Successive approximation type analog-to-digital converter based on noise shaping

An analog-to-digital converter and successive approximation technology, applied in analog/digital conversion, code conversion, instruments, etc., can solve the problems of poor compatibility of process evolution, weak noise shaping ability, high static power consumption, etc., to increase design Effects of complexity, low power consumption, and increased tolerance

Active Publication Date: 2021-08-27
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, there are still some problems in the loop in the noise shaping SAR ADC: 1. The active noise shaping SARADC based on the transconductance operational amplifier has strong shaping ability, but the static power

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  • Successive approximation type analog-to-digital converter based on noise shaping
  • Successive approximation type analog-to-digital converter based on noise shaping
  • Successive approximation type analog-to-digital converter based on noise shaping

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Embodiment Construction

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0041] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediar...

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Abstract

The invention discloses a successive approximation type analog-to-digital converter based on noise shaping. In the successive approximation type analog-to-digital converter, a bootstrap boost sampling switch is adopted for sampling on a capacitive digital-to-analog converter, and a non-binary array is adopted for redundancy calibration; the noise shaping loop comprises a clock control module, a closed-loop dynamic amplifier and a switched capacitor module, the closed-loop dynamic amplifier amplifies the margin voltage after successive approximation, a positive feedback structure is added to improve the response speed, and in the switched capacitor module, the capacitance stacking technology is adopted for collecting, delaying and feeding back margin information to achieve the operation of adding the margin information with a sampling signal. The whole noise transmission function is realized, and the noise shaping effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a successive approximation analog-to-digital converter based on noise shaping. Background technique [0002] The rise of 5G communications and the Internet of Things (IoT) has brought unprecedented connectivity and sensing needs to emerging electronic systems. In addition to stringent requirements for power efficiency, many emerging systems are increasingly demanding higher ADC resolutions. However, in the case of SAR type ADCs, high resolution design becomes very challenging. Although the hardware complexity of a SAR-type ADC remains relatively constant in the medium resolution range (eg, 6-10 bits), its power consumption complexity increases dramatically as the resolution increases. In high-resolution SAR-type ADCs, performance is limited by thermal noise (including comparator noise and sampling kT / C noise) and capacitor mismatch. If these limitations...

Claims

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Application Information

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IPC IPC(8): H03M1/38
CPCH03M1/38Y02D30/70
Inventor 耿莉景玺鑫
Owner XI AN JIAOTONG UNIV
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