一种185 μW−105.1 dB THD 88.6 dB SNDR负r稳定音频前置放大器

ESSCIRC 2019 - IEEE 45th European Solid State Circuits Conference (ESSCIRC) Pub Date : 2019-09-01 DOI:10.1109/ESSCIRC.2019.8902846

Seungwoo Song, Changuk Lee, Moonhyung Jang, Youngcheol Chae

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引用次数: 5

摘要

提出了一种用于高保真音频编解码器的低功耗前置放大器。它采用负r稳定放大器架构，在低频路径上采用负r辅助放大器，以消除主放大器的非理想性，从而在低功率下实现高线性度。这显示了放大器的带内噪声衰减和线性度的急剧改善。该前置放大器采用65纳米CMOS工艺，在20 kHz带宽下实现- 105.1 dB THD、88.6 dB SNDR和89.3 dB DR，增益为20 dB，功耗仅为185 μW。这导致了在音频前置放大器中168.9 dB的最高能量效率的FoMSNDR。

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A 185 μW −105.1 dB THD 88.6 dB SNDR Negative-R Stabilized Audio Preamplifier

This paper presents a low-power preamplifier for high fidelity audio codecs. It attains high linearity at low power by using a negative-R stabilized amplifier architecture that employs a negative-R assisted amplifier in a low-frequency path to cancel the non-idealities of a main amplifier. This shows the in-band noise attenuation of amplifiers and the drastic improvement of the linearity. Fabricated in a 65-nm CMOS process, the preamplifier achieves −105.1 dB THD, 88.6 dB SNDR, and 89.3 dB DR with 20 dB gain in 20 kHz bandwidth, while consuming only 185 μW from a 1.2 V supply. This results in the highest energy-efficiency FoMSNDR of 168.9 dB among audio preamplifiers.

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ESSCIRC 2019 - IEEE 45th European Solid State Circuits Conference (ESSCIRC)

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