High Swing Ultra-Wide Bandwidth with Very High CMMR Fully Differential Operational Amplifier in 0.18μm CMOS

This p a p e r presents a low power, h i g h ga in and high CMRR ful ly differential ultra-wide bandwidth operational amplifier with wide dynamic range. The design uses two-stage gain, high swing common-mode feedback, ‘doublet-free’ pole-zero cancelation and gm–boosting techniques to increases the unity gain frequency. Design and implementation results for a 1.2GHz, 1.8V supply, fully differential op-amp with 3 V differential output swing and 85 dB low frequency gain, 145 dB CMRR in 0.18μm digital CMOS technology are presented.