CCII+ based dual square-and-triangular waveform generator

This paper presents a novel topology of CCII+ based dual square-and-triangular waveform generator using 3-current conveyors and 5-passive elements, including 2-grounded resistors. The dual square waveform can be used in testing PLL as also in other applications in instrumentation. Simulation using CCII+ and discrete passive components show excellent linearity and tunability both by the resistor and capacitor over the bandwidth of interest (from 5 Hz to 200 kHz). Component sensitivity and temperature sensitivity (over −150° C to +150° C) is next studied. Finally an experimental verification of the proposed design has been tried by realizing the circuit with commercially available CFOA (AD 844 AN) which is next best after ASIC-fabrication. The experimental results are in agreement with the analyses. The topology presents a versatile building block for applications in design of sweep generators for instrumentation, mathematical function generators, and in testing units for ADCs. The design is suitable for ASIC implementation.

[1]  M. M. Bani Amer.  A novel differential integrator for bioelectric events , 2002 .

[2]  Wei-Yen Wang,et al.  Discrete modelling of uncertain continuous systems having an interval structure using higher-order integrators , 2000, Int. J. Syst. Sci..

[3]  Jirayuth Mahattanakul,et al.  DC stable CCII-based instantaneous companding integrator , 1997, Proceedings of 1997 IEEE International Symposium on Circuits and Systems. Circuits and Systems in the Information Age ISCAS '97.

[4]  Rabindranath Nandi,et al.  Precise frequency compensation of tunable active-RC integrator , 1991 .

[5]  R.G. Bozomitu,et al.  New linearized current mode lossy integrators in bipolar technology , 2003, Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on.

[6]  Salil Kumar Sanyal,et al.  Increased time-constant dual-input integrators , 1990 .

[7]  Hen-Wai Tsao,et al.  True RC integrators based on current conveyors with tunable time constants using active control and modified loop technique , 1992 .

[8]  E. Sanchez-Sinencio,et al.  A low mismatch sensitivity fully-balanced current-mode integrator , 1998, ISCAS '98. Proceedings of the 1998 IEEE International Symposium on Circuits and Systems (Cat. No.98CH36187).

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

[10]  Shahram Minaei,et al.  Active only integrator and differentiator with tunable time constants , 2003 .

[11]  A. Sedra.  Microelectronic circuits , 1982 .

[12]  B. Wilson,et al.  Recent developments in current conveyors and current-mode circuits , 1990 .

[13]  Palaniandavar Venkateswaran,et al.  Voltage controlled integrators/differentiators using current feedback amplifier , 2003, Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on.

[14]  F.A.S. Soliman,et al.  Analysis of CMOS current conveyor , 1998, Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109).

[15]  Muhammad Al-Shahrani,et al.  New CFOA-based triangular/square wave generator , 1998 .

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

[17]  Munir Ahmad Al-Absi,et al.  A current conveyor-based relaxation oscillator as a versatile electronic interface for capacitive and resistive sensors , 2005 .

[18]  George A. Constantinides,et al.  Active filter synthesis based on tuneable log-domain lossy integrators , 2000, 2000 IEEE International Symposium on Circuits and Systems. Emerging Technologies for the 21st Century. Proceedings (IEEE Cat No.00CH36353).

[19]  A.M. Davis,et al.  Microelectronic circuits , 1983, Proceedings of the IEEE.

[20]  Shen-Iuan Liu,et al.  Integrator and differentiator with time constant multiplication using current feedback amplifier , 2001 .

[21]  D. Patranabis,et al.  Integrators and differentiators with current conveyors , 1984 .

[22]  David J. Allstot,et al.  A continuous-time current-mode integrator , 1991 .

[23]  Stylianos Siskos,et al.  Design and applications of an easily integrable CMOS operational floating amplifier for the MegaHertz range , 1995 .

[24]  Emmanuel M. Drakakis,et al.  A Practical CMOS Companding Sinh Lossy Integrator , 2007, 2007 IEEE International Symposium on Circuits and Systems.

[25]  Gaetano Palumbo,et al.  A schmitt trigger by means of a ccii+ , 1995, Int. J. Circuit Theory Appl..

[26]  W.-S. Chung,et al.  Temperature-stable VCO based on operational transconductance amplifiers , 1990 .

[27]  D. Patranabis,et al.  True RC integrators with very large and very small time constants using active control of capacitance and/or resistance , 1988 .

[28]  Yasuaki Sumi,et al.  Versatile voltage-mode active-only biquad with lossless and lossy integrator loop , 2001 .

[29]  Hakan Kuntman,et al.  On the design of CCII+ based relaxation oscillator employing single grounded passive element for linear period control , 1998 .

[30]  K. Smith,et al.  A second-generation current conveyor and its applications , 1970, IEEE Transactions on Circuit Theory.

[31]  T. Pukkalanun.  Electronically Tunable Active-only Current-mode Integrator and Its Applications , 2005, 2005 IEEE Conference on Electron Devices and Solid-State Circuits.

[32]  Christian Enz,et al.  A 1.2 V companding current-mode integrator for standard digital CMOS processes , 1996, Proceedings of Third International Conference on Electronics, Circuits, and Systems.