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Multistage operational amplifier

An operational amplifier and amplifier technology, applied in differential amplifiers, improved amplifiers to expand bandwidth, DC-coupled DC amplifiers, etc., can solve the problems of difficult to achieve large bandwidth and save chip area, save chip area and reduce power consumption. , the effect of improving stability

Active Publication Date: 2014-05-07
南京中科微电子有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Therefore, it is difficult for NMC technology to achieve large bandwidth and save chip area when driving large load capacitance.

Method used

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Embodiment Construction

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0025] Such as figure 1As shown, the embodiment of the present invention provides a multi-stage operational amplifier using a multi-path single Miller capacitor frequency compensation method, including: a first-stage amplifier 401, a second-stage amplifier 402, a third-stage amplifier 403, and a Miller compensation capacitor 404 and feed-forward transconductance amplifier 405.

[0026] The first-stage amplifier 401, the second-stage amplifier 402, and the third...

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Abstract

The invention relates to the technical field of amplifiers, in particular to a multistage operational amplifier which adopts a multipath single Miller capacitance frequency compensation method. The multistage operational amplifier comprises a first-stage amplifier, a second-stage amplifier, a third-stage amplifier, a Miller compensation capacitor and a feedforward transconductance amplifier. The first-stage amplifier, the second-stage amplifier and the third-stage amplifier are in series connection in sequence, one end of the Miller compensation capacitor is connected with the output end of the first-stage amplifier, the other end of the Miller compensation capacitor is connected with the output end of the third-stage amplifier, the input end of the feedforward transconductance amplifier is connected with the input end of the first-stage amplifier, and the output end of the feedforward transconductance amplifier is connected with the output end of the second-stage amplifier. Only one Miller compensation capacitor is adopted in the multistage operational amplifier, the chip area can be greatly saved, power consumption can be reduced, due to the introduction of the feedforward transconductance amplifier, the effect caused by a first non-dominant pole is eliminated, the bandwidth of the operational amplifier is further increased, and stability is improved.

Description

technical field [0001] The invention relates to the technical field of amplifiers, in particular to a multi-stage operational amplifier using a multi-path single Miller capacitance frequency compensation method. Background technique [0002] With the continuous reduction of the feature size of the CMOS process and the continuous reduction of the chip power supply voltage, the traditional single-stage cascode amplifier can no longer meet the current requirements of low power consumption and portable electronic products for high gain, large bandwidth and low power consumption of the amplifier. Requirements, three or more single-stage amplifiers must be cascaded in order to achieve high gain requirements. At the same time, when the multi-stage operational amplifier needs to drive a large load capacitance, how to achieve the requirements of large bandwidth, low power consumption and small area, it is necessary to study the frequency compensation method of the multi-stage operati...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03F1/42
Inventor 樊晓华
Owner 南京中科微电子有限公司
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