Successive approximation type analog-to-digital converter based on segmented differential capacitor array

Abstract

The invention discloses a successive approximation type analog-to-digital converter based on a segmented differential capacitor array. The successive approximation type analog-to-digital converter comprises: a sampling switch; a sectional type differential capacitor array which is electrically connected with the sampling switch; a comparator which is electrically connected with the sectional type differential capacitor array; and a successive approximation control logic which is electrically connected with the sectional type differential capacitor array and the comparator. The sectional type differential capacitor array comprises a first capacitor array and a second capacitor array which are symmetrically arranged, an upper pole plate of the first capacitor array is connected with a positive input end of the comparator, and an upper pole plate of the second capacitor array is connected with a negative input end of the comparator; lower polar plates of the first capacitor array and the second capacitor array are selectively and electrically connected to a reference voltage end through a control switch; and each of the first capacitor array and the second capacitor array comprises two sub-capacitor arrays which are connected through a unit bridging capacitor. According to the successive approximation type analog-to-digital converter provided by the invention, the capacitance area is saved, the power consumption is reduced, and the quantization speed is improved.

Description

Technical field [0001] The present invention belongs to the field of integrated circuit technology, particularly relates to a successive approximation ADC based on differential capacitive segmented array. Background technique [0002] As human society continues to progress and development, a large number of portable products have become an everyday part of an integral, and analog to digital converter (ADC) is often constitutes an important module for portable devices. [0003] Since the ADC needs to be applied in radar, communications, medical, instrumentation and other electronic system in the field, so the performance indicators ADC also have different needs. Since SAR A / D converter is simple in structure, less simulation module, smaller area, lower power consumption, and is widely used in high-speed low-precision applications, and can enjoy the advantages of the rapid development of integrated circuit manufacturing technology brings. So / D converter is of great significance...

AI Technical Summary

Problems solved by technology

[0004] However, due to the large capacitor array area of ​​the traditional successive approximation analog-to-digital converter, the digital-to-analog converter has a long settling time, which affects the quantization speed of the analog-to-digital converter and also increases the power consumption of the circuit.

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