A Reconfigurable 0.1–10 MHz DT Passive Dynamic Zoom ADC for Cellular Receivers

Abstract

This paper presents a multi-mode, dynamically zooming analog to digital converter (ADC). The architecture is based on a 5b interpolating flash ADC as the zooming unit and a passive discrete-time ΔΣ modulator as the fine conversion unit. The proposed ADC provides a dynamic zooming technique, employing an interpolating zooming front-end. The modulator covers between 0.1 MHz and 10 MHz signal bandwidth which makes it suitable for cellular applications including 4G radio systems. By reconfiguring the OSR, bias current, and component parameters, optimal power consumption can be achieved for every mode. The ADC is implemented in 0.13 μm CMOS technology and it achieves an SNDR of 83/75.7/73.2/67 dB for 0.1/1.92/5/10MHz bandwidth with 1.3/4.7/8.1/10.3mW power consumption from a 1.2 V supply.