A 590 μw, 106.6 dB SNDR, 24 kHz BW Continuous-Time Zoom ADC with a Noise-Shaping 4-bit SAR ADC
Shubham Mehrotra (NXP Semiconductors, Student TU Delft)
Efraim Eland (Student TU Delft)
Shoubhik Karmakar (TU Delft - Electronic Instrumentation)
Angqi Liu (Student TU Delft)
Burak Gonen (TU Delft - Electronic Instrumentation, Ethernovia)
M. Bolatkale (TU Delft - Electronic Instrumentation, NXP Semiconductors)
R. van Veldhoven (NXP Semiconductors)
K. A.A. Makinwa (TU Delft - Microelectronics)
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Abstract
This paper presents a continuous-Time zoom ADC for audio applications. It combines a 4-bit noise-shaping coarse SAR ADC and a fine delta-sigma modulator with a tail-resistor linearized OTA for improved linearity, energy efficiency, and handling of out-of-band interferers compared to previous designs. In 160 nm CMOS, the prototype chip occupies 0.36 mm2, achieves 107.2 dB SNR, 106.6 dB SNDR, and 107.3 dB dynamic range in a 24 kHz bandwidth while consuming 590 μW from a 1.8 V supply. This translates into a Schreier figure-of-merit (FoMs) of 183.4 dB and a FoMSNDR of 182.7 dB.