A Simple Current-mode PWM Signal Generator Employing Only Single Active Element

This article presents a new current-mode PWM signal generator based on MO-CCCDTA (Multiple output current controlled current differencing transconductance amplifier). The circuit description is very simple, its construction consists of 1 MO-CCCDTA, 1 grounded resistor and 1 grounded capacitor. The output oscillation frequency and amplitude of can be independently/electronically adjusted. With mentioned features, it is very suitable to realize in monolithic chip. The PSPICE simulation results are depicted, and agree well with the theoretical anticipation. The maximum power consumption is approximately 733μW at ±1.5V supply voltages.

[1]  Dragan Maksimovic,et al.  A unified analysis of PWM converters in discontinuous modes , 1991 .

[2]  Wolfgang Mathis.  Nonlinear systems and communications systems , 2001, 5th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service. TELSIKS 2001. Proceedings of Papers (Cat. No.01EX517).

[3]  D. R. Frey,et al.  Log-domain filtering: An approach to current-mode fil-tering , 1993 .

[4]  Jerald G. Graeme,et al.  Applications of operational amplifiers. Third-generation techniques , 1973 .

[5]  Christofer Toumazou,et al.  Analogue IC design : the current-mode approach , 1993 .

[6]  V. K. Sharma,et al.  New current-mode universal biquad filter , 1999 .

[7]  Montree Siripruchyanun,et al.  A simple pulse width modulator using current conveyor , 2000, 2000 TENCON Proceedings. Intelligent Systems and Technologies for the New Millennium (Cat. No.00CH37119).

[8]  Hoon Kim,et al.  Pulsewidth Modulation Circuits Using CMOS OTAs , 2006, IEEE Transactions on Circuits and Systems I: Regular Papers.

[9]  Varakorn Kasemsuwan,et al.  High performance CMOS current-mode precision full-wave rectifier (PFWR) , 2003, Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03..

[10]  Martin S. Roden.  Analog and Digital Communication Systems , 1979 .

[11]  H. Schmid.  Why the terms 'current mode' and 'voltage mode' neither divide nor qualify circuits , 2002, 2002 IEEE International Symposium on Circuits and Systems. Proceedings (Cat. No.02CH37353).