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An operational amplifier which can elastically switch the candidate capacitors

An operational amplifier and capacitor technology, applied in the field of operational amplifiers that can flexibly switch candidate capacitors, can solve the problems of shortening the charging or discharging time of the feedback capacitor of the operational amplifier, and it is difficult to effectively improve the response speed of the operational amplifier. Effect

Active Publication Date: 2019-05-07
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the charging or discharging time of the feedback capacitor inside the operational amplifier cannot be substantially shortened, it is difficult to effectively improve the response speed of the operational amplifier

Method used

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  • An operational amplifier which can elastically switch the candidate capacitors
  • An operational amplifier which can elastically switch the candidate capacitors
  • An operational amplifier which can elastically switch the candidate capacitors

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Embodiment Construction

[0045] Embodiments of the present invention will be described below in conjunction with related drawings. In the drawings, the same reference numerals represent the same or similar elements or method flows.

[0046] figure 1 It is a simplified functional block diagram of the operational amplifier 100 according to an embodiment of the present invention. The operational amplifier 100 includes a first gain stage 110 , a second gain stage 120 , a plurality of candidate capacitors, a plurality of switches, and a capacitor selection circuit 170 .

[0047] For the sake of illustration, figure 1 Candidate capacitors 131, 133, and 135 (hereinafter respectively referred to as first to third candidate capacitors), candidate capacitors 151, 153, and 155 (hereinafter respectively referred to as fourth to sixth candidate capacitors) are shown in Switches 141 - 146 (hereinafter referred to as first to sixth switches, respectively), and switches 161 - 166 (hereinafter referred to as sevent...

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Abstract

The invention provides an operational amplifier, comprising a first gain stage arranged to generate a second signal according to a first signal transmitted by a pre-stage circuit; The second gain stage arranged to generate an output signal according to the second signal; A plurality of candidate capacitors; And the capacitance selection circuit configured to switch the coupling modes of the plurality of candidate capacitors according to the magnitude of the input signal of the pre-stage circuit, so that only one part of candidate capacitors of the plurality of candidate capacitors can be coupled to the second gain stage in the same time.

Description

technical field [0001] The invention relates to an operational amplifier, in particular to an operational amplifier capable of elastically switching candidate capacitors. Background technique [0002] Operational amplifiers are widely used in many circuits, but the overall performance or operating speed of these circuits is often limited by the response speed of the operational amplifier. It is well known that the amount of time it takes for the feedback capacitor inside an op amp to charge or discharge has a large impact on the op amp's response speed. If the charging or discharging time of the feedback capacitor inside the operational amplifier cannot be substantially shortened, it is difficult to effectively improve the response speed of the operational amplifier. Contents of the invention [0003] In view of this, how to shorten the charging or discharging time required for the feedback capacitor inside the operational amplifier to effectively improve the response spe...

Claims

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Application Information

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IPC IPC(8): H03M1/10H03M1/12
Inventor 赖杰帆陈志龙黄诗雄吴健铭
Owner REALTEK SEMICON CORP
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