MO-CTTA-based Electronically Controlled Current- mode Square/Triangular Wave Generator

A new current-mode square/triangular wave generator based on MO-CTTAs (Multiple output current through transconductance amplifiers) is presented in this paper. The circuit description is very simple, its construction consists of 2 MO-CTTAs and 1 grounded capacitor without any external resistor. The output frequency and amplitude can be independently and electronically adjusted. With mentioned features, it is very suitable to realize in a monolithic chip. The PSPICE simulation results are depicted, and agree well with the theoretical anticipation. The maximum power consumption is approximately 3.27mW at ±1.5V power supply.

[1]  H.T. Russell,et al.  Design of Sinusoidal, Triangular, and Square wave Generator Using Current Feedback Operational Amplifier (CFOA) , 2008, 2008 IEEE Region 5 Conference.

[2]  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..

[3]  Montree Siripruchyanun,et al.  Temperature-Insensitive and Electronically Adjustable Square/Triangular Wave Generation based on Schmitt Trigger Oscillator , 2002 .

[4]  Yu-Kang Lo,et al.  Squarewave generators employing OTRAs , 2005 .

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

[6]  B Almashary,et al.  Current-mode triangular wave generator using CCIIs , 2000 .

[7]  Branko D. Rakovich,et al.  A New Transistor Square-Wave Generator Using Two Regenerative Switches , 1968 .

[8]  G. Ferri,et al.  Low voltage integrated astable multivibrator based on a single CCII , 2007, 2007 Ph.D Research in Microelectronics and Electronics Conference.

[9]  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).

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

[11]  Montree Siripruchyanun,et al.  A simple current-mode Schmitt trigger employing only single MO-CTTA , 2009, 2009 6th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology.

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

[13]  Dalibor Biolek,et al.  Current-Mode CDTA-Based Comparators , 2006 .

[14]  R. Sengupta.  A widely linear temperature to frequency converter using a thermistor in a pulse generator , 1988 .

[15]  Avireni Srinivasulu,et al.  Current Conveyor-Based Square/Triangular Waveform Generators With Improved Linearity , 2009, IEEE Transactions on Instrumentation and Measurement.