Successive approximation type ADC and asynchronous logic control circuit thereof
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A successive approximation type, control circuit technology, applied in electrical components, electrical signal transmission systems, signal transmission systems, etc., can solve problems such as long conversion time, and achieve the effect of short setup time, sufficient setup, and shortened conversion time.
Active Publication Date: 2021-06-25
MICROTERA SEMICON (GUANGZHOU) CO LTD
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[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a successive approximation ADC and its asynchronous logic control circuit, which is used to solve the problem of long conversion time in the prior art
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Embodiment 1
[0044] like figure 1 As shown, this embodiment provides an asynchronous logic control circuit 1 applied to a successive approximation ADC, and the asynchronous logic control circuit 1 includes:
[0045] The n-stage capacitor voltage tracking module and the logic module 12, wherein, n is a natural number greater than or equal to 2.
[0046] like figure 1 As shown, the capacitor voltage tracking modules at all levels track the voltage establishment of each weight bit capacitor in the digital-to-analog conversion module of the successive approximation ADC respectively, and generate corresponding control signals after the voltage on each capacitor is established, and based on The control signal outputs a corresponding pulse signal; the capacitor voltage tracking modules at all levels are connected sequentially, the higher the weight of the capacitor corresponding to the capacitor voltage tracking module, the higher the level, and the subsequent capacitor voltage tracking module rec...
Embodiment 2
[0055] like figure 2 As shown, the present embodiment provides a successive approximation ADC, and the successive approximation ADC includes:
[0056] An analog-to-digital conversion circuit 2 and an asynchronous logic control circuit 1 .
[0057] like figure 2 As shown, the asynchronous logic control circuit 1 generates a logic control clock CK_COMP.
[0058] Specifically, the structure and working principle of the asynchronous logic control circuit 1 refer to Embodiment 1, which will not be repeated here.
[0059] like figure 2 As shown, the analog-to-digital conversion circuit 2 receives the logic control clock CK_COMP, and performs analog-to-digital conversion based on the logic control clock CK_COMP.
[0060] Specifically, the structure of the analog-to-digital conversion circuit 2 can be set as required, including but not limited to a single-ended structure and a differential structure. In this embodiment, the analog-to-digital conversion circuit 2 adopts a diffe...
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Abstract
The invention provides a successive approximation type ADC and an asynchronous logic control circuit thereof, and the circuit comprises n stages of capacitor voltage tracking modules, wherein each stage of capacitor voltage tracking module tracks the voltage establishment of each weight bit capacitor in the successive approximation type ADC, and generates a corresponding control signal and a pulse signal after the establishment is completed, capacitor voltage tracking modules are connected in sequence, the higher the weight bit of the capacitor is, the higher the level of the capacitor voltage tracking module corresponding to the capacitor is, and the rear-stage capacitor voltage tracking module receives a control signal output by the front-stage capacitor voltage tracking module and starts to work after the front-stage capacitor voltage tracking module completes voltage establishment; and a logic module connected to the output end of each stage of capacitor voltage tracking module, and triggers a logic control clock based on the pulse signal output by any stage of capacitor voltage tracking module. According to the method, establishment of different weight bits of the DAC can be simulated, so that a proper control clock is accurately generated, and the effects of saving time and improving the conversion speed of the ADC are achieved.
Description
technical field [0001] The invention relates to the field of integrated circuit design, in particular to a successive approximation ADC and its asynchronous logic control circuit. Background technique [0002] An analog-to-digital data converter (ADC) is an essential electronic component for converting natural analog signals to computer digital signals. High-speed and high-precision ADCs have always been one of the most important trends in the development of ADCs. Whether it is academic or industrial applications, people are unanimously committed to how to improve the accuracy and how to break through the speed limit. [0003] The conversion cycle of the ADC can be divided into two stages according to the chronological order of the actual work. The first stage is sampling, which accurately samples the analog signal to be converted to the capacitor and holds it; the second stage is conversion, which is to convert the first The analog signal obtained by the stage sampling is ...
Claims
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