Title :
A 0.9 V wide-input-range bulk-input CMOS OTA for Gm-C filters
Author :
Grech, Ivan ; Micallef, J. ; Azzopardi, Joseph Micallex George ; Debono, Carl J.
Author_Institution :
Dept. of Microelectron., Univ. of Malta, Msida, Malta
Abstract :
The Gm-C technique is extensively used for continuous-time filtering applications because it results in tunable, wideband and compact designs. In this paper, an OTA capable of operating at a supply voltage of 0.9 V is proposed using a novel bulk-input differential pair without the use of a tail current source. Good CMRR (63 dB) is still achieved by using the gate terminal to control the total current in the differential pair, via the use of a dummy pair. The OTA also exhibits a wide differential input range of ± 600 mV and good Gm- tunability. Simulation and test results are also presented with the OTA used in a second order cochlea low-pass filter. For this design, a standard double-poly double-metal CMOS process has been used, having a nominal threshold voltage of around 0.7 V.
Keywords :
CMOS analogue integrated circuits; Q-factor; continuous time filters; current mirrors; frequency response; low-pass filters; low-power electronics; operational amplifiers; wideband amplifiers; 0.9 V; CMOS OTA; DC transfer characteristic; Gm-C filters; bulk-input differential pair; continuous-time filtering; current mirrors; differential bias currents; double-poly double-metal CMOS process; second order cochlea low-pass filter; wide-input-range bulk-input OTA; wideband compact designs; Electronic mail; Filtering; Low pass filters; Low voltage; Microelectronics; Mirrors; Tail; Testing; Tunable circuits and devices; Wideband;
Conference_Titel :
Electronics, Circuits and Systems, 2003. ICECS 2003. Proceedings of the 2003 10th IEEE International Conference on
Print_ISBN :
0-7803-8163-7
DOI :
10.1109/ICECS.2003.1301912
