Large f0Q second order filters using multiple output OTAs

It is shown and verified experimentally that a multiple output nonlinearized 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 programmable f₀ and Q values in CMOS technology. Filter types presented are lowpass and bandpass. It is shown that with the proposed approach, filters with products f₀Q close to the maximum allowed by the technology can be synthesized. Experimental results of 2 μm CMOS test-chip second-order filters with f₀Q=2 GHz are presented