Two Simple Analog Multiplier Based Linear VCOs Using a Single Current Feedback Op-Amp

ABSTRACT

Two simple voltage-controlled-oscillators (VCO) with linear tuning laws employing only a single current feedback operational amplifier (CFOA) in conjunction with two analog multipliers (AM) have been highlighted. The workability of the presented VCOs has been demonstrated by experimental results based upon AD844 type CFOAs and AD534 type AMs.

Two simple voltage-controlled-oscillators (VCO) with linear tuning laws employing only a single current feedback operational amplifier (CFOA) in conjunction with two analog multipliers (AM) have been highlighted. The workability of the presented VCOs has been demonstrated by experimental results based upon AD844 type CFOAs and AD534 type AMs.

KEYWORDS

Voltage-Controlled Oscillators, Current Feedback Op-Amps, Current-Mode Circuits, Analog Multipliers

Voltage-Controlled Oscillators, Current Feedback Op-Amps, Current-Mode Circuits, Analog Multipliers

Cite this paper

nullD. Ram Bhaskar, R. Senani, A. Kumar Singh and S. Gupta, "Two Simple Analog Multiplier Based Linear VCOs Using a Single Current Feedback Op-Amp,"*Circuits and Systems*, Vol. 1 No. 1, 2010, pp. 1-4. doi: 10.4236/cs.2010.11001.

nullD. Ram Bhaskar, R. Senani, A. Kumar Singh and S. Gupta, "Two Simple Analog Multiplier Based Linear VCOs Using a Single Current Feedback Op-Amp,"

References

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[2] A. Toker, O. Cicekoglu and H. Kuntman, “On the Oscillator Implementations Using a Single Current Feedfack Op-Amp,” Computers & Electrical Engineering, Vol. 28, No. 5, 2002, pp. 375-389.

[3] A. M. Soliman and A. S. Elwakil, “Wien Oscillators Using Current Conveyors,” Computers & Electrical Engineering, Vol. 25, No. 1, 1999, pp. 45-55.

[4] C. Toumazou and F. G. Lidgey, “Current Feedback Op-Amps: A Blessing in Disguise?” IEEE Circuits Devices Magazine, Vol. 10, No. 1, 1994, pp. 34-37.

[5] F. J. Lidgey and K. Hayatleh, “Current-Feedback Operational Amplifiers and Applications,” Electronics and Communication Engineering Journal, Vol. 9, No. 4, 1997, pp. 176-182.

[6] R. Senani, “Realization of a Class of Analog Signal Processing/Signal Generation Circuits: Novel Configurations Using Current Feedback Op-Amps,” Frequenz, Vol. 52, No. 9-10, 1998, pp. 196-206.

[7] A. M. Soliman, “Applications of the Current Feedback Amplifier,” Analog Integrated Circuits and Signal Processing, Vol. 11, No. 3, 1996, pp. 265-302.

[8] R. Senani and S. S. Gupta, “Synthesis of Single-Resistance- Controlled Oscillators Using CFOAs: Simple State-Variable Approach,” IEE Proceedings on Circuits, Devices and Systems, Vol. 144, No. 2, 1997, pp. 104-106.

[9] S. S. Gupta and R. Senani, “State Variable Synthesis of Single of Single-Resistance-Controlled Grounded Capacitor Oscillators Using only two CFOAs: Additional New Realizations,” IEE Proceedings on Circuits, Devices and Systems, Vol. 145, No. 6, 1998, pp. 415-418.

[10] A. M. Soliman, “Current-Feedback Operational Amplifier Based Oscillators,” Analog Integrated Circuits and Signal Processing, Vol. 23, No. 1, 2000, pp. 45-55.

[11] D. R. Bhaskar and R. Senani, “New CFOA-Based Single-Element-Controlled Sinusoidal Oscillators,” IEEE Transactions on Instrumentation and Measurement, Vol. 55, No. 6, 2006, pp. 2014-2021.

[12] R. Senani, D. R. Bhaskar and M. P. Tripathi, “On the Realization of Linear Sinusoidal VCOs,” International Journal of Electronics, Vol. 74, No. 5, 1993, pp. 727-733.

[13] R. Senani and D. R. Bhaskar, “New Active-R Sinusoidal VCOs with Linear Tuning Laws,” International Journal of Electronics, Vol. 80, No. 1, 1996, pp. 57-61.

[14] D. R. Bhaskar and M. P. Tripathi, “Realization of Novel Linear Sinusoidal VCOs,” Analog Integrated Circuits and Signal Processing, Vol. 24, No. 3, 2000, pp. 263-267.

[15] S. K. Saha, “Linear VCO with Sine Wave Output,” IEEE Transactions on Instrumentation and Measurement, Vol. 35, No. 2, 1986, pp. 152-155.

[16] S. K. Saha and L. C. Jain, “Linear Voltage Controlled Oscillator,” IEEE Transactions on Instrumentation and Measurement, Vol. 37, No. 1, 1988, pp. 148-150.

[17] V. P. Singh and S. K. Saha, “Linear Sinusoidal VCO,” International Journal of Electronics, Vol. 65, No. 2, 1988, pp. 243-247.

[18] D. R. Bhaskar, R. Senani and A. K. Singh, “Linear Sinusoidal VCOs: New Configurations Using Current Feedback Op-Amps,” International Journal of Electronics, Vol. 97, No. 3, 2010, pp. 263-272.

[1] J. W. Horng, “Current Conveyors Based All Pass Filters and Quadrature Oscillators Employing Grounded Capacitors and Resistors,” Computers & Electrical Engineering, Vol. 31, No. 1, 2005, pp. 81-92.

[2] A. Toker, O. Cicekoglu and H. Kuntman, “On the Oscillator Implementations Using a Single Current Feedfack Op-Amp,” Computers & Electrical Engineering, Vol. 28, No. 5, 2002, pp. 375-389.

[3] A. M. Soliman and A. S. Elwakil, “Wien Oscillators Using Current Conveyors,” Computers & Electrical Engineering, Vol. 25, No. 1, 1999, pp. 45-55.

[4] C. Toumazou and F. G. Lidgey, “Current Feedback Op-Amps: A Blessing in Disguise?” IEEE Circuits Devices Magazine, Vol. 10, No. 1, 1994, pp. 34-37.

[5] F. J. Lidgey and K. Hayatleh, “Current-Feedback Operational Amplifiers and Applications,” Electronics and Communication Engineering Journal, Vol. 9, No. 4, 1997, pp. 176-182.

[6] R. Senani, “Realization of a Class of Analog Signal Processing/Signal Generation Circuits: Novel Configurations Using Current Feedback Op-Amps,” Frequenz, Vol. 52, No. 9-10, 1998, pp. 196-206.

[7] A. M. Soliman, “Applications of the Current Feedback Amplifier,” Analog Integrated Circuits and Signal Processing, Vol. 11, No. 3, 1996, pp. 265-302.

[8] R. Senani and S. S. Gupta, “Synthesis of Single-Resistance- Controlled Oscillators Using CFOAs: Simple State-Variable Approach,” IEE Proceedings on Circuits, Devices and Systems, Vol. 144, No. 2, 1997, pp. 104-106.

[9] S. S. Gupta and R. Senani, “State Variable Synthesis of Single of Single-Resistance-Controlled Grounded Capacitor Oscillators Using only two CFOAs: Additional New Realizations,” IEE Proceedings on Circuits, Devices and Systems, Vol. 145, No. 6, 1998, pp. 415-418.

[10] A. M. Soliman, “Current-Feedback Operational Amplifier Based Oscillators,” Analog Integrated Circuits and Signal Processing, Vol. 23, No. 1, 2000, pp. 45-55.

[11] D. R. Bhaskar and R. Senani, “New CFOA-Based Single-Element-Controlled Sinusoidal Oscillators,” IEEE Transactions on Instrumentation and Measurement, Vol. 55, No. 6, 2006, pp. 2014-2021.

[12] R. Senani, D. R. Bhaskar and M. P. Tripathi, “On the Realization of Linear Sinusoidal VCOs,” International Journal of Electronics, Vol. 74, No. 5, 1993, pp. 727-733.

[13] R. Senani and D. R. Bhaskar, “New Active-R Sinusoidal VCOs with Linear Tuning Laws,” International Journal of Electronics, Vol. 80, No. 1, 1996, pp. 57-61.

[14] D. R. Bhaskar and M. P. Tripathi, “Realization of Novel Linear Sinusoidal VCOs,” Analog Integrated Circuits and Signal Processing, Vol. 24, No. 3, 2000, pp. 263-267.

[15] S. K. Saha, “Linear VCO with Sine Wave Output,” IEEE Transactions on Instrumentation and Measurement, Vol. 35, No. 2, 1986, pp. 152-155.

[16] S. K. Saha and L. C. Jain, “Linear Voltage Controlled Oscillator,” IEEE Transactions on Instrumentation and Measurement, Vol. 37, No. 1, 1988, pp. 148-150.

[17] V. P. Singh and S. K. Saha, “Linear Sinusoidal VCO,” International Journal of Electronics, Vol. 65, No. 2, 1988, pp. 243-247.

[18] D. R. Bhaskar, R. Senani and A. K. Singh, “Linear Sinusoidal VCOs: New Configurations Using Current Feedback Op-Amps,” International Journal of Electronics, Vol. 97, No. 3, 2010, pp. 263-272.