An 800MS/s, 6.7b ENOB Bootstrap Switching S/H IC for Wideband Direct RF Sub-Sampling Receiver in 45 nm CMOS

Direct sampling RF receivers have become widely used in modern communication systems due to its agile operation. However, the sampling speed of the existing ADC can’t meet the requirements of direct sampling of RF signals. The application of sub-sampling technology is inevitable. The noise aliasing in the sub-sampling receiver puts forward higher requirements on the performance of the sampling and holding circuit. In this paper, we demonstrated a wideband S/H circuit for direct sub-sampling receiver in 45nm CMOS process. Bootstrap technology has been applied to improve SNDR performance by controlling the most important distortion source. With 800MHz sampling rate, the post-layout simulated results show that |S11| is lower than -30dB. The signal-to-noise and distortion ratio (SNDR) is higher than 42.33dB. The spurious-free dynamic range (SFDR) is higher than 45.06dB.