A new configuration of Bulk-Driven Folded-Cascode (BDFC) amplifier is presented in this paper. Due to this modifying, significant improvement in differential DC-Gain (more than 11 dB) is achieved in compare to the conventional structure. Settling behavior of proposed amplifier is also improved and accuracy more than 8 bit for 500 mV voltage swing is obtained. Simulation results using HSPICE Environment are included which validate the theoretical analysis. The amplifier is designed using standard 0.18 μm CMOS triple-well (level 49) process with supply voltage of 1.2 V. The correct functionality of this configuration is verified from –50℃ to 100℃.
References
[1]
S. Chatterjee, Y. Tsvidis and P. Kinget, “Ultra-Low Voltage Analog Integrated Circuits,” IEICE Transactions on Electronics, Vol. E89-C, No. 6, 2006, pp. 673-680.
[2]
S. Yan and E. Sanchez-Sinencio, “Low-Voltage Analog Circuit Design Techniques: A Tutorial,” IEICE Transactions, Vol. E00-A, No. 2, 2000, pp. 179-196.
[3]
J. Ramirez-Angulo, R. G Carvajal and A. Torralba, “Low Supply Voltage High Performance CMOS Current Mirror with Low Input and Output Voltage Requirements,” IEEE Transactions on Circuits and Systems-II Express Briefs, Vol. 51, No. 3, 2004, pp. 124-129.
doi:10.1109/TCSII.2003.822429
[4]
ITRS, “The International Technology Roadmap for Semconductors,” 2008. http://public.itrs.net
[5]
B. Razavi, “Design of Analog CMOS Integrated Circuits,” McGraw Hill, New York, 2001.
[6]
P. R. Gray, P. J. Hurst, S. H. Lewis and R. G. Meyer, “Analysis and Design of Analog Integrated Circuits,” 4th Edition, John Wiley & Sons, New York, 2001.
[7]
S. M. R. Hasan and N. Ula, “A Novel Feed-Forward Compensation Technique for Single-Stage Fully-Differential CMOS Folded-Cascode Rail-to-Rail Amplifier,” Electrical Engineering, Vol. 88, No. 6, 2006, pp. 509-517.
doi:10.1007/s00202-005-0306-2
[8]
B. Alizadeh and A. Dadashi, “An Enhanced Folded-Cascode Op-Amp in 0.18 μm CMOS Process with 67 dB DC-Gain,” IEEE International Conference, Faible Tension Faible Consummation, 30 May-1 June 2011, pp. 87-90.
[9]
J. Rosenfeld, M. Kozak and E. G. Friedman “A BulkDriven CMOS OTA with 68-dB DC-Gain,” Proceedings of IEEE International Electronics Circuits Systems, TelAviv, 13-15 December 2004, pp. 5-8.
[10]
M. Trakimas and S. Sonkusale, “A 0.5 V Bulk-Input OTA with Improved Common-Mode Feedback for Low-Frequency Filtering Applications,” Analog Integrated Circuits and Signal Processing, April 2009, Vol. 59, No. 1, pp. 83-89. doi:10.1007/s10470-008-9236-z
[11]
R. Assaad and J. Silva-Martinez, “Enhancing General Performance of Folded-Cascode Amplifier by Recycling Current,” Electronics Letters, Vol. 43, No. 23, 2007, pp. 1243-1244. doi:10.1049/el:20072031
