Abstract
This paper presents an electronically tunable current/trans-impedance-mode biquad universal filter employing only single multi-output current controlled current conveyor trans-conductance amplifier (MO-CCCCTA) and two grounded capacitors. The proposed filter realizes all the standard filter func-tions i.e. low pass (LP), band pass (BP) and high pass (HP), notch and all pass (AP) filters in the current form at high impedance output through appropriate selection of the input signals, without any matching conditions. Simultaneously, it can also realize all the standard filter functions in trans-impedance form from the same circuit topology. The circuit does not require inverting-type input current signal(s) and double input current signal(s) to realize all the responses in the design. The validity of proposed filter is verified through PSPICE simulations.
Highlights
Analog electronic filters are important blocks, widely employed in continuous time signal processing
Universal biquadratic filters belong to most popular analog filters, providing all standard filter functions (LP, band pass (BP), high pass (HP), Notch and all pass (AP)), without modifying the circuit topology
Several filter realizations either in current-mode, where the input and the output variables are current, or in voltage-mode, where the input and output variables are voltage, have been reported using different active elements [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22]. These filter circuits are classified as single input multiple output (SIMO) [1,2,3,4,5,6,7,8,9,10], multiple input single output (MISO) [11,12,13,14,15,16,17,18,19] and multiple input multiple output (MIMO) [20,21,22]
Summary
Analog electronic filters are important blocks, widely employed in continuous time signal processing. A three inputs and two outputs current-mode single DO-CCCDTA based filter circuit [20] realizes all the standard filter functions at high impedance outputs but it still require double input current signal to obtain an all-pass response. No previous paper has reported a filter based on single active element which can realize all the standard responses in current as well as trans-impedance form, together, without any matching conditions, from the same topology. The proposed filter realizes all the standard filter functions i.e. LP, BP, HP, notch and AP filters in the current form at high impedance output through appropriate selection of the input signals, without any matching conditions. The performance of proposed circuit is illustrated by PSPICE simulation using 0.35 μ CMOS parameters
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