Title :
Very-high-frequency lowpass filter based on a CMOS active inductor
Author :
Xiao, Haiqiao ; Schaumann, Rolf
Author_Institution :
Dept. of Electr. & Comput. Eng., Portland State Univ., OR, USA
Abstract :
An all-transistor lowpass biquad based on an active inductor for operation up to several gigahertz is presented. A convenient parasitic notch near the passband edge sharpens the transition band. The filter can be tuned via biasing and on-chip varactors. Higher order filters can be constructed by simple direct cascading of the second-order blocks. A fifth-order filter example is designed and simulated in TSMC 0.18-μm CMOS technology, with cutoff frequency at 4.57 GHz and passband ripple less than 1 dB.
Keywords :
CMOS analogue integrated circuits; biquadratic filters; cascade networks; circuit tuning; integrated circuit design; low-pass filters; microwave filters; notch filters; 0.18 micron; 4.57 GHz; CMOS active inductor; TSMC 0.18-μm CMOS technology; all-transistor lowpass biquad; biasing; cutoff frequency; direct cascading; fifth-order filter; filter tuning; higher order filters; microwave lowpass filter; on-chip varactors; parasitic notch; passband edge; passband ripple; transition band sharpening; Active inductors; Band pass filters; CMOS technology; Capacitors; Circuits; Equations; Frequency; Passband; Q factor; Transconductors;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Conference_Location :
Phoenix-Scottsdale, AZ
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1010908
