An 85–225MHz Chebyshev-II active-RC BPF with programmable BW and CF achieving over 30dBm IIP3 in 40nm CMOS

A new technique to design for zero capacitance spread (ZCS) is reported for an 8th-order Chebyshev-II active-RC BPF that enables the application of integrator frequency compensation (IFC). Combined with wideband op-amps employing a current-reusing, split-path feed-forward compensation (FFC) technique, significant power savings is achieved in a 40nm CMOS prototype that measures a center frequency (CF) of 85-225 MHz and four bandwidth-to-center frequency (BW/CF) ratios of 5%-40%. Both the CF and BW/CF ratios are digitally programmable. The prototype consumes 33 mA from a 1.5V supply, with a peak measured in-band IIP3 of 31 dBm.