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
CN101217263AInactive Publication Date: 2008-07-09APEXONE MICROELECTRONICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
APEXONE MICROELECTRONICS
Publication Date
2008-07-09
Estimated Expiration
Not applicable · inactive patent

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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.
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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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