A Reference Source with Automatic Op Amp Offset Cancellation

A reference source and operational amplifier technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems affecting accuracy and temperature characteristics, and achieve the effect of improving performance

Active Publication Date: 2016-04-20
CHENGDU GANIDE TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0016] The purpose of the present invention is to provide a reference source with the function of automatically eliminating the offset of the operational amplifier to solve the problem that the reference voltage output by the reference voltage source affects its accuracy and temperature characteristics due to the existence of the input offset voltage of the operational amplifier

Method used

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  • A Reference Source with Automatic Op Amp Offset Cancellation
  • A Reference Source with Automatic Op Amp Offset Cancellation
  • A Reference Source with Automatic Op Amp Offset Cancellation

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Embodiment Construction

[0029] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] In the following description, references to "one embodiment," "an embodiment," "an example," "example," etc. indicate that such described embodiment or example may include a particular feature, structure, characteristic, property, element, or limitations, but not every embodiment or example necessarily includes the specific feature, structure, characteristic, property, element or limitation. Additionally, repeated use of the phrase "according to one embodiment of the present application" does not necessarily refer to the same embodiment, although it may.

[0031] For simplicity, some technical features known to those skilled in the art are omitted from the following description.

[0032] According to one embodiment of the pres...

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Abstract

The invention discloses a reference source with an automatic operational amplifier offset voltage eliminating function. The reference source comprises a reference voltage generating circuit, an operational amplifier circuit, an offset voltage eliminating circuit, a starting circuit and a clock generating and control circuit. The reference source controls the operational amplifier circuit and the offset voltage eliminating circuit through clock signals, output of the operational amplifier circuit is fed back to input of the operational amplifier circuit so as to eliminate input offset voltage of an operational amplifier itself, the accuracy and the temperature characteristic of reference voltage output by the reference source cannot be affected by existence of the input offset voltage of the operational amplifier, and the performance of the reference source is improved.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a reference source with the function of automatically eliminating the offset of an operational amplifier. Background technique [0002] Reference sources are widely used in the design of hybrid integrated circuits. As the circuit system becomes more and more complex, its performance requirements are higher. On-chip integrated high-performance reference sources are indispensable. [0003] The working principle of the traditional bandgap reference voltage source is to use the forward voltage V of the PN junction diode with a negative temperature coefficient BE and a thermal voltage V with a positive temperature coefficient T mutual compensation; figure 1 It is a circuit schematic diagram of a traditional bandgap reference voltage source, which mainly includes two bipolar transistors Q1 and Q2, output voltage adjustment resistors R1, R2 and R3, and an operational amplifier OP; w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 伍莲洪郑薇周唯晔刘浩梁艳苏黎荆吉利尹浩任军李奎利童伟胡柳林
Owner CHENGDU GANIDE TECH
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