A novel tunable third order low-pass Gm-C filter is
introduced. Programmable transconductors operating in class AB
have been used for its implementation hence featuring low
quiescent power consumption. The operation in class AB is
achieved using quasi-floating gate transistors. This filter is
suitable for channel filtering of highly integrated, ultra low
power wireless receivers e.g. for Bluetooth and Zigbee.
Measurement results for a test chip prototype in a low-cost 0.5µm standard CMOS process are presented