Abstract
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.
Highlights
The Internet of Things (IoT) is recognized by the industry, and in particular the electronics industry, as one of the main engines of growth for the decade to come, if not longer
We present a high-linear chopper negative-R stabilization audio preamplifier, which employs two proposed techniques to reduce the 1/f noise and the thermal noise at the same time
From Equation (23), it is clear that the noise efficiency factor (NEF) parameter includes almost every performance shown in Table 1, namely the equivalent-input referred noise, the power consumption, the bandwidth and indirectly the power-supply rejection ratio (PSRR), and the common-mode rejection ratio (CMRR)
Summary
The Internet of Things (IoT) is recognized by the industry, and in particular the electronics industry, as one of the main engines of growth for the decade to come, if not longer. Still today, MEMS sensors have been manufactured on a large scale for many consumer applications, such as aerospace [1]; inertial sensors in mobile phones, such as gyrometers and accelerometers [2,3]; video game controllers; and airbag triggers These devices, which are the basis of research tools [4], have reached a sufficient maturity to be directly developed and integrated by large industrial groups, such as STMicroelectronics [5]. We present a high-linear chopper negative-R stabilization audio preamplifier, which employs two proposed techniques to reduce the 1/f noise and the thermal noise at the same time.
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