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Operational amplifier calibrating method and circuit

An operational amplifier and calibration method technology, applied in the directions of differential amplifiers, DC-coupled DC amplifiers, positive feedback circuit devices, etc., can solve the problem that the effect of offset cancellation cannot be obtained, and the final calibration effect is limited. Analog-to-digital converter quantization accuracy number control accuracy , increase the implementation complexity and other issues, to achieve the effect of improving signal transmission performance, simple structure and easy implementation

Active Publication Date: 2018-01-23
上海芯北电子科技有限公司
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Problems solved by technology

This method first requires a complete amplification, sampling, and quantization system, which increases the complexity of the implementation. At the same time, additional digital logic is required to ensure the negative feedback stability of the system, and the final calibration effect of the feedback system is limited by the model. The quantization accuracy of the digital converter and the control accuracy of the number of feedback MOS tubes cannot obtain a good offset elimination effect

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  • Operational amplifier calibrating method and circuit

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Embodiment Construction

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other accompanying drawings based on these drawings and obtain other implementations.

[0037] In order to make the drawing concise, each drawing only schematically shows the parts related to the present invention, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is marked. Herein, "a" not only means "only one", but also means "more than one".

[0038] The presen...

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Abstract

The invention provides an operational amplifier calibrating method and a circuit. The method includes the steps that an operational amplifier obtains an input first signal and an input second signal,conducts amplifying treatment to obtain a corresponding output third signal and a corresponding output fourth signal, and inputs the third signal and the fourth signal to the input end of an integrator; the integrator conducts integral treatment according to the received third signal and the received fourth signal, generates a corresponding output fifth signal and a corresponding output sixth signal, and feeds the fifth signal and the sixth signal to the operational amplifier; the operational amplifier conducts equalization treatment according to the received fifth signal and the received sixth signal and controls the third signal and the fourth signal output by the operational amplifier. The system comprises the operational amplifier and the integrator. The feedback circuit is composed ofthe integrator, so the voltage of the input differential of the operational amplifier on a transistor substrate is adjusted, and the aim of eliminating the offset voltage of the operational amplifieris realized.

Description

technical field [0001] The invention relates to the technical field of operational amplifier parameter calibration, in particular to an operational amplifier calibration method and circuit. Background technique [0002] The offset voltage of the operational amplifier means that when the two input terminals of the operational amplifier are zero, the output will have a certain value, which is equivalent to a voltage source connected in series with the inverting input terminal of the operational amplifier. The offset voltage of an op amp is due to the input-to-tube asymmetry caused by the manufacturing process and will change with temperature. [0003] In a communication receiver system, the received signal is usually small and needs to be amplified by a high gain to a level that is convenient for measurement. The op amp offset voltage will be amplified by the high-gain op amp itself, saturating its output, causing the op amp to malfunction. Therefore op amp offset voltage ca...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/34H03F1/38H03F3/45
Inventor 黄硕荀本鹏由德强文学
Owner 上海芯北电子科技有限公司
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