First CFOA-based explicit-current-output quadrature sinusoidal oscillators using grounded capacitors |
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Authors: | Abhirup Lahiri Winai Jaikla Montree Siripruchyanun |
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Affiliation: | 1. Division of Electronics and Communications , Netaji Subhas Institute of Technology , 36-B, J and K Pocket, Dilshad Garden, Delhi-110095 , India abhirup.lahiri@nsitlounge.in;3. Department of Engineering Education, Faculty of Industrial Education , King Mongkut's Institute of Technology Ladkrabang , Bangkok, 10520 , Thailand;4. Department of Teacher Training in Electrical Engineering , Faculty of Technical Education, King Mongkut's Unversity of Technology North Bangkok , Bangkok , Thailand |
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Abstract: | To date, no current-feedback operational amplifier (CFOA)-based sinusoidal oscillator has been reported which provides all the following features simultaneously: (i) current-mode quadrature sinusoidal oscillator providing two explicit-current-outputs (ECOs) from high output impedance terminals, (ii) employing no more than three CFOA ICs and six passive components, which include two grounded capacitors, (iii) offers independent tuning of the condition of oscillation (CO) via a resistor and (iv) provides tunability of the ratio of amplitudes of the generated quadrature ECOs via a separate resistor. To the best of authors' knowledge, this article reports first CFOA-based QOs in current-mode (i.e. providing two ECO signals). Experimental results using AD844 CFOA ICs from Analog Devices have been included to verify the workability of the proposed oscillator circuits. An example automatic gain control (AGC) loop to regulate the oscillation amplitude and control the THD has also been used and verified using SPICE simulations using the AD844 macro-model. |
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Keywords: | quadrature sinusoidal oscillator current-mode explicit-current-output current-feedback op-amp |
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