|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.47 [2009] >
IJPAP Vol.47(11) [November 2009] >
| Title: | Novel minimum-component universal filter and quadrature oscillator with electronic tuning property based on CCCDBAs |
| Authors: | Tangsrirat, Worapong |
| Keywords: | Current-controlled current differencing buffered amplifier
Voltage-mode circuit
Universal filter
Quadrature oscillator |
| Issue Date: | Nov-2009 |
| Publisher: | CSIR |
| Abstract: | The novel current-tunable
voltage-mode universal biquad filter and sinusoidal
quadrature oscillator using only two current-controlled current differencing
buffered amplifiers (CCCDBAs) and two capacitors without external passive
resistors have been presented. The first proposed filter realizes all the five standard
types of the biquadratic functions and provides independent electronic tuning
of the natural angular frequency (ωo) and the bandwidth
(BW) through an external bias current of the CCCDBA. No critical component
matching conditions are required. The second proposed oscillator generates two sinusoidal output voltages with 90° phase difference. Its oscillation condition and the oscillation
frequency (ωo) are
tunable independently through adjusting the bias current of the CCCDBA. Both the proposed circuit
configurations have a low component count, attractive active and passive
sensitivities and suitability to integrated circuit implementation. PSPICE
simulation results that confirm the theoretical prediction, are also given and
discussed. |
| Page(s): | 815-822 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.47(11) [November 2009]
|
|
