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Article

A 5-nV/√Hz Chopper Negative-R Stabilization Preamplifier for Audio Applications

1
College of Computer Engineering and Sciences, Prince Sattam bin Abdulaziz University, P.O. Box 151, Alkharj 11942, Saudi Arabia
2
Aix Marseille University, CNRS, IM2NP UMR 7334, 13451 Marseille, France
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(5), 478; https://doi.org/10.3390/mi11050478
Received: 11 April 2020 / Revised: 29 April 2020 / Accepted: 1 May 2020 / Published: 2 May 2020
(This article belongs to the Special Issue Next Generation RFID Transponders)
This paper presents a low-noise and low-power audio preamplifier. The proposed low-noise preamplifier employs a delay-time chopper stabilization (CHS) technique and a negative-R circuit, both in the auxiliary amplifier to cancel the non-idealities of the main amplifier. The proposed technique makes it possible to mitigate the preamplifier 1/f noise and thermal noise and improve its linearity. The low-noise preamplifier is implemented in 65 nm complementary metal-oxide semiconductor (CMOS) technology. The supply voltage is 1.2 V, while the power consumption is 159 µW, and the core area is 192 µm2. The proposed circuit of the preamplifier was fabricated and measured. From the measurement results over a signal bandwidth of 20 kHz, it achieves a signal-to-noise ratio (SNR) of 80 dB, an equivalent-input referred noise of 5 nV/√Hz and a noise efficiency factor (NEF) of 1.9 within the frequency range from 1 Hz to 20 kHz. View Full-Text
Keywords: preamplifier; chopper stabilization; negative-R; CMOS operational transconductance amplifier (OTA); 1/f noise preamplifier; chopper stabilization; negative-R; CMOS operational transconductance amplifier (OTA); 1/f noise
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MDPI and ACS Style

Nebhen, J.; Alnowaiser, K.; Meillere, S. A 5-nV/√Hz Chopper Negative-R Stabilization Preamplifier for Audio Applications. Micromachines 2020, 11, 478. https://doi.org/10.3390/mi11050478

AMA Style

Nebhen J, Alnowaiser K, Meillere S. A 5-nV/√Hz Chopper Negative-R Stabilization Preamplifier for Audio Applications. Micromachines. 2020; 11(5):478. https://doi.org/10.3390/mi11050478

Chicago/Turabian Style

Nebhen, Jamel, Khaled Alnowaiser, and Stephane Meillere. 2020. "A 5-nV/√Hz Chopper Negative-R Stabilization Preamplifier for Audio Applications" Micromachines 11, no. 5: 478. https://doi.org/10.3390/mi11050478

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