Title :
Low-voltage highly-linear transconductor design in subthreshold CMOS
Author :
Furth, Paul M. ; Ommani, Henry A.
Author_Institution :
Klipsch Sch. of Electr. & Comput. Eng., NM, USA
Abstract :
We present four circuits implemented in subthreshold CMOS which greatly increase the linear range over the basic differential pair. These circuits are appropriate for low voltage applications since there is no stacking of saturated transistors. The first circuit topology employs multiple asymmetric differential pairs. The second is a symmetric “bump” transconductor. The remaining two use source degeneration via double diffusers. These circuits are analyzed and optimized using a symbolic simulation package and verified in T-SPICE. A linear range of ±49 mV is demonstrated for the two most complex transconductor designs using a 2-Volt supply
Keywords :
CMOS analogue integrated circuits; SPICE; circuit analysis computing; continuous time filters; differential amplifiers; digital simulation; network topology; -49 to 49 mV; 2 V; T-SPICE; circuit topology; continuous-time filters; double diffusers; highly-linear transconductor design; low voltage applications; multiple asymmetric differential pairs; source degeneration; subthreshold CMOS; symbolic simulation package; symmetric bump transconductor; CMOS technology; Circuit analysis; Circuit simulation; Circuit topology; Delta modulation; Equations; Filters; MOSFET circuits; Transconductance; Transconductors;
Conference_Titel :
Circuits and Systems, 1997. Proceedings of the 40th Midwest Symposium on
Conference_Location :
Sacramento, CA
Print_ISBN :
0-7803-3694-1
DOI :
10.1109/MWSCAS.1997.666057
