A novel CMOS tunable transconductor is presented.
The circuit operates in classAB hence featuring power efficiency.
The internal feedback employed and the use of a linearized triode
transistor for voltage-to-current conversion allows achieving high
linearity. Rail-to-rail input range is obtained by using floatinggate
transistors. Measurement results for a test chip prototype in
a 0.5µm standard CMOS process show an IM3 of -52.13dB at
1MHz for a 2Vpp input and a power consumption of 2.2mW