A 10-GS/s 8-bit 4-way interleaved folding ADC in 0.18 mu m SiGe-BiCMOS

摘要

In this paper, a time-interleaved 10-GS/s 8-bit analog-to-digital converter (ADC) fabricated in 0.18 mu m SiGe BiCMOS technology has been demonstrated. A 4 x 4 input multiplexer with good isolation and wide input bandwidth is proposed, which enables the ADC to support 1/2/4-channel sampling modes. In the track-and-hold (THA) stage, a switched emitter follower (SEF) topology with delayed dummy clock is introduced to minimize the overshoot effect of the SEF output. The ADC achieves spurious free dynamic range (SFDR) 52 dBc and effective number of bits (ENOB) 6.8 in low input frequencies. The analog input bandwidth is 5.6 GHz.