A 0.5V, 900uW CMOS OTA Using Bulk Driven and Hybrid Compensation Technique

Subject Areas : Majlesi Journal of Telecommunication Devices

Seyedeh Sara Hassani ¹ (Department of Electrical Engineering, Sadjad Institute for Higher Education, Mashhad, Iran)
Abbas Golmakani ² (Department of Electrical Engineering, Sadjad Institute for Higher Education, Mashhad, Iran)

Received: 2014-02-26 Accepted : 2014-02-26 Published : 2014-06-01

Keywords: en,

Abstract :

Abstract— An ultra-low-voltage ultra-low-power operational transconductance amplifier (OTA) is presented in this paper. The proposed topology based on a bulk driven input differential pair. Two separate capacitors have been used for compensation of the opamp where one of them is used in a signal path and another one in a non-signal path. The circuit is designed in the 0.18µm CMOS technology. The simulation results show that the amplifier has a 84.1dB open-loop DC gain and a unity gain-bandwidth of 81 KHz while operating at 0.5V supply voltage. The total power consumption is as low as 900nW which makes it suitable for low-power bio-medical applications.

References:

[1] E.Kargaran, M.Sawan, Kh.Mafinezhad, H.Nabovati,” Design of 0.4V,386nW OTA Using DTMOS Technique for Biomedical Applications,” in the proceeding of IEEE 55th International Midwest Symposium on Circuits and Systems (MWSCAS),USA, 2012.

[2] P. E., Allen , D. R., Holberg, “CMOS Analog Circuits Design”, 2nd ed. Oxford, U.K.: Oxford Univ. Press, 2002.

[3] E. A., Vittoz , J., Fellrath, “CMOS analog integrated circuits based on weak inversion operation,” IEEE J. Solid-State Circuits, Vol. SC-12, No. 3, pp. 231–244, Jun. 1977.

[4] L.H.C., Ferreira , T. C., Pimenta, “Extraction of MOS parameters from BSIM3v3 model using minimum square method for quick manual design,” Proc. IEE Circuits, Devices Syst., Vol. 153, No. 2, pp. 153–158, Apr. 2006.

[5] Luis H. C., Ferreira, T. C., Pimenta and R. L., Moreno, “An ultra-low voltage ultra-low-power CMOS Miller OTA with rail-to-rail input/output swing,” IEEE Trans. Circuits Syst. II, Exp. Briefs, Vol. 54, No. 10, pp. 843-847, Oct. 2007.

[6] T., Stockstad , H., Yoshizawa, “A 0.9 V 0.5 μA rail-to-rail CMOS operational amplifier,” IEEE J. Solid-State Circuits, Vol. 37, No. 3, pp 286–292, Mar. 2002.

[7] Sh., Wen Pan et al,” A Novel OTA with Dual Bulk-Driven Input St.age,” in proc. IEEE International Symposium on Circuits and Systems, pp.2721-2724, 2009.

[8] M., Yavari ,” Hybrid Cascode Compensation for Two Stage CMOS OPAMPs,” IEICE Trans.Electron, Vol.88, No.6, June 2005.

[9] A. G. Sabnis , J. T. Clemens, “Characterization of the electron mobility in the inverted h100i Si surface,” in IEDM Tech. Dig., pp. 18–21 Dec. 1979.

[10] “MCP604x Datasheet,” Microchip Semiconductor, Chandler, AZ, Jan. 2007 [Online]. Available: http://www.microchip.com.