Abstract
In this paper, the implementation of a low-voltage class AB second generation voltage conveyor (VCII) with high current drive capability is presented. Simple realization and good overall performance are the main features of the proposed circuit. Proper solutions and techniques were used to achieve high signal swing and high linearity at Y, X and Z ports of VCII as well as low-voltage operation. The operation of the proposed VCII was verified through SPICE simulations based on TSMC 0.18 µm CMOS technology parameters and a supply voltage of ±0.9 V. The small signal impedance values were 973 Ω, 120 kΩ and 217 Ω at Y, X and Z ports, respectively. The maximum current at the X port was ±10 mA with maximum total harmonic distortion (THD) of 2.4% at a frequency of 1 MHz. Considering a bias current (IB) of 29 µA and output current at the X port (IX) of 10 mA, the current drive capability (IX/IB) of about 345 was achieved at the X port. The voltage swing at the Z port was (−0.4, 0.4) V. The THD value at the Z port for an input signal with 0.8 V peak-to-peak value and frequency of 1 MHz was 3.9%. The total power consumption was 0.393 µW.
Highlights
Since the introduction of current-mode signal processing, second generation current conveyors (CCII) [1] have been employed in various circuits, such as inductance simulators [2,3], filters [4,5,6], oscillators [7,8,9], and instrumentation amplifiers [10,11,12] as possible substitutes for conventional operational amplifiers (OAs)
In [16], the authors showed that most of the analog signal processing circuits are realizable by VCII with the advantage of providing output voltage signal at the low impedance Z port of VCII
In this paper we propose a VCII with high current drive capability at the X terminal
Summary
Since the introduction of current-mode signal processing, second generation current conveyors (CCII) [1] have been employed in various circuits, such as inductance simulators [2,3], filters [4,5,6], oscillators [7,8,9], and instrumentation amplifiers [10,11,12] as possible substitutes for conventional operational amplifiers (OAs). In [13,14,15], the concept of dual topology of CCII, called a second generation voltage conveyor (VCII), was introduced For this duality, VCII shows the additional advantage of providing output signal in the form of voltage. Analyzing the previously reported VCII circuits, it appears that most of them [16,17,18,19,20,21,22,23,24] are designed in class A, which has limited current drive capability at the X port. Designing circuits with high current drive capability under low supply voltage restriction is a very challenging task. Due to low voltage restrictions, cascode structures are avoided and the required high linearity in the X port output current is maintained using simple controlling circuits by means of three transistors.
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