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Correction method and correction circuit for sigma-delta modulator

a correction circuit and modulator technology, applied in the field of sigma-delta modulators, can solve the problems of adc resolution degradation or even error, and the practical ntf to deviate from the original design ntf, so as to achieve significant easing of the negative impact of pvt variations on the sdm

Active Publication Date: 2020-04-23
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The correction method and circuit effectively adjust the STF to meet design criteria, significantly reducing the negative impacts of PVT variations, ensuring the SDM operates as intended within the desired frequency band.

Problems solved by technology

However, because the SDM is susceptible to process, voltage and temperature (PVT), the ADC may suffer resolution degradation or even error.
Circuit designers usually want the SDMs to operate in accordance with the originally designed signal transfer function (STF), but PVT variations often cause the practical NTF to deviate from the originally designed NTF.

Method used

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

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Embodiment Construction

[0017]The following description is written by referring to terms of this technical field. If any term is defined in this specification, such term should be explained accordingly. In addition, the connection between objects or events in the below-described embodiments can be direct or indirect provided that these embodiments are practicable under such connection. Said “indirect” means that an intermediate object or a physical space exists between the objects, or an intermediate event or a time interval exists between the events.

[0018]The disclosure herein includes correction methods and correction circuits for correcting sigma-delta modulators (SDMs). On account of that some or all elements of the correction circuits could be known, the detail of such elements is omitted provided that such detail has little to do with the features of this disclosure and this omission nowhere dissatisfies the specification and enablement requirements. Some or all of the processes of the correction met...

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Abstract

A correction method and a correction circuit for a sigma-delta modulator (SDM) are provided. The SDM includes a loop filter, a quantizer, and a digital-to-analog converter (DAC). The correction method includes: generating a test signal for a frequency to be tested; inputting the test signal to a feedforward circuit that includes at least one adjustable impedance circuit, the test signal being inputted to the SDM through the impedance circuit; calculating an output signal of the SDM to obtain a value of a signal transfer function (STF) of the SDM at the frequency to be tested; and adjusting the impedance circuit.

Description

BACKGROUND1. Field of the Disclosure[0001]The present disclosure generally relates to sigma-delta modulators (SDMs), and, more particularly, to a correction method and a correction circuit for SDMs.2. Description of Related Art[0002]A sigma-delta modulator (SDM) can be used as an analog-to-digital converter (ADC). However, because the SDM is susceptible to process, voltage and temperature (PVT), the ADC may suffer resolution degradation or even error. Circuit designers usually want the SDMs to operate in accordance with the originally designed signal transfer function (STF), but PVT variations often cause the practical NTF to deviate from the originally designed NTF. Therefore, a correction method and a correction circuit are needed to correct the SDM to ensure the efficiency and correctness of the SDM.SUMMARY[0003]In view of the issues of the prior art, an object of this disclosure is to provide a correction method and a correction circuit for sigma-delta modulators (SDMs) to make ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H03M3/00H03L7/08
CPCH03M3/352H03M3/32H03M3/322H03L7/08H03M3/50H03L7/1976H03M3/378H03M3/386H03M3/438H03M3/456
Inventor CHEN, CHIH-LUNGLAI, JIE-FANCHEN, YU-CHANGHUANG, SHIH-HSIUNG
Owner REALTEK SEMICON CORP