LARGE F0Q 2ND-ORDER FILTERS USING MULTIPLE-OUTPUT OTAS

It is shown and verified experimentally that a multiple output nonline arized operational transconductance amplifier (OTA) can be efficiently used for the practical implementation of very high selectivity Q (Q > 100), high frequency second-order filters (f0 > 10 MHz) with programm able f0 and Q values in CMOS technology. Filter types presented are lo wpass and bandpass. It is shown that with the proposed approach, filte rs with products f0Q close to the maximum allowed by the technology ca n be synthesized. Experimental results of 2 mum CMOS test-chip second- order filters with f0Q = 2 GHz are presented.