Title :
A 50 Mhz 5TH order elliptic LP-filter using current mode Gm-C topology
Author :
Kosunen, Marko ; Koli, Kimmo ; Halonen, Kari
Author_Institution :
Electron. Circuit Design Lab., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
A 50 Mhz 5th order elliptic LP-filter with current mode Gm-C topology has been designed for 0.5 μm CMOS process and 3.3 V supply voltage. A low distortion level has been achieved by using dynamic biasing as a linearization principle. In order to further reduce the level of distortion, scaling for minimum distortion has been done. The effect of poles caused by parasitic capacitances has been canceled with phase lag compensation resistances realized with transistors biased in the saturation region in order to achieve high adjustability. With this topology the level of third order harmonic approximately -55 dBc with 500 μApp input current has been achieved. The simulated dynamic range of the filter is 60 dB and it has power dissipation of 91 mW
Keywords :
CMOS analogue integrated circuits; active filters; elliptic filters; harmonic distortion; low-pass filters; 0.5 micron; 3.3 V; 50 MHz; 500 muA; 91 mW; CMOS process; current mode Gm-C topology; dynamic biasing; dynamic range; fifth order elliptic LP filter; linearization; parasitic capacitance; phase lag compensation resistance; poles; power dissipation; scaling; third order harmonic distortion; CMOS technology; Circuit topology; Distortion; Frequency; Low pass filters; Power dissipation; Power harmonic filters; Transconductance; Variable structure systems; Voltage;
Conference_Titel :
Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4455-3
DOI :
10.1109/ISCAS.1998.704518
