A Single-Channel 12-Bit 2GS/s 1.7GHz-ERBW Aperture-Error-Free Pipelined ADC with Flash-Embedded MDAC

This paper proposes a flash-embedded MDAC that eliminates the aperture error between the flash quantizer and MDAC in SHA-less pipelined ADCs, enabling high ERBW at a high sampling rate. Additionally, the first-stage flash ADC reuses the switched-capacitor circuit in MDAC to generate accurate quantization threshold voltages with low power consumption. These techniques are demonstrated in a 12-bit 2GS/s single-channel pipelined ADC, achieving an ERBW of 1.7GHz. At the Nyquist input frequency, the measured SNDR and SFDR are 58.3 dB and 73.4 dB, respectively. Consuming 23.26mW from a 1V supply, the ADC achieves a FoMs of 168.4 dB and a FoMw of 17.3 fJ/conv. -step, respectively.