Current Feedback Operational Amplifier Circuit

An operational amplifier, current feedback technology, applied in negative feedback circuit layout, DC coupled DC amplifier, differential amplifier and other directions, can solve the problems of low gain accuracy and large static error of current feedback operational amplifier, achieve high conversion rate, overcome the The static error is too large and the effect of reducing the offset voltage

Active Publication Date: 2014-10-08
FENGHUO COMM SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of the PNP and NPN transistors in the bipolar complementary process, it is difficult to be ideally symmetrical. For example, due to the difference in the VBE of the input stage PNP and NPN transistors, the offset voltage VOS, the bias current of the inverting input terminal and the bias current of the non-inverting input terminal Cause offset voltage, etc., resulting in large static error and low gain accuracy of the current feedback operational amplifier

Method used

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  • Current Feedback Operational Amplifier Circuit

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Embodiment Construction

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] see figure 1 As shown, the current feedback operational amplifier circuit provided by the embodiment of the present invention specifically includes a power supply, a bias current supply unit 1, a first common base-common emitter current mirror, a second common base-common emitter current mirror, and a static bias circuit , sequentially connected input buffer stage and voltage conversion stage 2, drive output unit 3, the drive output unit 3 includes a bias voltage circuit and an output buffer stage, and the bias current supply unit 1 passes through the first common base-common emitter current mirror respectively , The second common base-common emitter current mirror is connected to the input buffer stage for providing bias current; the static bias circuit is respectively connected to the inverting input terminal of the input buffer stage...

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Abstract

The invention discloses a current feedback operational amplifier circuit, comprising a power supply, a bias current supply unit, a first common base-common emitter current mirror, a second common base-common emitter current mirror, a static bias circuit, an input buffer stage, The voltage conversion stage, the drive output unit, the drive output unit includes a bias voltage circuit and an output buffer stage, and the bias current supply unit passes through the first common base-common emitter current mirror, the second common base-common emitter current mirror and the input buffer respectively The stage is connected to provide bias current; the static bias circuit is connected to the inverting input terminal of the input buffer stage and the voltage conversion stage respectively, and is used to stabilize the static operating point of the inverting input terminal. The invention has the advantages of low offset voltage, strong load capacity and high conversion rate, and improves the precision and linearity of the entire operational amplifier.

Description

technical field [0001] The invention relates to a current feedback amplifier applied to a high-power drive integrated circuit, in particular to a current feedback operational amplifier circuit. Background technique [0002] The current feedback operational amplifier circuit does not have the limitation that the gain-bandwidth product is constant, so it can linearly process larger amplitude signals and respond to higher frequency signals. However, due to the characteristics of the PNP and NPN transistors in the bipolar complementary process, it is difficult to be ideally symmetrical. For example, due to the difference in the VBE of the input stage PNP and NPN transistors, the offset voltage VOS, the bias current of the inverting input terminal and the bias current of the non-inverting input terminal Cause offset voltage, etc., resulting in large static error and low gain accuracy of the current feedback operational amplifier. Contents of the invention [0003] The purpose ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H03F1/34H03F3/45
Inventor周华蒋湘任娟王丽芳吴振东
OwnerFENGHUO COMM SCI & TECH CO LTD