Title :
A 3 V linear input range tunable CMOS transconductor and its application to a 3.3 V 1.1 MHz Chebyshev low-pass Gm-C filter for ADSL
Author :
Lee, Jim-Yih ; Tu, Chien-Cheng ; Chen, Wei-Hong
Author_Institution :
Electron. Res. & Service Organ., Ind. Technol. Res. Inst., Hsinchu, Taiwan
Abstract :
A fully differential CMOS transconductor with 3 V linear input range is proposed. The Gm value of the transconductor is tunable through a current division scheme. A current mode arithmetic method is used to adaptively bias the transconductor tuning stage. A 3.3 V 1.1 MHz Chebyshev low-pass Gm-C filter using this highly linear transconductor achieves a IM3 distortion at 300 kHz of -62 dBc for a 2 Vppd input signal. The filter was fabricated with a double poly triple metal 0.35 μm CMOS process and consumes 66 mW
Keywords :
CMOS analogue integrated circuits; Chebyshev filters; active filters; active networks; circuit feedback; circuit tuning; digital subscriber lines; low-pass filters; 0.35 micron; 1.1 MHz; 3.3 V; 66 mW; ADSL application; Chebyshev low-pass Gm-C filter; adaptive bias scheme; asymmetric DSL; current division scheme; current mode arithmetic method; double poly triple metal CMOS process; fully differential CMOS transconductor; linear input range; transconductor tuning stage biasing; tunable CMOS transconductor; CMOS process; Chebyshev approximation; Circuit optimization; Feedback loop; Linearity; Low pass filters; Nonlinear filters; Resistors; Transconductance; Transconductors;
Conference_Titel :
Custom Integrated Circuits Conference, 2000. CICC. Proceedings of the IEEE 2000
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-5809-0
DOI :
10.1109/CICC.2000.852692
