission gate is connected to the other end of the third resistor, and the other end is connected to one end of the second transmission gate and the positive input end of the second operational amplifier, and grounded after passing through the first capacitor ; One end of the third transmission gate is connected to the other end of the second transmission gate and the other end of the second capacitor, and the other end is connected to the negative input end and output end of the second operational amplifier and is used as the output end of the error amplifier circuit; the present invention combines clock control three The transmission gate is turned on and off, thereby changing the capacitance and resistance of the access system to achieve equivalent capacitance amplification, ensuring that the phase margin of the system is sufficiently stable under the internal integrated compensation scheme with small capacitance, taking into account reliability and area cost .

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and relates to an error amplifier circuit with switched capacitor compensation, which can be applied to a DC-DC converter to realize loop stability. Background technique [0002] In recent years, the continuous development of modern power electronic technology has promoted the vigorous development of industrial control instruments, automotive electronics, and personal consumer electronics markets, and the rapidly growing Internet of Things and increasingly complex electronic systems such as portable devices are the market demands for power management ICs. It has brought a strong impetus and put forward strict requirements. The most common type of power management IC is the DC-DC converter of switching power supply. Due to its high power efficiency, fast response speed, large input and output voltage range, and the ability to output large current, etc. In practical applications...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/30H02M3/00
CPCH03F1/303H02M3/00H02M1/0016H02M1/0003Y02B70/10
Inventor 周泽坤肖志平许王帅王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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