A low-voltage high-frequency CMOS fully-differential filtering technique is presented. The low internal voltage characteristic of current-mode circuits allows the operation at power supply voltages as low as 3 V with high dynamic range. The integrator time constant is determined by a MOSFET small-signal transconductance and an additional noncritical MOSFET gate capacitance. For ladder filters derived from doubly-terminated LC prototypes, HSPICE (simulation program with IC emphasis) simulations predict a 3-dB bandwidth of 125 MHz for a three-pole lowpass filter. Power dissipation is 6 mW/pole with a 3-V power supply. >
['Rajesh H. Zele', 'Sang-Soo Lee', 'David J. Allstot']
A 3V-125 MHz CMOS continuous-time filter