Far East Journal of Electronics and Communications
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Abstract: A new voltage-mode
biquad filter is presented, which employs three differential difference current
conveyors (DDCCs), three single-ended operational transconductance amplifiers (OTAs)
and two grounded capacitors. The proposed circuit can realize five kinds of
filter responses such as low-pass, high-pass, band-pass, notch and all-pass
filters from the same configuration. Moreover, this circuit has no requirements
for component matching conditions, has no any resistances, and no floating
effects. The filter circuit has been confirmed by HSPICE simulations and
compared with theoretical functions by MATLAB. Finally, to verify our
architecture, we have implemented this analog filter chip with TSMC 0.35-mm 2P4M CMOS technology. This chip contains 167
transistors, operates to 500 KHz and consumes 23.69mW. The chip area of the
analog filter is
Keywords and phrases: biquad filter, differential difference current conveyors, operational transconductance amplifiers.
