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Correction method and correction circuit of delta-sigma modulator

A trigonometric integral and correction method technology, applied in electrical components, analog conversion, code conversion, etc., can solve problems such as errors, signal transfer function deviation, analog-to-digital conversion resolution degradation, etc.

Active Publication Date: 2020-05-05
REALTEK SEMICON CORP
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]The delta-sigma modulator can be used as an analog-to-digital converter (ADC). One of its disadvantages is that it is easily affected by the process, The influence of voltage and temperature leads to poor resolution or even errors in analog-to-digital conversion
Circuit designers usually hope that the delta-sigma modulator can operate according to the originally designed signal transfer function (STF), but the process, voltage and temperature will cause the actual signal transfer function to deviate from the originally designed signal transfer function

Method used

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  • Correction method and correction circuit of delta-sigma modulator
  • Correction method and correction circuit of delta-sigma modulator
  • Correction method and correction circuit of delta-sigma modulator

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Embodiment Construction

[0037] The technical terms in the following explanations refer to the customary terms in this technical field. If some terms are explained or defined in this specification, the explanations or definitions of these terms shall prevail.

[0038] The disclosed content of the present invention includes a calibration method and a calibration circuit of a delta-sigma modulator, which are used to reduce or avoid the influence of the delta-sigma modulator from process, voltage and temperature. Since some elements included in the correction circuit of the delta-sigma modulator of the present invention may be known elements individually, so without affecting the full disclosure and practicability of the device embodiment, the following description is based on known elements. Details of elements will be omitted. In addition, part or all of the process of the correction method of the delta-sigma modulator of the present invention may be in the form of software and / or firmware, and may be ...

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Abstract

The invention discloses a correction method and a correction circuit of a delta-sigma modulator. The delta-sigma modulator comprises a loop filter, a quantizer and a digital-to-analog converter. The correction method comprises the steps of generating a test signal for a to-be-tested frequency; inputting the test signal to a feed-forward circuit, the feed-forward circuit comprising at least one impedance circuit, the impedance circuit being adjustable, the test signal being input to the delta-sigma modulator via the impedance circuit; calculating an output signal of the delta-sigma modulator toobtain a value of a signal transfer function of the delta-sigma modulator at the frequency to be measured; and adjusting the impedance circuit.

Description

technical field [0001] The present invention relates to a delta-sigma modulator (sigma-delta modulator, SDM), in particular to a correction method and a correction circuit of the delta-sigma modulator. Background technique [0002] The delta-sigma modulator can be used as an analog-to-digital converter (ADC). One of its disadvantages is that it is easily affected by the process, voltage and temperature, resulting in analog-to-digital conversion. poor resolution or even errors. Circuit designers usually hope that the delta-sigma modulator can operate according to the originally designed signal transfer function (STF), but the process, voltage and temperature will cause the actual signal transfer function to deviate from the originally designed signal transfer function. Therefore, a calibration method and a calibration circuit are needed to calibrate the delta-sigma modulator to ensure the performance and correctness of the delta-sigma modulator. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M3/00
CPCH03M3/38
Inventor 陈志龙赖杰帆陈昱璋黄诗雄
Owner REALTEK SEMICON CORP
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