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A Charge Redistribution Digital-to-Analog Converter and a Successive Approximation Analog-to-Digital Converter

A technology of charge redistribution and digital-to-analog conversion, used in digital-to-analog converters, analog-to-digital conversion, instruments, etc., and can solve problems such as common-mode voltage fluctuations

Active Publication Date: 2020-10-23
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of common-mode voltage variation in the existing charge redistribution digital-to-analog converter, an embodiment of the present invention provides a charge redistribution digital-to-analog converter and a successive approximation analog-to-digital converter

Method used

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  • A Charge Redistribution Digital-to-Analog Converter and a Successive Approximation Analog-to-Digital Converter
  • A Charge Redistribution Digital-to-Analog Converter and a Successive Approximation Analog-to-Digital Converter

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Embodiment 1

[0031] An embodiment of the present invention provides a charge redistribution digital-to-analog converter, which is suitable for constructing a successive approximation analog-to-digital converter, see figure 1 , the charge redistribution digital-to-analog converter may include: a multi-digit digital-to-analog conversion circuit 10, and each digital-to-analog conversion circuit 10 may include: a first monotonic switch for controlling the monotonous decrease or increase of the output voltage of the digital-to-analog conversion circuit 10 The circuit 100 and the second monotonous switching circuit 200 used to control the monotonous increase or decrease of the output voltage of the digital-to-analog conversion circuit 10, each time the digital-to-analog converter completes conversion, the magnitude of the monotonous decrease of the first monotonous switching circuit 100 is the same as that of the first monotonous switching circuit 100. The monotonically increasing amplitudes of t...

Embodiment 2

[0041] An embodiment of the present invention provides a successive approximation analog-to-digital converter, using the charge redistribution digital-to-analog converter described in Embodiment 1, see figure 2 , the successive approximation analog-to-digital converter may include: a charge redistribution digital-to-analog converter, a comparator 20 , and a control circuit 30 , and the output terminal of the comparator 20 is connected to the control circuit 30 .

[0042] The charge redistribution digital-to-analog converter may include: a multi-digit digital-to-analog conversion circuit 10, and each digital-to-analog conversion circuit 10 may include: a first monotonic switching circuit for controlling the monotonous decrease or increase of the output voltage of the digital-to-analog conversion circuit 10 100 and the second monotonous switching circuit 200 used to control the monotonous increase or decrease of the output voltage of the digital-to-analog conversion circuit 10, ...

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Abstract

The invention discloses an electric charge frequency redivision digital-analog converter and a successive approximation type converter. The digital-analog converter comprises a multiple digital-analog conversion circuits, and each digital-analog conversion circuit comprises a first monotonic switching circuit and a second monotonic switching circuit; after the digital-analog converter accomplishes the switching every time, the reduced amplitude of the monotony of the first monotonic switching circuit is same as the increased amplitude of the monotony of the second monotonic switching circuit; or the increased amplitude of the monotony of the first monotonic switching circuit is same as the reduced amplitude of the monotony of the second monotonic switching circuit; therefore, the increased amplitude and the reduced amplitude of the first monotonic switching circuit and the second monotonic switching circuit are canceled out to realize the aim of stabilizing the common-mode voltage; and meanwhile, the effect of always maintaining the stabilization of the common-mode voltage output by the digital-analog converter can be achieved by only changing the handover way of an original switch in the premise of not adding a circuit module; the circuit lost is low, and the reliability is high.

Description

technical field [0001] The invention relates to the technical field of digital-to-analog converters, in particular to a charge redistribution digital-to-analog converter with a common-mode voltage stabilization function. Background technique [0002] Common structures of charge redistribution DACs are Vcm-Based Switching and monotonic switching DACs. The output voltage of the former is symmetrical based on the common-mode voltage, so there is no dynamic DC offset of the comparator; however, this structure requires an additional common-mode reference voltage compared to the latter, which itself requires a large DC power consumption, and the common-mode level is at VDD / 2, which makes the on-resistance of the switch larger, which is not conducive to high-speed applications, and the control switch of the digital-to-analog converter is more complicated. The latter has the advantage of simple circuit, but since the output of the digital-to-analog converter changes monotonously t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/46H03M1/66
CPCH03M1/466H03M1/66
Inventor 葛彬杰冯晓星李琰俞航
Owner SHENZHEN UNIV