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Miller compensation circuit and electronic circuit

A Miller compensation and Miller capacitance technology, applied in the field of electronics, can solve the problems of the compensation instability of the Miller compensation circuit, and achieve the effect of improving the compensation stability and compensation effect.

Active Publication Date: 2017-05-31
GUANGZHOU HUIZHI MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of this, the embodiment of the present invention expects to provide a Miller compensation circuit and an electronic circuit, and expects to solve the compensation instability problem of the existing Miller compensation circuit

Method used

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  • Miller compensation circuit and electronic circuit
  • Miller compensation circuit and electronic circuit
  • Miller compensation circuit and electronic circuit

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0073] Such as image 3 As shown, this example provides a Miller compensation circuit including a differential amplifier 100 , an output transistor 102 , a feedback network 112 and a load 114 .

[0074] The inverting input terminal of the differential amplifier 100 is connected to the input signal VIN, the non-inverting input terminal F of the differential amplifier 100 is connected to the output of the feedback network 112, the output terminal of the differential amplifier 100 is connected to the input terminal B of the output transistor 102, and the output terminal of the output transistor 102 The second terminal E is connected to the output VOUT, the third terminal of the output transistor 102 is connected to the power supply 1, the input terminal of the feedback network 112 is connected to the output VOUT, and the load 114 is between the output VOUT and the power supply 2; it includes a non-inverting gain circuit 106, which is characterized by non-inverting The gain circui...

example 2

[0109] Such as Figure 6 As shown, this example provides a Miller compensation circuit. The output transistor is realized by the PMOS transistor 200; the follower is realized by the PMOS transistor 300; the PMOS transistor 400 constitutes an output current sampling circuit, and the drain current of the PMOS transistor 400 is the sampling current ISNS; the resistor 402 and the resistor 404 constitute a feedback circuit, The output node E is the input of the feedback circuit, and the node F is the output of the feedback circuit; the resistor 408 and the capacitor 406 form a load; the input and output terminals of the non-inverting gain circuit are shorted, so the small signal gain from input to output is A=1. At this point the second pole of the feedback loop is:

[0110]

[0111] The left half plane zero of the feedback loop is:

[0112]

[0113] by ω zero =α*ω p2 ,Available

[0114]

[0115] This formula has nothing to do with the current IO of the output transis...

example 3

[0117] Such as Figure 7 As shown, this example provides another Miller compensation circuit, the output transistor of which is realized by the PNP transistor 202; the follower is realized by the NPN transistor 306; the PNP transistor 500, the NPN transistor 502, and the NPN transistor 504 form an output current sampling circuit, The collector current of the NPN transistor 504 is the sampling current ISNS; the current source 506 and the PNP transistor 508 form a non-inverting gain circuit, and the small signal gain from input to output is A=1; the current source 510 and the capacitor 512 form a load; the feedback network The input and output terminals are shorted. At this point the second pole of the feedback loop is:

[0118]

[0119] The left half plane zero of the feedback loop is:

[0120]

[0121] by ω zero =α*ω p2 , we can get α=M.

[0122] This formula has nothing to do with the current IO of the output transistor, so when the current of the output transistor...

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PUM

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Abstract

The embodiment of the invention discloses a miller compensation circuit and an electronic circuit. The compensation circuit comprises a differential amplifier, an output transistor, a load, a miller capacitor, a follower and a current sampling circuit, wherein the negative input end of the differential amplifier is used for receiving an input signal of the miller compensation circuit; the positive input end of the differential amplifier is connected with the output end of the output transistor; the output end of the differential amplifier is respectively connected with the output transistor and the miller capacitor; the first end of the output transistor is connected with a first power supply; the second end of the output transistor is connected with the output end of the differential amplifier; the third end of the output transistor is a voltage output end and is respectively connected with the positive input end and the load; the other end of the load is connected with a second power supply; the other end of the miller capacitor is simultaneously connected with the output end of the current sampling circuit and the output end of the follower; the output end of the follower is connected with the output end of the miller capacitor and the output end of the current sampling circuit; the current sampling circuit is used for sampling first current of the output transistor.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a Miller compensation circuit and an electronic circuit. Background technique [0002] Feedback loops are widely used in electronic circuits, such as voltage regulators, phase-locked loops, and analog-to-digital converters used on a large scale in the industry are all based on feedback loops. However, the feedback loop often appears unstable. In practice, a loop compensation circuit is often used to ensure the stability of the feedback loop. [0003] Miller compensation is a general loop compensation circuit. However, Miller compensation will introduce a right-half-plane zero point, which will greatly affect the stability of the feedback loop and limit the bandwidth of the feedback loop, so some method is generally used to eliminate this zero point or change its position so that it becomes Left half plane zero. figure 1 It is a common Miller compensation feedback loop with...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/561H03F1/38H03F3/45475H03F2200/129H03F2203/45116H03F2203/45511H03F2203/45512H03F2203/45528H03F2203/45534H03F1/14H03F3/45071
Inventor 苏强奕江涛
Owner GUANGZHOU HUIZHI MICROELECTRONICS