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Conversion rate enhancing circuit applied to operational amplifier

A slew rate, op amp technology, applied in the parts of amplifying devices, amplifiers with field effect devices, and improving amplifiers to improve efficiency, etc. Domain following or responsiveness, the effect of highlighting substantive features

Active Publication Date: 2018-07-06
3PEAK INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It will inevitably have an impact on op amp performance

Method used

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  • Conversion rate enhancing circuit applied to operational amplifier
  • Conversion rate enhancing circuit applied to operational amplifier
  • Conversion rate enhancing circuit applied to operational amplifier

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Embodiment Construction

[0021] The specific implementation of the present invention will be described in further detail below in conjunction with the accompanying drawings of the embodiments, so as to make the technical solution of the present invention easier to understand and grasp, so as to define the protection scope of the present invention more clearly.

[0022] The designer of the present invention comprehensively analyzes the deficiencies in many aspects of the operational amplifier slew rate enhancement design in traditional technology and the improved architecture that has been reported, and considers and improves the defects in various architectures, combining his own experience and Creative labor, innovatively proposed a conversion efficiency enhancement circuit applied to operational amplifiers, so as to improve the ability of operational amplifiers to follow or respond to input signals.

[0023] Such as Figure 4 As shown, this is applied to the enhancement circuit of the conversion rat...

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Abstract

The invention discloses a conversion rate enhancing circuit applied to an operational amplifier. The operational amplifier comprises a folded common-emitter common-base two-stage operational amplifier. The enhancing circuit is characterized by comprising a rising edge increasing circuit and a descending edge increasing circuit, wherein positive and negative input ends of the two increasing circuits are connected with positive and negative input ends of the operational amplifier respectively; a current output end of the rising edge increasing circuit is connected to a compensation capacitor node SRn of the first-stage operational amplifier; and a current output end of the descending edge increasing circuit is connected to a compensation capacitor node SRp of a second-stage operational amplifier. Through application of the conversion rate enhancing circuit, slew current is generated when the difference value of an input signal is up to a certain threshold to control the charging and discharging current of a compensating capacitor, so that the conversion efficiency of the operational amplifier can be increased effectively. Moreover, no influence is caused on a main circuit of the operational amplifier when the difference value of the input signal is less than the threshold, so that the full input domain following or responding ability of the folded common-emitter common-base two-stage operational amplifier is ensured.

Description

technical field [0001] The invention relates to a design for improving the performance of an operational amplifier in integrated circuit design, in particular to a circuit design for enhancing conversion efficiency of an operational amplifier. Background technique [0002] Op amp is short for Operational Amplifier. In actual circuits, some kind of functional module is usually combined with a feedback network. Because it was used in analog computers in the early days to realize mathematical operations, it was named "operational amplifier", and this name has continued to this day. 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 semiconductor technology, the vast majority of operational amplifiers exist in the form of a single chip. Today there are many types of operational amplifiers, which are widely used in almost all industries. [0003] Opera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F3/16
CPCH03F1/0205H03F3/16
Inventor 李寰刘青凤
Owner 3PEAK INC
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