A 5-Bit 1.25GS/S 4.7mW delay-based pipelined ADC in 65nm CMOS

Abstract

This paper presents a delay based pipeline (DBP) analog to digital converter (ADC) suitable for high speed and low power applications. Active sample and hold and residue amplifier used in conventional pipeline ADCs are replaced by an analog delay line. The analog delay line is implemented by time-interleaved sampling of the signal in each stage of the ADC. A novel multi-phase clock generator is introduced to generate ADC timing signals. A 5-bit, 1.25 GS/s DBP ADC is designed in 65nm CMOS process. Post-layout simulations confirm that the proposed ADC achieves a peak SNDR of 30.5dB while consuming 4.7mW from a single 1.2V power supply.