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A compensatory method and device for DC offset voltage of amplifier

A technology of DC offset and compensation method, applied in the direction of differential amplifier, DC-coupled DC amplifier, etc., can solve the problem that the offset voltage cannot be eliminated, and achieve the effect of simple structure and small circuit scale

Inactive Publication Date: 2008-07-09
APEXONE MICROELECTRONICS
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, in these techniques, the offset voltage of the final output stage caused by the asymmetry of the components in the signal path cannot be eliminated.

Method used

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  • A compensatory method and device for DC offset voltage of amplifier
  • A compensatory method and device for DC offset voltage of amplifier
  • A compensatory method and device for DC offset voltage of amplifier

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Embodiment Construction

[0026] The specific implementation manners according to the present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] The amplifier DC offset voltage compensation device according to the first embodiment of the present invention is shown in FIG. 1 . In FIG. 1 , 100 denotes an amplifier, here a fully differential amplifier, which consists of an adder unit 101 and other modules 102 . 200 represents an offset voltage compensation block (Offset cancellation block), which is composed of a comparator 201 (comparator), a register and decoder (registor&decoder) module 202, and a current compensation block 203 (current compensation block). If the output signal of the amplifier is not a pure analog signal, a low pass filter (not shown here) can be further inserted before the comparator 201 .

[0028] Because the DC offset voltage is constant with or without the input signal. Therefore, this method compensates the input offset voltage t...

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Abstract

The invention provides a compensating method of the switching frequency of a amplifier which comprises the following steps: two output end polarities is compared in the state in which the amplifier has no signal outputting; the inputting end current of the amplifier is adjusted according to the electrode; repeated circle is carried out until achieving the requirement of stopping the cycle. The invention also provides a compensating device of the DC offset voltage of the amplifier which comprises a comparator, a register, a decoding module and a current compensation module. The invention has the advantages of simple structure, low cost, small power-consumption. Meanwhile, the invention is used both for a signal amplifier and an amplifier system, which can limit the imbalance voltage to be in small scope.

Description

technical field [0001] The invention relates to a method and a device for compensating the DC offset voltage of an amplifier. Background technique [0002] When there is no signal input to the operational amplifier, there is a certain voltage difference at the output terminal, which is called DC offset voltage (DCoffset). Due to the differences in the industrial production of integrated circuits, the existence of asymmetry and mismatch, the offset voltage inevitably exists. In an op amp with a certain gain, a small mismatch can result in a large offset voltage at the output stage. [0003] In the power amplifier chip, if the DC offset voltage is too large, on the one hand, it will cause a large static power consumption flowing through the load, which limits its application in portable products; on the other hand, the excessive offset voltage may also affect the chip’s Other properties lead to too low yield in the production process. [0004] Most of the existing technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
Inventor 万幸
Owner APEXONE MICROELECTRONICS
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