A method for eliminating chopping ripple and an analog-to-digital conversion circuit for realizing the method
A technology of analog-to-digital conversion circuit and chopper circuit, applied in the direction of analog-to-digital converter, can solve the problems of difficulty and complexity of filter implementation, and achieve the effects of increasing complexity, saving power consumption, and eliminating ripple signals.
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[0019] Below in conjunction with accompanying drawing, through according to this design scheme embodiment, describe in detail. It should be emphasized that the following description is exemplary only, and is not intended to limit the scope of the invention and its application.
[0020] figure 2 It is the overall structure diagram of the measurement circuit adopting the chopping ripple elimination method proposed by the present invention, and the output of the chopping amplifier 10 is directly connected with the input of the second-order sigma-delta analog-to-digital converter 20. Wherein the amplifier 10 uses chopping technology to reduce DC offset and low-frequency noise; the operating frequency of the first-stage integrator module 21 of the second-order sigma-delta analog-to-digital converter 20 is twice the chopping frequency, and the second-stage integrator 22 works The frequency is the same as the chopping frequency.
[0021] The principle of first-order shaping of the...
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