Use DAS Algorithm to Break Through the Device Limitations of Switched-capacitor-based DAC in an ADC Consisting of Pipelined SAR and TDC
Publication in refereed journal


摘要Switched capacitors are widely used in integrated circuits for discrete-time signal processing. Metal-Insulator-Metal (MIM) capacitors and MOSFET switches are commonly used for switched-capacitor circuits. They impose limitations in the power consumption and the bandwidth of the circuits. For instance, the switched-capacitor digital-to-analog converter (DAC) is the critical circuit block that determines the performance in a successive approximation register (SAR) analog-to-digital converters (ADC). In this paper, a design using the detect-and-skip (DAS) algorithm to break through the device limitations of switched-capacitor-based DACs is analyzed in a coarse-fine SAR ADC architecture. When it is shown that compared with the state-of-the-art Vcm-based capacitive DAC (CDAC), the DAS algorithm reduces 55% of the energy and extends the valid bandwidth from 2 MHz to 16 MHz with a 6-bit resolution under the same setting and technology. Besides, a time-to-digital converter (TDC)-assisted pipelined SAR ADC architecture using the DAS algorithm is proposed. Implemented in a 180 nm CMOS process, the 10-bit 10-MS/s prototype measures an energy efficiency of 57.8 fJ/conv.-step.
著者Zhongyi Fu, Xian Tang, Kong-Pang Pun
期刊名稱Solid-State Electronics
頁次119 - 125
關鍵詞Detect-and-skip, Switched capacitor, CMOS process, Energy, Bandwidth, CDAC, ADC, SAR, Pipeline

上次更新時間 2021-17-10 於 23:52