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Title: A 0.9 V wide-input-range bulk-input CMOS OTA for Gm-C filters
Authors: Grech, Ivan
Micallef, Joseph
Debono, Carl James
Azzopardi, George
Keywords: Analog CMOS integrated circuits
Broadband amplifiers
Low voltage integrated circuits
Issue Date: 2003
Publisher: Institute of Electrical and Electronics Engineers Inc.
Citation: Grech, I., Micallef, J., Azzopardi, G., & Debono, C. J. (2003). A 0.9 V wide-input-range bulk-input CMOS OTA for Gm-C filters. 10th IEEE International Conference on Electronics, Circuits and Systems, Sharjah. 818-821.
Abstract: The (3,-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 0.9V is proposed using a novel bulk-input differential pair without the use of a tail current source. Good CMRR (63 dJ3) is still achieved by using the gate terminal to control the total current in the differentia1 pair, via the use of a dummy pair. The OTA also exhibits a wide differential input range of k 600mV and good G,- 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.
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