High common mode rejection ratio preamplifier

A preamplifier and high common-mode rejection technology, which is applied in the field of control, can solve the problems of expensive differential preamplifier integrated chips, poor chip performance, and difficulty in achieving it, and achieve products that are easy to manufacture, easy to sell, and high common mode Mode suppression ratio performance, the effect of simple overall structure

Inactive Publication Date: 2003-04-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The differential preamplifier integrated chip with excellent performance is very expensive, and the performance of the low-priced chip is very poor, so it is difficult to meet the needs of both performance and low cost.

Method used

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  • High common mode rejection ratio preamplifier
  • High common mode rejection ratio preamplifier
  • High common mode rejection ratio preamplifier

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Embodiment Construction

[0011] Below in conjunction with accompanying drawing, the implementation of the present invention is described in detail as follows:

[0012] exist figure 1 Medium and high common-mode rejection ratio preamplifiers, whose parallel dual-op-amp instrumentation amplifier consists of an op-amp A 1 , Operational amplifier A 2 , resistance R 1 , R 2 , R 3 Composed of two sets of resistance-capacitance coupling circuits respectively composed of capacitance C 1 , resistance R 6 and capacitance C 2 , resistance 7, and the post amplifier is composed of integrated instrument amplifier A 4 , resistance R G Composed, the common mode signal sampling circuit is composed of resistor R 4 , R 5 , R W constitute.

[0013] where the operational amplifier A 1 , Operational amplifier A 2 The output terminals are respectively connected with the capacitor C 1 , capacitance C 2 with integrated instrumentation amplifier A 4 input connection. Resistance R 1 respectively with the op a...

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Abstract

A preamplifier with high common-mode suppression ratio includes connect output end of parallel dual mode instrumentation amplifier with coupling circuit of two groups of resistance-capacitance separately, the circuits of two groups of resistance-capacitance connected with the input end of integrated instrumentation amplifier in next stage amplifier separately, the common-mode signal sampling circuit connected with outupt end of parallel dual mode instrumentation amplifier separately and the coupling circuit of two groups of resistance-capacitance also connected with common-mode signal sampling circuit so that it is made to have the advatnages as follows: the common-mode suppression ratio being infinite, the output being output signal of dual end differential action and no relationship to the matching of its peripheral resistance.

Description

technical field [0001] The invention belongs to the category of control, and in particular relates to electronic measurement and control technology. Background technique [0002] At present, known instrumentation and measurement and control systems usually operate in a strong interference environment, especially in the presence of strong common-mode interference, so a high common-mode rejection ratio is the most important indicator of a differential preamplifier. Most of the current differential preamplifiers are composed of instrument amplifiers in the form of three operational amplifiers or dual operational amplifiers, or special differential preamplifier integrated chips. When the differential preamplifier circuit is composed of an instrument amplifier in the form of three op amps or two op amps, the circuit is complex, high in cost, poor in manufacturability, and low in performance. The differential preamplifier integrated chip with excellen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
Inventor 李刚林凌
Owner TIANJIN UNIV
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