High-precision operational amplifier circuit integrating chopping and automatic zero setting technologies
An operational amplifier circuit and automatic zero-adjustment technology, which is applied to DC-coupled DC amplifiers, amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., can solve the problems of limited accuracy and temperature characteristics, and limited signal bandwidth, etc., to achieve Wide range of applications, reduce voltage error, improve the effect of common mode rejection ratio
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[0035] The present invention will be further illustrated and described clearly and completely in conjunction with the accompanying drawings and related knowledge. Obviously, the application of the described circuit diagram is only a part of the embodiments of the present invention, not all of them.
[0036] refer to Figure 1-Figure 2 As shown, a high-precision operational amplifier circuit integrating chopping and automatic zero adjustment proposed by the present invention can effectively eliminate input noise and reduce the DC offset voltage error of the operational amplifier by using two-stage chopping and two-stage low-pass filtering. Effectively filter out high-frequency signals, thereby improving the precision of the operational amplifier circuit and making the application range of the circuit wider.
[0037] The specific plan is:
[0038] refer to figure 1 As shown, it includes: main operational amplifier unit, input low-pass filter unit, first-stage chopping unit, DC...
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