A 3 V 10 MHz pseudo-differential SC bandpass filter using gain enhancement replica amplifier

This paper describes the design strategy and implementation of a high frequency low voltage pseudo-differential SC filter which use opamps with gain enhancement replica amplifier. Experimental results of a biquad SC bandpass with a center frequency of 10 MHz and a Q of 10 are presented. The realized opamp has an open-loop unity-gain bandwidth of 850 MHz, a phase margin of about 62/spl deg/, and a dc gain of 50 dB. The prototype filter dissipates 23 mW from a 3 V supply and occupies 0.3 mm/sup 2/ in a 0.8 /spl mu/m N-well single-poly, double-metal CMOS process.