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Three-Stage Operational Amplifier Based on Damping Factor Frequency Compensation and DC Offset Cancellation

An operational amplifier and damping factor technology, applied in amplifiers, amplifier combinations, improving amplifiers to expand bandwidth, etc., can solve the problems of amplifier DC gain decline, inconspicuousness, deterioration of circuit performance, etc., to suppress DC offset and increase unity gain bandwidth. , the effect of suppressing the spike effect

Active Publication Date: 2020-10-09
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with simple Miller compensation and nested Miller compensation (NMC), some advanced compensation techniques can improve bandwidth, but it is not obvious
In addition, a general multi-stage amplifier will generate a DC offset at the input due to the offset of the input signal or the mismatch of the input differential tube, so that after the signal is amplified, a DC offset will also be generated at the output, and within a small offset It will cause the DC gain of the amplifier to drop rapidly, deteriorating the circuit performance

Method used

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  • Three-Stage Operational Amplifier Based on Damping Factor Frequency Compensation and DC Offset Cancellation
  • Three-Stage Operational Amplifier Based on Damping Factor Frequency Compensation and DC Offset Cancellation
  • Three-Stage Operational Amplifier Based on Damping Factor Frequency Compensation and DC Offset Cancellation

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Embodiment 1

[0065] See Figure 1 to Figure 4 , figure 1 A structural schematic diagram of a three-stage operational amplifier based on damping factor frequency compensation and DC offset elimination provided by the present invention; figure 2 A schematic diagram of the circuit structure of the damping factor control module provided by the present invention; image 3 A schematic diagram of the circuit structure of the third amplifier provided by the present invention; Figure 4 A schematic diagram of the circuit structure of the sub-threshold feedback operational amplifier provided by the present invention.

[0066] A three-stage operational amplifier based on damping factor frequency compensation and DC offset elimination, comprising: a first amplifier AMP1, a second amplifier AMP2, a third amplifier AMP3, a damping factor control module, a first compensation capacitor Cm1 and a fourth amplifier AMP4; in,

[0067] The output end of the first amplifier AMP1 is connected to the input e...

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Abstract

The invention relates to a three-progression operational amplifier based on damping factor frequency compensation and direct current offset cancellation, comprising a first amplifier, a second amplifier, a third amplifier, a damping factor control module, a first compensation capacitor and a fourth amplifier. The three-progression operational amplifier provided by the invention and based on the damping factor frequency compensation and direct current offset cancellation effectively inhibits peak effect from appearing near unity-gain bandwidth by adding a first compensation capacitor Cm1 and the damping factor control module, and a value of the first compensation capacitor Cm1 can be reduced and the unity-gain bandwidth of the amplifier is increased; meanwhile, a subthreshold feedback operational amplifier is added into a third amplifier AMP3 of the three-progression operational amplifier, so that direct current offset of the operational amplifier is effectively suppressed.

Description

technical field [0001] The invention belongs to the field of integrated circuit design, in particular to a three-stage operational amplifier based on damping factor frequency compensation and DC offset elimination Background technique [0002] An operational amplifier (abbreviation: operational amplifier) ​​is a circuit unit with a very high magnification. In actual circuits, some kind of functional module is usually combined with a feedback network. It is an amplifier with a special coupling circuit and feedback. Its output signal can be the result of mathematical operations such as addition, subtraction, or differentiation and integration of the input signal. Because it was used in analog computers in the early days to realize mathematical operations, it was named "operational amplifier". An operational amplifier is a circuit unit named from a functional point of view, which can be realized by a discrete device or in a semiconductor chip. With the development of semico...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/42H03F1/02H03F3/68
CPCH03F1/0211H03F1/42H03F3/68
Inventor 王静宇华羽峰朱樟明刘术彬杨银堂
Owner XIDIAN UNIV
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