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This paper presents an adaptation of a transconductor built around MOSFETs operating in saturation. The circuit operates off a 3.3 V single supply and has a fully differential 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 TSMC (Taiwan Semiconductor Manufacturing Corporation) 0.18 μm CMOS technology. Tuned by a DC voltage Vfo the filter center frequency was measured to be almost linearly adjustable from 833 kHz up to 1.3 MHz. The common mode voltage at the filter output was also observed to vary by no more than 24 mV about the desired value. A maximum THD of -35 dB is guaranteed at Vout=600 mVpp within the tuning range of the filter.
Electrical and Computer Engineering, 2002. IEEE CCECE 2002. Canadian Conference on (Volume:1 )
Date of Conference: 2002