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Linear error amplifier with temperature compensation

A temperature compensation and linear error technology, applied in the field of linear transconductance error amplifier, can solve the problem of not meeting the performance requirements of the error amplifier, and achieve the effects of widening the input dynamic range, improving the power supply rejection ratio, and improving temperature stability

Inactive Publication Date: 2017-05-31
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Description
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  • Application Information

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Problems solved by technology

This value is far from meeting the performance requirements of the error amplifier

Method used

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  • Linear error amplifier with temperature compensation
  • Linear error amplifier with temperature compensation
  • Linear error amplifier with temperature compensation

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Embodiment Construction

[0015] The unbalanced differential pair has two typical circuit structures in the bipolar transistor circuit: a multi-compensation bias structure and a multi-emitter area structure. The present invention is designed based on a multi-emitter area structure. The unbalanced differential pair is as image 3 shown. The output current of the differential pair after moving is

[0016]

[0017] Therefore, in order to make the amplifier linearly amplify, according to the previous assumption, only need

[0018]

[0019] Because the present invention is designed based on the unbalanced differential pair of multi-width-to-length ratio structure, so image 3 The output current of the shown structure can be expressed as

[0020]

[0021] therefore, For two-stage unbalanced differential pairs,

[0022]

[0023] According to formula (5), if the linear range is to be ±50mV, then ΔV≥30mV, but actually 60mV can get better results. In the present invention, it is designed as A ...

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Abstract

The invention belongs to the technical field of analog integrated circuitry and particularly provides a linear error amplifier with temperature compensation, comprising a PTAT (proportional to absolute temperature) current source, a common collector level shift circuit, a transconductance amplifier composed of an imbalance differential pair, and a frequency compensation network composed of C1, C2 and R1. The common collector level shift circuit raises low voltage to a higher one which is input to a secondary transconductance amplifier; the secondary transconductance amplifier is composed of an imbalance differential pair according to poly-hyperbolic tangent principle, with effective input voltage range widened and linearity improved; the PTAT current source provides tail current for the differential pair to compensate amplifier transconductance instability due to temperature changes; the frequency compensating network generates a suitable zero polar point so that the phase margin of the transconductance amplifiers reaches 60 degrees. The linear error amplifier disclosed herein has a wide dynamic voltage input range and low temperature sensitivity, and is suitable particularly for error amplifiers of DC-DC converters.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, in particular to a linear transconductance error amplifier with temperature compensation. Background technique [0002] The error amplifier is a very important integrated circuit module in the analog integrated circuit, which is mainly used for error detection and amplification of analog signals. For example, in a DC-DC converter, the error amplifier detects the output feedback sampling voltage, and uses a fixed voltage as a reference to amplify the feedback voltage difference, and the output signal participates in the subsequent circuit to adjust the final output of the converter. Therefore, the error amplifier plays a vital role in the overall regulation loop of the DC-DC converter. Its impact on system accuracy, speed, and stability requires the characteristics of high gain, high common-mode rejection ratio, large input dynamic range, and high and stable transconductance va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/30H03F3/45
CPCH03F1/30H03F1/301H03F1/302H03F3/45H03F3/45488H03F3/45636H03F3/45932
Inventor 李威王影
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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