Source capacitively coupled compensation technique and its applications

This paper gives the first detailed analyses and derivations of the source capacitively coupled compensation technique. The applications of its useful bandpass and phase-lead features, such as high frequency amplitude compensation amplifier, positive feedback ring oscillator and phase-lead compensation ring oscillator are presented. With this compensation technique the amplifier shows significant bandwidth improvement. The constructed 5 GHz positive feedback (PFB) ring oscillator represents 2-9 dB noise-power product advantage below 10 MHz frequency offset. The compensated negative feedback (NFB) ring oscillator prototype in 0.18 μm CMOS process achieves record 10 GHz oscillation frequency.