Control circuit based on operational amplifiers

A technology of operational amplifiers and control circuits, applied in the direction of power amplifiers, etc., can solve problems such as sink (sink current) and achieve the effect of solving undershoot or overshoot and improving response speed

Active Publication Date: 2020-07-24
3PEAK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The LDO structure only has Source (current pulling) capability, not Sink (current sinking) capability

Method used

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  • Control circuit based on operational amplifiers
  • Control circuit based on operational amplifiers
  • Control circuit based on operational amplifiers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] ginseng Figure 5 As shown, the control circuit in this embodiment includes:

[0056] The main control unit includes a first operational amplifier EA and a first MOS tube, and the first operational amplifier EA includes a receiving input signal V IN The first input end of the receiving signal feedback signal V FB The second input terminal and the first output terminal connected to the first MOS tube, the first MOS tube and the output voltage V OUT The second output terminal is connected;

[0057] Feedback unit for output voltage signal V OUT Generates a feedback signal V FB ;

[0058] load (not shown), and the output voltage signal V OUT connected;

[0059] The auxiliary control unit includes a second operational amplifier AMP and a plurality of second MOS tubes, and the second operational amplifier AMP includes a receiving input signal V IN The third input terminal of the receiving signal feedback signal V FB The fourth input end and the third output end conne...

Embodiment 2

[0071] ginseng Figure 7 As shown, the control circuit in this embodiment includes:

[0072] The main control unit includes a first operational amplifier EA and a first MOS tube, and the first operational amplifier EA includes a receiving input signal V IN The first input end of the receiving signal feedback signal V FB The second input terminal and the first output terminal connected to the first MOS tube, the first MOS tube and the output voltage V OUT The second output terminal is connected;

[0073] Feedback unit for output voltage signal V OUT Generates a feedback signal V FB ;

[0074] load (not shown), and the output voltage signal V OUT connected;

[0075] The auxiliary control unit includes a second operational amplifier AMP and a plurality of second MOS tubes, and the second operational amplifier AMP includes a receiving input signal V IN The third input terminal of the receiving signal feedback signal V FB The fourth input end and the third output end conne...

Embodiment 3

[0084] ginseng Figure 8 As shown, the control circuit in this embodiment includes:

[0085] The main control unit includes a first operational amplifier EA and a first MOS tube, and the first operational amplifier EA includes a receiving input signal V IN The first input end of the receiving signal feedback signal V FB The second input terminal and the first output terminal connected to the first MOS tube, the first MOS tube and the output voltage V OUT The second output terminal is connected;

[0086] Feedback unit for output voltage signal V OUT Generates a feedback signal V FB ;

[0087] load (not shown), and the output voltage signal V OUT connected;

[0088] The auxiliary control unit includes a second operational amplifier AMP and a plurality of second MOS tubes, and the second operational amplifier AMP includes a receiving input signal V IN The third input terminal of the receiving signal feedback signal V FB The fourth input end and the third output end conne...

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PUM

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Abstract

The invention discloses a control circuit based on operational amplifiers, and the circuit comprises a main control unit which comprises a plurality of first operational amplifiers and a plurality offirst MOS tubes, wherein the first operational amplifiers are used for driving the first MOS tubes according to an input signal VIN and a feedback signal VFB, so as to generate an output voltage signal VOUT; a feedback unit; a load; and an auxiliary control unit which comprises a plurality of second operational amplifiers and a plurality of second MOS tubes, wherein the second operational amplifiers and the second MOS tubes are used for driving the first MOS tubes according to the input signals VIN and the feedback signals VFB to generate output voltage signals VOUT; the offset voltage Voffset2 of the second operational amplifiers is greater than the offset voltage Voffset 1 of the first operational amplifiers. Through the combination of the main control unit and the auxiliary control unit, only the main control path works when the load is stable, and the auxiliary control path works prior to the main control path when the load suddenly changes, so that the response speed of the control circuit is greatly improved, and the undershoot or overshoot phenomenon of the output voltage is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a control circuit based on an operational amplifier. Background technique [0002] The control circuit based on LDO structure (Low Dropout regulator, low dropout linear regulator) or Class AB structure can provide stable output voltage signal V for noise-sensitive circuits such as analog circuits and radio frequency circuits. OUT , but when the load Iload changes suddenly, the limited loop bandwidth has no time to respond, and the output voltage signal V OUT There will be undershoot or overshoot. If the undershoot or overshoot is too large, it may cause abnormality in the subsequent circuit. Therefore, it is necessary to avoid undershoot or overshoot in the actual control circuit. [0003] ginseng figure 1 Shown is the control circuit based on LDO structure in the prior art, which includes operational amplifier EA, MOS transistor P1', voltage dividing re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/20
CPCH03F3/20
Inventor 石传波
Owner 3PEAK INC
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