A New Feedforward Technique to Enhance Gain-Bandwidth Product
محورهای موضوعی : Majlesi Journal of Telecommunication DevicesLeila Hatami 1 , Abbas Golmakani 2
1 - Department of Electrical Engineering, Sadjad Institute for Higher Education, Mashhad, Iran
2 - Department of Electrical Engineering, Sadjad Institute for Higher Education, Mashhad, Iran
کلید واژه: en,
چکیده مقاله :
Abstract— In this paper, a new ultra-low-voltage ultra-low-power operational transconductance amplifier (OTA) using feed-forward technique is proposed. The proposed topology is based on a bulk driven input differential pair employs a gain-stage in the Miller capacitor feedback path to improve the pole-splitting effect. In addition, through a coupling capacitance, input signal is simultaneously coupled to gate of idle transistors resulted dramatic enhancement in gain and unity gain-bandwidth (UGB) of the OTA. The circuit is designed in the 0.18µm CMOS technology. The simulation results show that the amplifier has a 90dB open-loop DC gain and a unity gain-bandwidth of 270 kHz while operating at 0.5V supply voltage. This technique show remarkable enhancement in unity gain-bandwidth and also in DC gain compared to the bulk driven input differential pair technique. The total power consumption is as low as 900nW which makes it suitable for low-power bio-medical applications.
[1] Y. Cheng and C. Hu, “MOSFET Modeling & BSIM3 User’s Guide”. Norwell, MA: Kluwer, 1999.
[2] P. E. Allen and D. R. Holberg, “CMOS Analog Circuits Design”, 2nd ,Oxford,Oxford Univ. Press, 2002.
[3] E. A. Vittoz and 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 and 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] 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.
[7] F. Assaderaghi, “DTMOS: Its derivatives and variations, and their potential applications,” in Proc. 12th Int. Conf. Microelectron., 2000, pp. 9–10.
[8] H.F.Achigui, C.J. Fayomi, M, Sawan, “1 V DTMOS Based Class AB Operational Amplifier: Implementation and Experimental Results”, IEEE Journal of Solid-State Circuits, Vol.41, No.11, November 2006, pp. 2440-2448.
[9] M. Maymandi-Nejad and Manoj Sachdev,” DTMOS Technique for Low-Voltage Analog Circuits,” IEEE Transactions on Very Larg Scale Integration (VLSI) Systems Vol. 14, No. 10, October 2006.
[10] A. G. Sabnis and J. T. Clemens, “Characterization of the electron mobility in the inverted h100i Si surface,” in IEDM Tech. Dig., Dec. 1979, pp. 18–21.
[11] M.Razzaghpour, A.Golmakani, “An Ultra-Low-Voltage Ultra-Low-Power OTA with Improved Gain-Bandwidth Product,” in proc. IEEE ICM, 2008.
[12] Sheng-Wen Pan, Chiung-Cheng Chuang, Chung-Huang Yang, Yu-Sheng Lai, “A Novel OTA with Dual Bulk- Driven Input Stage,” IEEE International Symposium on Circuits and Systems, pp. 2721-2724, May 2009.
[13] S. Sbaraini, A. Richelli and Zs.M. Kovacs-Vajna, “EMI susceptibility in bulk-driven Miller opamp,” Electronics Lette Rs , Vol. 46, No. 16, August 2010.
