Work

An improved kT/C noise cancellation technique with presampling for high‐speed SAR ADCs

Year: 2024

Type: article

Abstract: The kT/C noise cancellation technique can effectively reduce the digital‐to‐analog converter (DAC) size for successive approximation register ADCs and thus relax the burden for input drivers and reference buffers. However, the prior kT/C noise cancellation technique suffers from a hard trade‐off between the noise, amplifier bandwidth and linearity. Here, an improved kT/C noise cancellation technique is proposed to break the trade‐off. It uses presampling to hold the input signal unchanged during the noise cancelling phase, leading to significantly relaxed requirements on the bandwidth and linearity of the amplifier. The proposed technique is verified in a 14‐bit 200 MS/s SAR analog‐to‐digital converter (ADC) with a DAC size of 128 fF. Simulation results show that this work achieves 75.6 dB signal to noise and distortion ratio and consumes 1.56 mW power.

Source: Electronics Letters

DOI: 10.1049/ell2.13298

Authors: Yuanfan Gu, Kaipeng Wang, Tiange Yi, Xiaoguo Chen, Shiheng Yang, Jiaxin Liu

Institution: University of Electronic Science and Technology of China

Language: English

Topic: Analog and Mixed-Signal Circuit Design

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,540

Funder: National Natural Science Foundation of China