Title :
A 3V-125 MHz CMOS continuous-time filter
Author :
Zele, Rajesh H. ; Lee, Sang-Soo ; Allstot, David J.
Author_Institution :
Dept. of Electr. & Comput. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA
Abstract :
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
Keywords :
CMOS analogue integrated circuits; SPICE; circuit analysis computing; continuous time filters; integrating circuits; ladder filters; 125 MHz; 3 V; CMOS continuous-time filter; HSPICE; MOSFET small-signal transconductance; current-mode circuits; doubly-terminated LC prototypes; dynamic range; fully-differential filtering technique; integrator time constant; ladder filters; low internal voltage characteristic; noncritical MOSFET gate capacitance; power dissipation; power supply voltages; three-pole lowpass filter; CMOS technology; Current mode circuits; Dynamic range; Filtering; Filters; Integrated circuit modeling; Low voltage; MOSFET circuits; Power supplies; Predictive models;
Conference_Titel :
Circuits and Systems, 1993., ISCAS '93, 1993 IEEE International Symposium on
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-1281-3
DOI :
10.1109/ISCAS.1993.393934
