Error amplifier

A technology for error amplifiers and inverters, applied in differential amplifiers, DC-coupled DC amplifiers, improved amplifiers to improve efficiency, etc., can solve the problems of limited ability to increase the slew rate of error amplifiers and small range of gate potential changes, etc. Achieve the effect of increasing the slew rate and quickly responding to the transient process

Inactive Publication Date: 2012-04-18
ZHEJIANG UNIV
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Problems solved by technology

[0008] However, due to the switching between the normal operating mode (the positive and negative input terminals of the core amplifier are equal) and the load jump mode, the gate potential change range of the drive tube is small (non-rail to rail), so the drive tube cannot be used in the jump mode. There is a limit to the ability to increase the slew rate of the overall error amplifier by providing enough additional current for the load of the core amplifier
The prior art has not been able to propose an error amplifier with a larger slew rate

Method used

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Embodiment Construction

[0031] The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0032] An error amplifier includes an OTA circuit and a slew rate increase circuit, and the slew rate increase circuit includes a current detection circuit and a drive circuit, such as image 3 As shown, the specific structure is:

[0033] A current detection circuit comprising a first detection circuit connected to the load of the positive input end of the OTA circuit and a second detection circuit connected to the load of the negative input end of the OTA circuit;

[0034] The drive circuit includes a first inverter group connected to the output end of the first detection circuit, a second inverter group connected to the output end of the second detection circuit, and a first inverter group connected to the output end of the first inverter group. The drive tube and the second drive tube connected to the output end of the secon...

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Abstract

The invention relates to an error amplifier, which comprises an operational transconductance amplifier (OTA) circuit and a slew rate increasing circuit, wherein the slew rate increasing circuit comprises a current detection circuit and a driving circuit; the current detection circuit comprises a first detection circuit and a second detection circuit; the first detection circuit and the second detection circuit are respectively connected with loads at a positive input end and a negative input end of the OTA circuit; the driving circuit comprises a first phase inverter group which is connected with an output end of the first detection circuit, a second phase inverter group which is connected with the output end of the second detection circuit, a first driving tube which is connected with the output end of the first phase inverter group, and a second driving tube which is connected with the output end of the second phase inverter group; and the output ends of the first driving tube and the second driving tube are respectively connected with the output end of the OTA circuit. The error amplifier has higher slew rate, and a technical effect of greatly shortening the transient process of a quick response buck system is achieved.

Description

technical field [0001] The invention relates to an error amplifier, in particular to an error amplifier with high slew rate. Background technique [0002] The error amplifier is the core part of the voltage control loop in the DC switching power supply system, and its performance directly affects the stability of the entire DC switching power supply system, especially the fast response system often has higher slew rate requirements for the error amplifier. An error amplifier in the prior art, such as figure 1 As shown, it mainly includes two parts: the core amplifier and the slew rate increasing circuit, wherein the slew rate increasing circuit includes a current detection circuit and a driving circuit. Under normal working conditions, the slew rate increase circuit does not work; when the input has a large jump, the slew rate increase circuit works, generating an additional current I dynamic flow to C L , so that the slew rate is greatly increased. [0003] A specific c...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H03F3/45H03F1/02
Inventor吴晓波杨鹏孙鹏赵梦恋殷亮秦琳柯研家
OwnerZHEJIANG UNIV