A 100MHz 7/sup th/-order g/sub m/-C filter with a wide-range transconductance amplifier

This paper describes the g/sub m/-C filter design with the proposed wide-range transconductance amplifier. The transconductance amplifier includes the auxiliary positive feedback differential pair to enhance the operating range with small variation of g/sub m/ value. The 100MHz 7/sup th/-order 0.05/spl deg/ equiripple linear-phase lowpass filter is designed in a 0.35-/spl mu/m CMOS technology. The 3-dB frequency can be finely programmed and maintained through on-chip tuning PLL. The filter operates at the single power supply voltage of 3.3V.