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http://dx.doi.org/10.17661/jkiiect.2022.15.5.335

A Single-Bit 3rd-Order Feedforward Delta Sigma Modulator Using Class-C Inverters for Low Power Audio Applications  

Hwang, Jun-Sub (Qualitas Semiconductor)
Cheon, Jimin (School of Electronic Engineering, Kumoh National Institute of Technology)
Publication Information
The Journal of Korea Institute of Information, Electronics, and Communication Technology / v.15, no.5, 2022 , pp. 335-342 More about this Journal
Abstract
In this paper, a single-bit 3rd-order feedforward delta sigma modulator is proposed for audio applications. The proposed modulator is based on a class-C inverter for low voltage and power applications. For the high-precision requirement, the class-C inverter with regulated cascode structure increases its DC gain and acts as a low-voltage subthreshold amplifier. The proposed Class-C inverter-based modulator is designed and simulated in 180-nm CMOS process. With no performance loss and a low supply voltage compatibility, the proposed class-C inverter-based switched-capacitor modulator achieves high power efficiency. This design achieves an signal-to-noise-and-distortion ratio (SNDR) of 93.9 dB, an signal-to-noise ratio (SNR) of 108 dB, an spurious-free dynamic range (SFDR) of 102 dB, and a dynamic range (DR) of 102 dB at a signal bandwidth of 20 kHz and a sampling frequency of 4 MHz, while only using 280 μW of power consumption from a 0.8-V power supply.
Keywords
Analog-to-digital converter; audio application; class-C inverter; delta sigma modulator; feedforward; low power; low voltage; regulated cascode;
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