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In this paper a universal current mode OTA-C biquad with single input and minimum components is presented. The circuit uses only two multiple output OTAs and two capacitors and as such is a canonic design. The circuit realizes all the responses i.e. low-pass, high-pass, bandpass, band-stop and all-pass.
The design of a low-cutoff-frequency Gm-C low-pass filter is presented, the key part in the filter, the operational transconductance amplifier utilize a folded-cascode structure. As the circuit is desired to operate at low frequency, it is necessary to design a small linear trans-conductance amplifier employing a cross-coupled input stage. To compensate the gain loss, the auxiliary amplifiers are...
In this article, a parameter-varying lowpass filter whose transient response has a reduced duration is presented. The compensation of its transient behaviour is done by means of a temporary increase of the filter parameters. The proposed filter is implemented by means of OTAs and capacitors. The resulting circuit is used in the implementation of a fourth-order Chebyshev filter with appreciable ringing...
A high input impedance electronically tunable voltage-mode biquadratic filter with single input and three outputs using four simple CMOS operational transconductance amplifiers and two grounded capacitors is proposed. The proposed filter provides low-pass, band-pass and high-pass voltage responses at a high input impedance terminal, which enables easy cascadability of the voltage circuit. Also, the...
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