An electronically controllable fully uncoupled explicit current-mode quadrature oscillator employing Voltage Differencing Transconductance Amplifiers (VDTAs) as active elements has been presented. The proposed configuration employs two VDTAs along with grounded capacitors and offers the following advantageous features 1) fully and electronically independent control of condition of oscillation (CO) and frequency of oscillation (FO);2) explicit current-mode quadrature oscillations; and 3) low active and passive sensitivities. The workability of proposed configuration has been demonstrated by PSPICE simulations with TSMC CMOS 0.18μm process parameters.
Cite this paper
D. Prasad, M. Srivastava and D. Bhaskar, "Electronically Controllable Fully-Uncoupled Explicit Current-Mode Quadrature Oscillator Using VDTAs and Grounded Capacitors," Circuits and Systems, Vol. 4 No. 2, 2013, pp. 169-172. doi: 10.4236/cs.2013.42023.
 J. W. Horng, “Current Conveyors Based Allpass Filters and Quadrature Oscillators Employing Grounded Capaci tors and Resistors,” Computer and Electrical Engineering, Vol. 31, No. 1, 2005, pp. 81-92.
 D. Prasad, D. R. Bhaskar and A. K. Singh, “Electronically Controllable Grounded Capacitor Current-Mode Quadrature Oscillator Using Single MO-CCCDTA,” Radioengi neering, Vol. 20, No. 1, 2011, pp. 354-359.
 W. Tangsrirat and W. Tanjaroen, “Current-Mode Sinusoidal Oscillator with Independent Control of Oscillation Frequency and Condition Using CDTAs,” Indian Journal of Pure and Applied Physics, Vol. 48, No. 5, 2010, pp. 363-366.
 M. T. Abuelmatti, “New OTA-Based Sinusoidal Oscillators with Fully Uncoupled Control of Oscillation Frequency and Condition,” Frequenz: Journal of RF-Engi neering and Telecommunications, Vol. 55, No. 7-8, 2001, pp. 224-228.
 M. T. Abuelmatti, “Active-Only Sinusoidal Oscillator with Electronically-Tunable Fully-Uncoupled Frequency and Condition of Oscillation,” Active and Passive Electronic Components, Vol. 24, No. 4, 2001, pp. 233-241.
 M. T. Abuelmatti and H. A. Al-Zaher, “Current Mode Quadrature Sinusoidal Oscillators Using Two FTFNs,” Frequenz: Journal of RF-Engineering and Telecommunications, Vol. 53, No. 1-2, 1999, pp. 27-30.
 W. Tangsrirat and S. Pisitchalermpong, “CDBA-Based Quadrature Sinusoidal Oscillator,” Frequenz: Journal of RF-Engineering and Telecommunication, Vol. 61, No. 3 4, 2007, pp. 102-104.
 W. Tangsrirat, D. Prasertsoma, T. Piyatata and W. Sura kampontorn, “Single-Resistance-Controlled Quadrature Os cillator Using Current Differencing Buffered Amplifiers,” International Journal of Electronics, Vol. 95, No. 11, 2008, pp. 1119-1126. doi:10.1080/00207210802387676
 M. Kumngern and K. Dejhan, “DDCC-Based Quadrature Oscillator with Grounded Capacitors and Resistors,” Journal of Active and Passive Electronic Component, 2009, Article ID: 987304.
 A. Lahiri, “Current Mode Variable Frequency Quadrature Oscillator Using Two CCs and Four Passive Component Including Grounded Capacitors,” Analog Integrated Circuits and Signal Processing, Vol. 68, No. 1, 2011, pp. 129-131. doi:10.1007/s10470-011-9635-4
 M. T. Abuelmatti, “New Sinusoidal Oscillators with Fully Uncoupled Control of Oscillation Frequency and Condition Using Three CCII+s,” Analog Integrated Circuits and Signal Processing, Vol. 24, No. 3, 2000, pp. 253-261.
 A. Yesil, F. Kacar and H. Kuntman, “New Simple CMOS Realization of Voltage Differencing Transconductance Amplifier and Its RF Filter Application,” Radioengineering, Vol. 20, No. 3, 2011, pp. 632-637.
 D. Prasad and D. R. Bhaskar, “Electronically-Controllable Explicit Current Output Sinusoidal Oscillator Employing Single VDTA,” ISRN Electronics, Vol. 2012, 2012, Article ID: 382560. doi:10.5402/2012/382560
 J. Satansup, T. Pukkalanun and W. Tangsrirat, “Electronically Tunable Single-Input Five-Output Voltage-Mode Universal Filter Using VDTAs and Grounded Passive Elements,” Circuits, Systems and Signal Processing, 2012.