Abstract
In this paper, a novel low voltage low power CMOS second generation voltage conveyor (VCII) with an improved voltage range at both the X and Z terminals is presented. The proposed VCII is formed by a current buffer based on a class AB regulated common-gate stage and a modified rail-to-rail voltage buffer. Spice simulation results using LFoundry 0.15 μm low-Vth CMOS technology with a ±0.9 V supply voltage are provided to demonstrate the validity of the designed circuit. Thanks to the class AB behavior, from a bias current of 10 µA, the proposed VCII is capable of driving 0.5 mA on the X terminal, with a total power consumption of 120 µW. The allowed voltage swing on the Z terminal is at least equal to ±0.83 V, while on the X terminals it is ±0.72 V. Both DC and AC voltage and current gains are provided, and time domain simulations, where the voltage conveyor is used as a transimpedance amplifier (TIA), are also presented. A final table that summarizes the main features of the circuit, comparing them with the literature, is also given.
Highlights
Since the introduction of current conveyors in 1968 [1], the well-known operational amplifiers (Op-Amps) have started to be replaced in several applications [2,3,4]
As the CCII lacks a low impedance voltage output port, it is not suitable for applications requiring output signal in the voltage form because, in these cases, an extra voltage buffer is needed to provide low output impedance, which results in higher power consumption and higher chip area
Electronics 2019, 8, 1292 suffered from limited voltage swing at the voltage output port [14,15,16], in this paper, we propose a new low voltage low power VCII with improved voltage range (rail-to-rail, (RtR)) characteristic at the output of terminal Z, and at the input of terminal X
Summary
Since the introduction of current conveyors in 1968 [1], the well-known operational amplifiers (Op-Amps) have started to be replaced in several applications [2,3,4]. Electronics 2019, 8, 1292 suffered from limited voltage swing at the voltage output port [14,15,16], in this paper, we propose a new low voltage low power VCII with improved voltage range (rail-to-rail, (RtR)) characteristic at the output of terminal Z, and at the input of terminal X. This will fully take advantage of its inherent transimpedance amplifier (TIA) behavior, making it suitable in applications where information has to be converted from the current to the voltage domain [21,22].
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