A 15 MHz bandwidth sigma-delta ADC with 11 bits of resolution in 0.13μm CMOS

Abstract

A wide bandwidth continuous time sigma-delta ADC implemented in a 0.13 /spl mu/m CMOS technology is introduced. Active blocks are composed of regular threshold voltage devices only. The circuit is targeted for wide-bandwidth applications such as video or wireless base stations. The fourth-order architecture uses an opamp-RC based loop filter and a 4 bit internal quantizer. Operated at 300 MHz clock frequency, the converter achieves a dynamic range of 11 bits over a bandwidth of 15 MHz. The power dissipation is 70mW operated from a 1.5V supply.