Narongsak MANOSITTHICHAI, Fabian KHATE, Pipat PROMMEE

Active-only variable-gain low-pass lter for dual-mode multiphase sinusoidal oscillator application

This research presents an active-only low-pass (LP) lter whose pole frequency and gain are independently tunable by means of bias current manipulation. The realization of the proposed LP lter required one operational ampli er, two operational transconductance ampli ers, and two MOS transistors. The multiphase sinusoidal oscillator (MSO) was subsequently realized by cascading n LP lters ( n = 3) and loop-backing the output of the last LP lter to the input of the rst LP lter. Simulations were carried out and the results revealed that the MSO could simultaneously achieve low impedance voltage and high impedance current outputs without the circuit topology alteration. The frequency of oscillation and the condition of oscillation could also be electronically tuned without disturbing each other. Furthermore, the sinusoidal signal of the MSO exhibited relatively low total harmonic distortion of about 0.8% at 2.75 MHz. To verify, a prototype of the active-only LP-based MSO ( n = 3) was constructed and experiments were performed. The experimental ndings were agreeable with the simulation results.

PDF

___

[1] Sanchez-Sinencio E, Geiger RL, Nevarez-Lozano H. Generation of continuous-time two integrator loop OTA lter structures. IEEE T Circuits Syst 1988; 35: 936-946.
[2] Huelsman LP. Active and Analog Filter Design. New York, NY, USA: McGraw-Hill, 1993.
[3] Ananda Mohan PV. Current-Mode VLSI Analog Filters: Design and Applications. Basel, Switzerland: Birkhauser, 2003.
[4] Soliman AM. Current conveyor lters: classi cation and review. Microelectron J 1998; 29: 133-149.
[5] Soliman AM. Current mode CCII oscillators using grounded capacitors and resistors. Int J Circuit Theory Appl 1998; 26: 431-438.
[6] Prommee P, Pattanatadapong T. Realization of tunable pole-Q current-mode OTA-C universal lter. Circ Syst Signal Pr 2010; 29: 913-924.
[7] Prommee P, Somdunyakanok M. CMOS-based current-controlled DDCC and its applications to capacitance multi- plier and universal lter. AEU-Int J Electron Commun 2011; 65: 1-8.
[8] Tsukutani T, Ishida M, Tsuiki S, Fukui Y. Current-mode biquad without passive elements. Electron Lett 1996; 32: 197-198.
[9] Tsukutani T, Higashimura M, Sumi Y, Fukui Y. Voltage mode active only biquad. Int J Electron 2000; 87: 1435- 1442.
[10] Tsukutani T, Sumi Y, Kinugasa Y, Higashimura M, Fukui Y. Versatile active-only biquad circuits with loss-less and lossy integrators. Int J Electron 2004; 91: 525-536.
[11] Abuelmaatti MT, Almansoury WA. New active-R sinusoidal oscillator. Int J Electron 1986; 60: 771-775.
[12] Sanyal S K, Sarker UC, Nandi R. A programmable active-R sine wave oscillator with microprocessor control. IEEE T Instrum Meas 1989; 38: 925-927.
[13] Abuelma'atti MT, Alzaher HA. Active-only sinusoidal oscillator. Microelectron J 1998; 29: 461-464.
[14] Tomasi W. Electronic Communications Systems. Upper Saddle River, NJ, USA: Prentice Hall, 1988.
[15] Prommee P, Sra-ium N, Dejhan K. High-frequency log-domain current-mode multiphase sinusoidal oscillator. IET Circ Device Syst 2010; 4: 440-448.
[16] Minaei S, Cicekoglu O. New current-mode integrator, all-pass section and quadrature oscillator using only active elements. In: Proceedings of the 1st IEEE International Conference on Circuits and Systems for Communications; 2002; St. Petersburg, Russia. New York, NY, USA: IEEE. pp. 70-73.
[17] Prommee P, Somdunyakanok M, Dejhan K. Universal lter and its oscillator modi cation employing only active components. In: Proceedings of the International Symposium on Intelligent Signal Processing and Communication Systems; 2008; Bangkok, Thailand.
[18] Wu D, Liu S, Hwang Y, Wu Y. Multiphase sinusoidal oscillator using second-generation current conveyors. Int J Electron 1995; 78: 645-651.
[19] Abuelma'atti MT, Al-Qahtani MA. A new current controlled multiphase sinusoidal oscillator using translinear current conveyors. IEEE T Circuits-II 1998; 45: 881-885.
[20] Gift SJG. Multiphase sinusoidal oscillator using inverting-mode operational ampli ers. IEEE T Instrum Meas 1998; 47: 986-991.
[21] Tangsrirat W, Tancharoen W. Current-mode multiphase sinusoidal oscillator using current differencing transcon- ductance ampli ers. Circ Syst Signal Pr 2008; 27: 81-93.
[22] Souliotis G, Psychalinos C. Electronically controlled multiphase sinusoidal oscillators using current ampli ers. Int J Circuit Theory Appl 2009; 37: 43-52.
[23] Prommee P, Dejhan K. An integrable electronic controlled quadrature sinusoidal oscillator using CMOS operational transconductance ampli er. Int J Electron 2002; 89: 365-379.
[24] Uttaphut P. New current-mode multiphase sinusoidal oscillators based on CCCCTA-based lossy integrators. Prz Elektrotechniczn 2012; 88: 291-295.
[25] Sagbas M, Ayten EU, Herencsar N, Minaei S. Current- and voltage-mode multiphase sinusoidal oscillators using CBTAs. Radioengineering 2013; 22: 24-33.
[26] Jaikla W, Prommee P. Electronically tunable current-mode multiphase sinusoidal oscillator employing CCCDTA- based all pass lters with only grounded passive elements. Radioengineering 2011; 20: 594-599.
[27] Ayten EU, Sagbas M, and Minaei S. Realization of low-voltage modi ed CBTA and design of cascadable current- mode all-pass lter. Radioengineering 2014; 23: 523-531.
[28] Jantakun A, Jaikla W. Active-only current-mode rst-order all pass lter and its application in quadrature oscillator. Indian J Pure Appl Phys 2015; 53: 557-563.
[29] Wang Z. 2-MOSFET tranresistor with extremely low distortion for output reaching supply voltage. Electron Lett 1990; 26: 951-952.
[30] Allen PE, Holberg DR. CMOS Analog Circuit Design. 3rd ed. Oxford, UK: Oxford University Press, 2012.