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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.50 [2012] >
IJPAP Vol.50(08) [August 2012] >
| Title: | Current-mode high-Q bandpass filter and mixed-mode quadrature oscillator using ZC-CFTAs and grounded capacitors |
| Authors: | Tangsrirat, Worapong
Mongkolwai, Pratya
Pukkalanun, Tattaya |
| Keywords: | Z-Copy Current Follower Transconductance Amplifier
Bandpass filter
Quadrature oscillator |
| Issue Date: | Aug-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | This paper presents the realization of the
current-mode bandpass filter and mixed-mode quadrature oscillator both from the
same circuit configuration. The proposed circuit is in the resistor-less
structure, which contains only four z-copy current follower transconductance
amplifiers (ZC-CFTAs) as active components together with two grounded capacitors
as passive components. As the first configuration, the current-mode BP filter
with high quality factor (Q) is proposed. The center frequency (wo) and the Q of the circuit
are orthogonal adjustable via the gm-value
of the ZC-CFTA. From the same topology, the mixed-mode quadrature oscillator
can easily be realized that is capable of generating two explicit quadrature
current outputs and two quadrature voltage outputs, simultaneously. Moreover, the realized oscillator
also provides the advantage of orthogonal
electronic control of the oscillation condition and oscillation
frequency, which makes it suitable as variable frequency oscillator. PSPICE simulation results using bipolar ZC-CFTA have been given to
verify the workability of the two proposed circuits.
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| Page(s): | 600-607 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.50(08) [August 2012]
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