Sein Oh, Younggyun Oh, Juyoung Lee, Kihyun Kim, Seungjun Lee, Jintae Kim, Hyungil Chae
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A 80dB DR 6MHz Bandwidth Pipelined Noise-Shaping SAR ADC with 1–2 MASH structure
A pipelined NS-SAR ADC with 1–2 MASH structure is presented. Two-stage pipelined structure consisting of 5-bit NS-SAR and 4-bit NS-SAR ADCs shows 3rd-order noise-shaping. To maximize power efficiency, a single operational transconductance amplifier (OTA) is reused for both an integrator for noise shaping and a residue amplifier for pipelining. The measured DR is 80dB when the sampling rate is 83.3MS/s and bandwidth is 6MHz, and power consumption is 3.5mW showing FoMs,DR of 172.3dB. The proposed ADC structure greatly relaxes design requirement of each SAR quantizer, and can achieve high resolution and wide bandwidth with good power efficiency.
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