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This paper presents current-mode first-order allpass filter using three operational transconductance amplifiers (OTAs) and grounded capacitor. The use of grounded capacitor makes the circuit more suitable for integrated circuit implementation. The current gain and phase shift can be independently controlled with electronic method. The circuit has high output impedance which enables easy cascading...
This article introduces a circuit which can function both as a quadrature oscillator and as a universal biquad filter (lowpass, highpass, bandpass). When the circuit functions as a universal biquad filter, the quality factor and pole frequency can be tuned orthogonally via the input bias currents. When it functions as a quadrature oscillator, the oscillation condition and oscillation frequency can...
This article introduces a capacitance multiplier employing operational transconductance amplifiers (OTAs). The provided capacitor is a floating element synthesized from a grounded capacitor. Its outstanding feature is that the capacitive value can be widely adjusted by input bias currents of the OTAs and is temperature-insensitive. The circuit construction comprises only four OTAs, three of them are...
This paper reviews 2 circuits which are floating positive and negative inductance simulators using operational transconductance amplifiers (OTAs). The simulated inductance values can be controlled electronically by adjusting the bias current of the OTA. Each inductance simulator comprises only 2 OTAs and 1 grounded capacitor without any external resistor and component matching requirements. The circuit...
This article reviews floating positive and negative resistance simulators, based on dual-output operational transconductance amplifier (DO-OTA). The features of proposed circuit are that: the resistance value can be controlled electronically by adjusting the input bias current of OTA, the schemes are very simple; they comprise only single DO-OTA without any passive element requirements, trey are suitable...
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