Switch control circuit, delta-sigma modulation circuit, delta-sigma modulation type AD convertor

A switching control circuit, switching technology, applied in the direction of analog-to-digital converter, analog-to-digital converter, delta modulation, etc., can solve the problems of distortion rate deterioration, charge residual and other problems

Inactive Publication Date: 2010-12-01
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, since charges remain in the capacitor 112 constituting the integrator used in the ΔΣ modulation AD converter, the distortion rate deteriorates as shown in FIG. 13 .

Method used

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  • Switch control circuit, delta-sigma modulation circuit, delta-sigma modulation type AD convertor
  • Switch control circuit, delta-sigma modulation circuit, delta-sigma modulation type AD convertor
  • Switch control circuit, delta-sigma modulation circuit, delta-sigma modulation type AD convertor

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Abstract

The inventio is to suppress degradation in distortion rate of a Delta Sigma modulation AD converter by enhancing precision in integration of an integrator and precision in modulation of a Delta Sigma modulation circuit. In the switch control circuit for turning the second and third switches and the first and fourth switches of an integrator constituted of a switched capacitor having first throughfourth switches on / off complementarily, when the first and fourth switches are turned off and the second and third switches are turned on, the second switch is turned on before the fourth switch is turned on.

Description

Switch control circuit, ΔΣ modulation circuit and ΔΣ modulation AD converter technical field The invention relates to a switch control circuit, a ΔΣ modulation circuit and a ΔΣ modulation AD converter. Background technique As an AD converter used in audio equipment and the like, an AD converter using a ΔΣ modulation circuit is known (for example, Patent Document 1). The ΔΣ modulation circuit used in such an AD converter is realized by using an integrator that integrates an input analog signal and outputs it, a quantizer that converts the integrated analog signal into a digital signal and outputs it, etc. of. Also, the integrator can be configured by combining a switched capacitor and an operational amplifier. FIG. 9 shows a configuration example of an integrator using a switched capacitor and an operational amplifier. The integrator 100 includes an operational amplifier 110 , a capacitor 111 for integration, switches SW11 to SW14 , and a switched capacitor including a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/18H03M1/08H03M3/02
CPCH03M3/356H03M3/43H03M3/456
Inventor 大西章甲
Owner SANYO ELECTRIC CO LTD
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