Abstract
This article presents a dual-mode (voltage-mode and current-mode) universal biquadratic filter performing completely standard functions: lowpass, highpass, bandpass, band-reject, and allpass functions, based on plus-type dual-output second-generation, current controlled, current conveyor (DO-CCCII+). The features of the circuit are that the bandwidth and natural frequency can be tuned electronically via the input bias currents: the circuit description is very simple, consisting of merely 2 DO-CCCIIs and 2 capacitors: the circuit can provide either the voltage-mode or current-mode filter without changing circuit topology. Additionally, each function response can be selected by suitably selecting input signals with digital method. Without any external resistors, the proposed circuit is very suitable to further develop into an integrated circuit. The PSPICE simulation results are depicted. The given results agree well with the theoretical anticipation. The maximum power consumption is approximately 1.81 mW at±1.5 V supply voltages.
Highlights
An analog filter is an important block and widely used for continuous-time signal processing
The literature surveys show that the dual-mode universal filter circuit using different high-performance active building blocks such as OTAs [11,12,13], current feedback op-amps (CFOAs) [14], current feedback amplifiers (CFAs) [15, 16], four-terminal floating nullors (FTFNs) [16,17,18,19], and current conveyors [20,21,22,23,24] have been reported
DOCCCII has the advantage of electronically adjustability over the CCII, because it allows the adjustment of RX via the bias current IB as shown by where VT is the thermal voltage
Summary
An analog filter is an important block and widely used for continuous-time signal processing. The literature surveys show that the dual-mode universal filter circuit using different high-performance active building blocks such as OTAs [11,12,13], current feedback op-amps (CFOAs) [14], current feedback amplifiers (CFAs) [15, 16], four-terminal floating nullors (FTFNs) [16,17,18,19], and current conveyors [20,21,22,23,24] have been reported. Its performances are illustrated by PSPICE simulations; they show good agreement as mentioned
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