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channel conversion control method of a multi-channel SAR-ADC circuit

A channel conversion and control method technology, which is applied in the field of channel conversion control of multi-channel SAR-ADC circuits, can solve the problems of difficult multi-channel expansion of SAR-ADC circuits, conversion accuracy degradation, etc., to ensure conversion timing and reduce conversion errors , the effect of improving performance

Active Publication Date: 2019-05-14
SHENZHEN BETTERLIFE ELECTRONICS SCI & TECH
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Problems solved by technology

For a 10-bit resolution ADC, the conversion accuracy will drop sharply. If the existing conversion timing is not modified, it is difficult for the existing SAR-ADC circuit to expand multi-channel

Method used

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Embodiment Construction

[0034] The present invention will be described in more detail below in conjunction with the accompanying drawings and embodiments.

[0035] The invention discloses a channel conversion control method of a multi-channel SAR-ADC circuit, please refer to figure 2 , which includes the following steps:

[0036] Step S1, by controlling the on-off state of each switch in the SAR-ADC circuit, making the SAR-ADC circuit enter a multi-channel sampling state;

[0037] Step S2, controlling the SAR-ADC circuit to enter the sampling and holding state;

[0038] Step S3, controlling the SAR-ADC circuit to enter a global reset state;

[0039] Step S4, controlling the first channel of the SAR-ADC circuit to enter a reset state and a hold state in turn;

[0040] Step S5, controlling the first channel of the SAR-ADC circuit to enter a data quantization state;

[0041] Step S6, controlling the SAR-ADC circuit to enter a global reset state;

[0042] Step S7, controlling the next channel of th...

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Abstract

The invention discloses a channel conversion control method of a multi-channel SAR-ADC circuit. The channel conversion control method comprises the following steps that S1, the SAR-ADC circuit is controlled to enter a multi-channel sampling state; S2, controlling SAR (Synthetic Aperture Radar) The ADC circuit enters a sampling holding state; S3, controlling the SAR-ADC circuit to enter a global reset state; S4, controlling the first channel of the SAR-ADC circuit to sequentially enter a reset state and a holding state; S5, controlling the first channel of the SAR-ADC circuit to enter a data quantization state; S6, controlling the SAR-ADC circuit to enter a global reset state; S7, controlling the next channel of the SAR-ADC circuit to sequentially enter a reset state and a holding state; Step S8, controlling the next channel of the SAR-ADC circuit to enter a data quantization state; And repeating the steps S6 to S8 until the data quantification of all the channels is completed. Consistency of conversion time sequences of all channels can be guaranteed, and then conversion errors between the first channel and other channels are reduced.

Description

technical field [0001] The invention relates to a SAR-ADC circuit, in particular to a channel conversion control method for a multi-channel SAR-ADC circuit. Background technique [0002] An analog-to-digital converter (ADC) is a common circuit module in the field of analog integrated circuits, and its function is to complete the conversion of data from analog to digital. Successive approximation register ADCs (SAR-ADCs) are common architectures for medium to high resolution applications with sampling rates below 5Msps (million samples per second). The resolution of SAR-ADC is generally 8 to 16 bits, and it has the characteristics of low power consumption and small size. These characteristics make this type of ADC have a wide range of applications, such as portable / battery-powered instruments, pen input quantizers, industrial control, and data / signal acquisition. In a specific application field, such as a touch screen driver, the report rate is a very important performance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12
Inventor 高益张弛程亚宇余佳
Owner SHENZHEN BETTERLIFE ELECTRONICS SCI & TECH
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