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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.17 [2010] >
IJEMS Vol.17(2) [April 2010] >
| Title: | Novel current-mode and voltage-mode universal biquad filters using single CFTA |
| Authors: | Tangsrirat, Worapong |
| Keywords: | Current follower transconductance amplifier (CFTA)
Biquad filter
Current-mode circuit
Voltage-mode circuit |
| Issue Date: | Apr-2010 |
| Publisher: | CSIR |
| Abstract: | This paper presents two novel
electronically tunable universal filter configurations employing a single new
active device, namely the current follower transconductance amplifier (CFTA). The
first proposed current-mode universal filter with single input and three
outputs consists of one CFTA, one virtually grounded resistor and two grounded
capacitors. It can simultaneously realize low-pass, band-pass and high-pass
responses with no need to impose component choice. A new three-input single-output
universal voltage-mode biquad using one CFTA, two resistors and two capacitors
is also proposed as a second proposed circuit. The latter circuit can be
configured to realize all the five standard biquadratic filter functions;
low-pass, band-pass, high-pass, band-stop and all-pass, without changing the
circuit configuration. Both two universal biquad filters also offer the
advantage features of the use of minimum number of passive components, and
independent electronic tuning of the important filter parameters (ωo
and BW), as well as low active and passive sensitivities. To demonstrate the
performances of the proposed filters and verify the theory, PSPICE simulations
are accomplished. |
| Page(s): | 99-104 |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.17(2) [April 2010]
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