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operational amplifier circuit

A technology of operational amplifier circuits and operational amplifiers, applied in differential amplifiers, DC-coupled DC amplifiers, improved amplifiers to reduce nonlinear distortion, etc., can solve problems such as large nonlinearities, and achieve good linear transconductance and large voltage input dynamics range effect

Active Publication Date: 2016-08-10
CSMC TECH FAB2 CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an operational amplifier to solve the problem of large nonlinearity caused by the input transconductance of the circuit structure changing with the change of the input signal

Method used

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Embodiment approach

[0019] refer to figure 1 As shown, an implementation manner of the operational amplifier circuit of the present invention includes:

[0020] The input structure, which takes the signal and transmits the signal to the output structure;

[0021] The output structure amplifies the signal transmitted by the input structure;

[0022] Feedback network, which extracts the signal amplified by the output structure and feeds it back to the input structure;

[0023] The bias network simultaneously powers the input structure, the output structure, and the feedback network.

[0024] In the operational amplifier circuit of the above embodiment, the output signal of the output structure, that is, the output signal of the entire operational amplifier is monitored through the feedback network.

[0025] In the operational amplifier circuit, a low-voltage high-gain operational amplifier is used to clamp the potential of the input terminal, and ensure that the input voltage value of the input ...

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Abstract

An operational amplifier, characterized in that it includes: an input structure, which includes an NMOS input operational amplifier circuit and a PMOS input operational amplifier circuit; a feedback network, which includes an NMOS feedback loop connected to the NMOS input operational amplifier circuit and a PMOS input operational amplifier circuit. The PMOS feedback loop connected to the discharge circuit, the NMOS feedback loop and the PMOS feedback loop are used to make the current of the transistor depend on the input voltage and the input The size of the terminal resistance; the output structure, which amplifies the signal transmitted from the input structure; and the bias network, which supplies power to the input structure, output structure and feedback network at the same time. The invention sets a reference voltage and adopts a high-gain operational amplifier feedback loop, and the current in the transistor has unidirectionality, which can obtain good linear transconductance and simultaneously realize a large (from ground to power supply voltage) voltage input dynamic range.

Description

【Technical field】 [0001] The invention relates to the field of integrated circuit design, in particular to operational amplifier circuits. 【Background technique】 [0002] In semiconductor devices, operational amplifiers are widely used to amplify signals to be processed. An example of an operational amplifier is disclosed in Japanese Unexamined Patent Application Publication No. H6-326529 (US Patent No. 5,311,145). An operational amplifier includes an input stage amplifier and an output stage amplifier. The input stage amplifier converts the input signal according to the input structure of the output stage amplifier and amplifies the input signal. In addition, the input stage amplifier sets the no-load current that flows through the transistors that make up the output stage amplifier. The output stage amplifier amplifies the signal generated in the input stage amplifier and outputs the signal. [0003] As the size of MOS decreases, it is required to reduce the power supp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/32H03F3/45
Inventor 李超
Owner CSMC TECH FAB2 CO LTD
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