A high accuracy current charge-pump based MDAC for pipelined ADCs

Add time:08/04/2019    Source:sciencedirect.com

In this paper, a new current charge-pump (CCP) based MDAC is presented. The proposed structure utilizes a new multi-level variable current source (ML-VCS) approach to improve the performance of MDAC in pipelined ADCs. The designed 1.5 bit/stage MDAC is simulated in 0.18 µm scaled CMOS technology with a 2-Vp-p differential full-scale input voltage. The signal-to-noise-and-distortion ratio (SNDR) of the proposed MDAC structure achieves 68 dB at the Nyquist-rate 0.5-Vp-p sinusoidal input with a 2.5 MHz sampling frequency. The power dissipation of MDAC is 7.65 mW under a 1.8-V power supply. Simulation results in HSPICE show that the proposed ML-VCS CCP in MDAC architecture can enhance the accuracy while maintaining the same speed.

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