A 1-V 25-µW low-noise CMOS programmable gain pre-amplifier for digital hearing aid

Author

Xiaoming Qi ; Dongmei Li ; Zhihua Wang

Author_Institution

Inst. of Microelectron., Tsinghua Univ., Beijing, China

fYear

2014

Firstpage

1

Lastpage

2

Abstract

A low-voltage low-noise programmable gain pre-amplifier (PGA) is presented in this paper. The proposed PGA is based on a fully-differential source-degeneration structure with g_m-boosting circuitry. The design is implemented in UMC 0.18um CMOS process and occupies an active area of 0.128 × 0.08 mm². It dissipates only 25-μW from a single 1-V supply. The total harmonic distortion (THD) is below -50dB over the audio frequencies at 0.2-Vpp differential output. The single-stage gain ranges from 12dB to 27dB in 3dB step with a gain error of less than 0.4dB. When set at the max gain, the equivalent input noise is 25 nV/√Hz at 1kHz, the white noise is 16.4 nV/√Hz and the integrated noise in the audio range (20~20kHz) is 3μV.

Keywords

CMOS integrated circuits; biomedical electronics; harmonic distortion; hearing aids; low noise amplifiers; preamplifiers; white noise; THD; UMC CMOS process; digital hearing aid; equivalent input noise; gain 12 dB to 27 dB; gm-boosting circuitry; low-noise CMOS pre-amplifier; low-voltage low-noise PGA; power 25 muW; programmable gain pre-amplifier; size 0.08 mm; size 0.128 mm; size 0.18 mum; source-degeneration structure; total harmonic distortion; voltage 1 V; voltage 3 muV; white noise; CMOS process; Tuning; PGA; gm-boosting; high linearity; low-noise; low-voltage; source-degeneration;

fLanguage

English

Publisher

ieee

Conference_Titel

Electron Devices and Solid-State Circuits (EDSSC), 2014 IEEE International Conference on

Type

conf

DOI

10.1109/EDSSC.2014.7061171

Filename

7061171