High-speed switch time sequence for successive approximation type analog-digital converter

Abstract

The invention provides a high-speed switch time sequence for a successive approximation type analog-digital converter. The analog-digital converter comprises N orderly connected capacitor banks, each capacitor bank comprises a first capacitor array and a second capacitor array; the first capacitor bank is in a second connection state, and other capacitor banks are in a first connection state; the first connection state is as follows: a lower pole plate of the first capacitor array is connected with low-level voltage, a lower pole plate of the second capacitor array is connected with high-level voltage; the second connection state is as follows: the lower pole plate of the first capacitor array is connected with the high-level voltage, and the lower pole plate of the second capacitor array is connected with the low-level voltage; the high-speed switch time sequence further comprises a comparator, upper pole plates of all first capacitor arrays are connected with a first input end of the comparator, the upper pole plates of all second capacitor arrays are connected with a second input end of the comparator; a logic module is connected with the comparator and used for controlling the connection states of the capacitor banks according to internally stored time slot instructions. According to the time sequence provided by the invention, the capacitance area of the analog-digital converter is smaller, and the conversion speed is faster.

Description

technical field [0001] The invention relates to the field of analog-to-digital conversion, in particular to a high-speed switching sequence for successive approximation analog-to-digital converters. Background technique [0002] As a bridge connecting the analog system and the digital processing system, the analog-to-digital converter's low power consumption design is particularly important. Successive approximation analog-to-digital converters are widely used in various high-speed and low-power systems because of their high speed, simple structure, small area, and high power consumption utilization. [0003] Successive approximation analog-to-digital converters are generally capacitive structures. Existing analog-to-digital converters are limited by the technology. Generally, N-bit analog-to-digital converters need to use more than N+2 pairs of capacitors to achieve analog-to-digital conversion. The value of the unit capacitor is generally large and requires a large capaci...

AI Technical Summary

Problems solved by technology

Existing analog-to-digital converters are limited by the technology. Generally, N-bit analog-to-digital converters need to use more than N+2 pairs of capacitors to achieve analog-to-digital conversion. The value of the unit capacitor is generally large and requires a large capacitor. area, resulting in a slow speed during the analog-to-digital conversion process, reducing the overall speed of the successive approximation analog-to-digital converter

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