Capacitive SAR ADC

A capacitive, sampling capacitor technology, applied in electrical components, electrical signal transmission systems, signal transmission systems, etc., can solve problems such as signal leakage, and achieve the effect of avoiding non-conduction

Active Publication Date: 2020-10-09
SEMICON MFG INT (SHANGHAI) CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the traditional SAR ADC may have a leakage current that causes signal leakage

Method used

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Embodiment Construction

[0026] In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without one or more of these details. In other examples, some technical features known in the art are not described in order to avoid confusion with the present invention.

[0027] It should be understood that the invention can be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Like reference numerals refer to like elements throughout.

[0028] It will be understood that when an element or layer is referred t...

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Abstract

The invention relates to a capacitance type SAR ADC which comprises a comparator, the positive end and the negative end of the comparator are respectively connected with a sampling capacitor network and a common-mode adjustment capacitor network; in the sampling phase, upper polar plates of the sampling capacitor network and the common-mode adjusting capacitor network are connected with a first power supply voltage, a lower polar plate of the common-mode adjustment capacitor network is connected with a first power supply voltage, the lower polar plate, connected to the positive end and the negative end of the comparator, of the sampling capacitor network is connected with a VIP and a VIN; and in the conversion stage, the lower pole plate of the sampling capacitor network is connected witha first power supply voltage or a second power supply voltage, and the lower pole plate of the common-mode adjustment capacitor network is connected with a second power supply voltage. According to the capacitive SAR ADC, the output common-mode voltage can be adjusted, and the adjusted common-mode voltage is smaller than the first power supply voltage, so that signal leakage caused by leakage current can be avoided.

Description

technical field [0001] The invention relates to the technical field of semiconductors, in particular to a capacitive SAR ADC. Background technique [0002] Successive Approximation (SAR) Analog-to-Digital Converter (Analog-to-Digital Converter, ADC) is a low-speed, medium-high-resolution structure, the sampling speed is usually below 10M, and the resolution is generally 8-16 bits. The SAR architecture allows high-performance, low-power ADCs to be housed in small packages, suitable for size-critical systems. These characteristics enable SAR ADC to obtain a wide range of applications, such as portable battery-powered instruments, various sensor chips, industrial control and data signal collectors, etc. [0003] For traditional SAR ADCs such as figure 1 As shown, it contains the capacitor array DAC, comparator CMP and SAR control logic. In the sampling phase, the lower plate of the capacitor array C0-C10 is connected to the input signal through the switch S10-S0, and the upp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/46
CPCH03M1/466
Inventor 唐华刘飞
Owner SEMICON MFG INT (SHANGHAI) CORP
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