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This paper describes a new electronically tunable four inputs and single output voltage-mode universal biquadratic filter based on simple CMOS operational transconductance amplifiers (OTAs) and grounded capacitors. The proposed filter provides low-pass, high-pass, band-pass, band-stop and all-pass voltage responses at a high impedance input terminal, which enable easy cascadability. The circuit parameters...
In this paper, multi-channel neural signal recorder with tunable gain filter is proposed. It is characterized by small-gm OTA for lowering cutoff frequency. The prototype of the proposed system is designed in TSMC 0.18 μm CMOS technology. Filter consists of high pass filter of delta-gm structure OTA with 201.06 pA/V transconductance and tunable gain Gm-C low pass filter. Single slope ADC is used to...
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.
This paper proposes a core structure that provides, with minimum of adjustments, a wide range of second-order transfer functions, from the usual low-pass and band-pass to transfer functions with imaginary and complex zeroes. This universal biquad is implemented with transconductors and grounded capacitors. The performances of similar structures reported in the literature are significantly degraded...
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...
A voltage-mode versatile multifunction filter with four inputs and three outputs biquadratic filter based on simple CMOS operational transconductance amplifiers (OTAs) is presented. By appropriately connecting the input and output terminals, the proposed circuit can work as either a single-input multiple-output (SIMO) or a multiple-input single-output (MISO) filter without changing the circuit topology...
This article presents a current-mode universal biquadratic filter (low-pass, high-pass, band-pass functions), based on multiple-output current controlled current conveyor transconductance amplifiers (MO-CCCCTAs). The features of the circuit are that: the quality factor and pole frequency can be tuned orthogonally via the input bias currents: the circuit description is very simple, consisting of merely...
A new voltage-mode three inputs and one output universal biquadratic filter with high-input impedance employing six simple operational transconductance amplifiers (OTAs) and two grounded capacitors is presented. The proposed circuit offers the following features: realization of all the standard filter functions, that is, highpass, bandpass, lowpass, bandstop, and allpass filters; electronically tunable...
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