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This paper presents an adaptation of a transconductor built around MOSFETs operating in saturation. The circuit operates of a 3.3 V single supply and has a fully diTerentia1 output. A common mode feedback circuit maintains the output near midsupply. Simulation results show that the transconductor is linearly tunable over a wide range of bias voltages. The transconductor is used to realize a second order filter in TSMCs 0.18 ,um CMOS technologv Tuned by a DC voltage qo the filter k center jkquency was measured to be almost linearly a&ustable@om 833 ldiz up to 1.3 A4H.z. The common mode voltage at the filter 5 output was also observed to va y by no more than 24 m V about the desired value. A maximum THD of -35 dB is guaranteed at Vout = 600 mVpp within the tuning range of thefilter

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