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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29526

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Design of CMOS CFOA Based on Pseudo Operational Transconductance Amplifier
A novel design technique employing CMOS Current Feedback Operational Amplifier (CFOA) is presented. The feature of consumption very low power in designing pseudo-OTA is used to decreasing the total power consumption of the proposed CFOA. This design approach applies pseudo-OTA as input stage cascaded with buffer stage. Moreover, the DC input offset voltage and harmonic distortion (HD) of the proposed CFOA are very low values compared with the conventional CMOS CFOA due to the symmetrical input stage. P-Spice simulation results are obtained using 0.18μm MIETEC CMOS process parameters and supply voltage of ±1.2V, 50μA biasing current. The p-spice simulation shows excellent improvement of the proposed CFOA over existing CMOS CFOA. Some of these performance parameters, for example, are DC gain of 62. dB, openloop gain bandwidth product of 108 MHz, slew rate (SR+) of +71.2V/μS, THD of -63dB and DC consumption power (PC) of 2mW.
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[1] Ahmed H. Madian, Soliman A. Mahmoud, and Ahmed M. Soliman, "New 1.5-V CMOS Current Feedback Operational Amplifier", IEEE, 2006, pp. 600-603.
[2] Salvatore Pennisi, "High-Performance CMOS Current Feedback Operational Amplifier", IEEE Journal, 2005, pp. 1573- 1576.
[3] Hio Leong Chao and Dongsheng Ma, "CMOS Variable-Gain Wide- Bandwidth CMFB-Free Differential Current Feedback Amplifier for Ultrasound Diagnostic Applications", IEEE Journal, 2006, pp. 649-652,
[4] G. Giustolisi, G. Palmisano, G. Palumbo and S.Pennisi, "High-Drive CMOS Current-Feedback Opamp", IEEE Journal, 1997, pp. 229-232
[5] Jirayuth Mahattanakul and Chris Toumazou, "A Theoretical Study of the Stability of High-Frequency Current Feedback Op-Amp Integrators", IEEE Transactions on Circuits and Systems, vol. 43, no.1, January 1996, pp. 1-12.
[6] Giuseppe Di Cataldo, Alfio Dario Grasso and Salvatore Pennisi, "Two CMOS Current Feedback Operational Amplifiers", IEEE Transactions on Circuits and Systems, 2007, pp. 1-5.
[7] Ali Assi, Mohamad Sawan, and Jieyan Zhu, "An offset compensated and High- Gain CMOS Current-Feedback Op-Amp", IEEE Transaction on Circuits and Systems, vol. 45, no. 1, January 1998. pp. 85-90.
[8] Aly M. Ismail and Ahmed M. Soliman, "Novel CMOS Current Feedback Op-Amp Realization Suitable for High-Frequency Applications",", IEEE Transaction on Circuits and Systems, vol. 47, no. 6, June 2000, pp. 918-921.
[9] S. Selvanayagam and F. J. Lidgey," Wide Bandwidth CMOS Current Feedback Op Amp for Inverting Applications", IEE Electronics Letters Journal, 1998, pp. 1-4.
[10] Jieyan Zhu, Mohamad Sawan, and Karim Arabi, "An Offset Compensated CMOS Current-Feedback Operational Amplifier", IEEE Journal, 1995, pp. 1552-1555.
[11] G. Palumbo and S. Pennisi, "Current-Feedback Amplifiers versus Voltage Operational Amplifiers", IEEE Transaction on Circuits and Systems, vol. 48, no.5, May 2001. pp. 617-623.
[12] M. Djebbi, A. Assi and M. Sawan, "An Offset-Compensated Wide- Bandwidth CMOS Current-Feedback Operational Amplifier", IEEE Journal, 2003, pp. 73-76.
[13] Soliman A. Mahmoud, Ahmed H. Madian, and Ahmed M. Soliman, "Low- voltage CMOS current Feedback Operational Amplifier and its Applications", pp. 212-218 ETRI Journal, vol. 29, no. 2, April 2007, pp. 655-658.
[14] Ahmed Nader Mohieldin, Edgar Sánchez-Sinencio, and José Silva- Martínez, "Nonlinear Effects in Pseudo-Differential OTAsWith CMFB", IEEE Transactions on Circuits and Systems-II: Analog and Digital Signal Processing, vol. 50, no. 10, October 2003, pp. 762-770.
[15] Phillip E. Allen and Douglas R Holberg, CMOS Analog circuit design, second edition, New York Oxford University Press, 2004.
[16] Hanspeter Schmid, "The Current-Feedback OTA", IEEE Journal, 2001, pp.655-658.
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