Abstract
A novel current mode active-only universal filter using four dual current output Operational Transconductance Amplifiers (OTAs) and three Operational Amplifiers (OAs) is presented. The circuit can realize low pass and high pass filter characteristics by choosing the suitable current output branches. The filter performance factors natural frequency (ω0), bandwidth , quality factor Q and transconductance gain gm are electronically tunable. The proposed circuit has very low sensitivities with respect to circuit active elements. From sensitivity analysis, it has been clearly shown that the proposed circuit has very low sensitivities with respect to the circuit active elements. The gain roll-off of high pass and low pass configuration is 18 dB/oc- tave. The proposed circuit facilitates integrability, programmability and ease of implementation.
Highlights
In recent years, current mode analogue signal processing circuit techniques have received wide attention due to the high accuracy, the wide signal bandwidth and the simplicity of implementing signal operations [1]
The multiple current output Operational Transconductance Amplifiers (OTAs) have been used for realizing current mode filters [7,8,9,10,11,12]
The proposed circuit is constructed with Operational Amplifiers (OAs) and dual current output OTAs
Summary
Current mode analogue signal processing circuit techniques have received wide attention due to the high accuracy, the wide signal bandwidth and the simplicity of implementing signal operations [1]. The design of current mode circuits employing active devices such as OAs, OTAs, and current conveyors (CCs) have been reported in the literature [2,3,4,5,6]. The multiple current output OTAs have been used for realizing current mode filters [7,8,9,10,11,12]. In 1996, Tsukutani et al proposed good versatile current mode biquad filter using multiple current output OTAs and two grounded capacitors
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