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Successive approximation type analog-to-digital converter and switching method thereof

An analog-to-digital converter, successive approximation type technology, applied in the direction of analog-to-digital conversion, code conversion, energy saving methods, etc. The effect of area reduction and switching power consumption reduction

Active Publication Date: 2017-07-21
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Capacitor arrays occupy a large area and consume a lot of power in successive approximation ADCs

Method used

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  • Successive approximation type analog-to-digital converter and switching method thereof
  • Successive approximation type analog-to-digital converter and switching method thereof
  • Successive approximation type analog-to-digital converter and switching method thereof

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Embodiment Construction

[0025] The successive approximation analog-to-digital converter of the present invention includes a positive input voltage, a negative input voltage, a comparator, and a sampling switch S P , Sampling switch S N , a capacitor array and a successive approximation register control logic circuit, the comparator output terminal is connected to the successive approximation register control logic circuit, and the positive input terminal of the comparator passes through the sampling switch S P connected to the positive input voltage, the negative input of the comparator is passed through the sampling switch S N connected to the negative input voltage;

[0026] The capacitor array includes a forward capacitor array and a negative capacitor array, the forward capacitor array includes two first capacitors, each of the first capacitor upper plates is connected to the positive input terminal of the comparator, each of the The lower plate of the first capacitor is selected to connect to ...

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Abstract

The invention provides a successive approximation analog-to-digital converter comprising a positive input voltage, a negative input voltage, a comparator, a sampling switch SP, a sampling switch SN, a capacitor array and a successive approximation register control logic circuit, wherein an output end of the comparator is connected to the successive approximation register control logic circuit, a positive input end of the comparator is connected to the positive input voltage through the sampling switch SP, and a negative input end of the comparator is connected to the negative input voltage through the sampling switch SN. The invention further provides a switching method of the successive approximation analog-to-digital converter. The energy consumption of turning on and turning off the capacitor array is reduced, the area of the capacitor array is reduced, the chip manufacturing cost is reduced, and the economic benefit is improved.

Description

technical field [0001] The invention relates to a successive approximation analog-to-digital converter and a switching method thereof. Background technique [0002] The successive approximation analog-to-digital converter has simple structure, low power consumption and small area, and is widely used in wireless sensors, implanted medical devices and other fields that require high power consumption and area. Capacitor arrays occupy a large area and consume a lot of power in successive approximation analog-to-digital converters. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a successive approximation analog-to-digital converter and its switching method, which can reduce the energy consumption of capacitor array switching, reduce the area of ​​the capacitor array, reduce the cost of chip manufacturing, and improve economic benefits. [0004] One of the present invention is realized like this: a kind of successive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/00H03M1/46
CPCH03M1/002H03M1/466Y02D10/00
Inventor 王浩谢文明陈知新蔡思静郑少烽
Owner FUJIAN UNIV OF TECH