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Successive approximation analog-to-digital converter and operation method thereof

A technology of analog-to-digital converter and operation method, which is applied in the direction of analog-to-digital conversion, instrument, code conversion, etc., can solve the problems of variation, continuous approximation analog-to-digital converter error signal noise distortion ratio, etc., to reduce the amount of errors , Reduce the degree of impedance mismatch and improve the effect of impedance matching

Pending Publication Date: 2020-06-23
REALTEK SEMICON CORP
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  • Description
  • Claims
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Problems solved by technology

The mismatch of impedance causes the error of the continuous approximation analog-to-digital converter or the signal-to-noise and distortion ratio (SNDR) to deteriorate

Method used

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  • Successive approximation analog-to-digital converter and operation method thereof
  • Successive approximation analog-to-digital converter and operation method thereof
  • Successive approximation analog-to-digital converter and operation method thereof

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Embodiment Construction

[0018] The technical terms in the following description refer to the customary terms in this technical field. If some terms are explained or defined in this manual, the explanations of these terms shall be based on the descriptions or definitions in this manual.

[0019] The disclosure in this case includes a continuous approximation analog-to-digital converter and a method of operation thereof. Since some of the components included in the continuous approximation analog-to-digital converter of the present application may be known components individually, so without affecting the full disclosure and practicability of the device embodiment, the following description is for the known components Details will be omitted.

[0020] figure 2 It is a functional block diagram of a continuous approximation analog-to-digital converter shown according to an embodiment of the present case, image 3 It is a flow chart of the operation method of the continuous approximation analog-to-digi...

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Abstract

The invention discloses a successive approximation analog-to-digital converter and an operation method thereof. The successive approximation analog-to-digital converter is used for converting an analog input signal into a digital code and comprises a switched capacitor type digital-to-analog converter, and the switched capacitor type digital-to-analog converter comprises a plurality of capacitors.The operation method comprises the following steps: switching the terminal voltage of at least one target capacitor in the capacitors according to data in a sampling stage; sampling the analog inputsignal in the sampling stage; switching the terminal voltage of the at least one target capacitor after the sampling stage; comparing the outputs of the switched capacitor digital-to-analog converterto obtain a plurality of comparison results, wherein the comparison results form the digital code; and switching the terminal voltage of part of the capacitors according to the comparison results.

Description

technical field [0001] This case is about successive approximation register (SAR) analog to digital converter (ADC), especially about the use of switch-capacitor (switch-capacitor) digital-to-analog converter (digital-to-analog converter, DAC) continuous approximation analog-to-digital converter. Background technique [0002] In the following description, one end of the capacitor coupled to the comparator is referred to as an upper plate, and one end not coupled to the comparator is referred to as a lower plate. Such a definition is just for convenience of explanation, and is not necessarily related to "up" and "down" in actual circuits. [0003] Sequential approximation analog-to-digital converters usually include comparators and switched capacitor digital-to-analog converters, figure 1 The internal circuitry of comparator 105 and conventional switched capacitor DAC 110 is shown. The switched capacitor DAC 110 includes two capacitor arrays, each capacitor array includes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/38
CPCH03M1/38
Inventor 雷良焕黄诗雄
Owner REALTEK SEMICON CORP
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