Analog-to-digital converter and control method thereof

A technology for analog-to-digital converters and control signals, applied in the direction of analog-to-digital converters, etc., can solve problems such as the impact of linearity performance and the deterioration of the accuracy of analog-to-digital converters, and achieve the effect of improving linearity and reducing the impact of linearity

Active Publication Date: 2018-11-30
HANGZHOU SILAN MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the parasitic non-linear capacitance at the input of the comparator has a significant impact on the overall linearity performance, which leads to poor accuracy of the analog-to-digital converter

Method used

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  • Analog-to-digital converter and control method thereof
  • Analog-to-digital converter and control method thereof
  • Analog-to-digital converter and control method thereof

Examples

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Embodiment Construction

[0026] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail. Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0027] It should be understood that in the following description, a "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical or electromagnetic connections. When an element or circuit is said to be "connected to" another element or an element / circuit is ...

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Abstract

The invention discloses an analog to digital converter and a control method thereof. The analog to digital converter comprises a switched capacitor network, a comparator and a successive approximation logical circuit. The working period of the analog to digital converter comprises a sampling stage and a quantification stage; at the sampling stage, the first input end of the comparator is disconnected from the switched capacitor network; and at the quantification stage, the first input end of the comparator is connected with the switched capacitor network. Through adoption of the analog to digital converter, a parasitic capacitor at the input end of the comparator is prevented from participating into sampling of input analog voltage, so that the influence of the parasitic capacitor on the linearity of the analog to digital converter is lowered remarkably, and the linearity of a system is enhanced.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to an analog-to-digital converter suitable for micro-electro-mechanical systems and a control method thereof. Background technique [0002] Micro Electro Mechanical System (MEMS) is a technology that uses the basis of micro / nano technology to design, process, manufacture, test and control micro / nano materials. MEMS integrates mechanical components, optical system drive components, and electronic control systems into an extremely small overall unit. Therefore, in its signal processing process, chip area and power consumption issues need to be considered. Among the analog-to-digital converters (ADC) used in MEMS, the successive approximation analog-to-digital converter (Successive Approximation Register Analog to Digital Converter, SARADC) is an ideal choice. [0003] There are various circuit structures of SAR ADC, which can be roughly divided into three types: voltage scaling, c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/12
Inventor 陈灿锋郑泉智潘华兵
Owner HANGZHOU SILAN MICROELECTRONICS
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