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Method for eliminating chopping waves and ripple waves and analogue-digital conversion circuit for realizing 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, reducing ripple amplitude and low power consumption

Inactive Publication Date: 2013-04-03
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Filters that meet this requirement are difficult and complex to implement

Method used

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  • Method for eliminating chopping waves and ripple waves and analogue-digital conversion circuit for realizing method
  • Method for eliminating chopping waves and ripple waves and analogue-digital conversion circuit for realizing method
  • Method for eliminating chopping waves and ripple waves and analogue-digital conversion circuit for realizing method

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Embodiment Construction

[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 only exemplary and 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 sig...

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Abstract

The invention provides a method for eliminating chopping waves and ripple waves and an analogue-digital conversion circuit for realizing the method. The method comprises the following steps of: carrying out two times of sampling on signals in a chopping wave period at an interval which is one half of time of the chopping wave period; and carrying out integration and summation on two times of sampling values so as to keep useful signals and eliminate residual ripple wave signals in the chopping waves. The signal amplification and analogue-digital conversion circuit comprises a chopping wave amplifier and a sigma-delta analogue-digital converter which is cascaded behind the chopping wave amplifier. A switching structure which is embedded into the sigma-delta analogue-digital converter is adopted and an analogue addition function of a first-grade integrator in the analogue-digital converter can be used for carrying out first-order reshaping (voltage summation) on the residual ripple waves of output signals of the chopping wave amplifier, so that the ripple wave amplitude is reduced and influences on the conversion precision of the analogue-digital converter is weakened. The circuit does not need an analogue low-pass filter between the chopping wave amplifier and the analogue-digital converter, so that the power consumption and the area are saved and the design of the circuit is simplified.

Description

technical field [0001] The invention belongs to the field of circuits, especially the design of integrated circuits, and in particular relates to a method for eliminating chopping ripple and an analog-to-digital conversion circuit for realizing the method. Background technique [0002] High-performance instrumentation amplifiers are widely used in various microvolt-level signal measurement circuits. To accurately amplify weak signals, an instrumentation amplifier needs to have microvolt-level offset, high common-mode rejection ratio, high power-supply rejection ratio, high input impedance, and good noise performance. [0003] Today, most analog circuits are implemented using CMOS technology. Compared with bipolar transistors, MOS transistors have low transconductance efficiency, poor matching, and poor noise performance, which limits the performance of instrumentation amplifiers. The noise performance of CMOS amplifiers can be improved by using chopping techniques and auto-...

Claims

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Application Information

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IPC IPC(8): H03M1/12
Inventor 姜珲王自强张春麦宋平陈虹姜汉钧王志华
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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