Title :
Low-distortion continuous-time integrated filters for low frequency applications
Author :
Fei, Haibo ; Geiger, Randall
Author_Institution :
Electr. & Comput. Eng. Dept., Iowa State Univ., Iowa City, IA, USA
Abstract :
A technique for designing high-linearity continuous-time integrated filters for low frequency applications using transconductance network is presented. With this technique, an area-efficient transconductance network is used to replace the large resistors in low-frequency integrator-based continuous-time filters. The key challenge with this technique is in determining and realizing the appropriate relationship between the transconductance circuit and the nonideal frequency-dependent properties of the opamp. Simulation results for a third-order Bessel low-pass filter designed in a 0.5μm CMOS process with a cutoff frequency of 5 kHz provide a THD in excess of 70 dB for a 2V p-p output with the 5 V power supply.
Keywords :
Bessel functions; CMOS analogue integrated circuits; continuous time filters; low-pass filters; 0.5 micron; 2 V; 5 V; 5 kHz; CMOS; THD; area-efficient transconductance network; cutoff frequency; low frequency applications; low-distortion continuous-time integrated filters; nonideal frequency-dependent properties; opamp; third-order Bessel low-pass filter; Application software; CMOS process; Circuit simulation; Cutoff frequency; Linearity; Low pass filters; Resistors; Temperature dependence; Transconductance; Transconductors;
Conference_Titel :
Circuits and Systems, 2002. MWSCAS-2002. The 2002 45th Midwest Symposium on
Print_ISBN :
0-7803-7523-8
DOI :
10.1109/MWSCAS.2002.1187046