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

A switch control circuit, switch technology, applied in the direction of analog-to-digital converter, analog conversion, incremental modulation, etc., can solve the problems of distortion rate degradation, charge residue, etc.

Inactive Publication Date: 2007-02-07
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 type AD converter, such as Figure 13 The degradation of the distortion rate shown

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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Embodiment Construction

[0043] == Integrator ==

[0044] figure 1 A configuration of an integrator controlled by a switch control circuit as one embodiment of the present invention is shown. The integrator 1 includes an operational amplifier 10 , an integrating capacitor 11 (first capacitor), a switched capacitor including switches SW1 to SW4 (first to fourth switches), and a capacitor 12 (second capacitor).

[0045] One electrode (first electrode) of the integrating capacitor 11 is electrically connected to the output terminal of the operational amplifier 10 , and the other electrode (second electrode) is electrically connected to the inverting input terminal of the operational amplifier 10 . Then, the intermediate voltage Vdd / 2 is applied to the non-inverting input terminal of the operational amplifier 10 .

[0046] The switch SW1 is a switch that controls the electrical connection between one electrode (third electrode) of the capacitor 12 and the inverting input terminal of the operational amp...

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PUM

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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 through fourth 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

technical field [0001] The invention relates to a switch control circuit, a ΔΣ modulation circuit and a ΔΣ modulation AD converter. Background technique [0002] 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. [0003] Also, the integrator can be configured by combining a switched capacitor and an operational amplifier. Figure 9 A configuration example of an integrator using a switched capacitor and an operational amplifier is shown. The integrator 100 includes an operational amplifier 110 , a capacitor 111 for integration, switches SW11 to SW14 , and a switched capacitor including a capacitor 112 . [0004] One electrode of the int...

Claims

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Application Information

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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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