Title :
A low distortion wideband active-RC filter for a multicarrier base station transmitter
Author_Institution :
Nokia Res. Center, Helsinki
Abstract :
A fifth order elliptic active-RC low-pass filter with an on-chip capacitor tuning for a highly integrated multicarrier base station transmitter is presented. The cutoff frequency of 16.5 MHz and high linearity are achieved with the folded cascode operational amplifiers, which achieve a large GBW, high linearity and insensitivity to the process and temperature variations. The THD level of over -75 dBc is achieved with a 1 V p-p, 5.4 MHz test signal. A modern 0.35 μm, 3.3 V CMOS process is used
Keywords :
CMOS analogue integrated circuits; RC circuits; active filters; circuit tuning; elliptic filters; low-pass filters; operational amplifiers; radio transmitters; radiofrequency filters; 0.35 micron; 16.5 MHz; 3.3 V; CMOS process; fifth order elliptic filter; folded cascode opamps; folded cascode operational amplifiers; high linearity; low distortion RC filter; low-pass filter; multicarrier base station transmitter; onchip capacitor tuning; wideband active-RC filter; Base stations; Broadband amplifiers; Capacitors; Cutoff frequency; Linearity; Low pass filters; Operational amplifiers; Transmitters; Tuning; Wideband;
Conference_Titel :
Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-6685-9
DOI :
10.1109/ISCAS.2001.921836
