CNTFETbased classABcurrent conveyorII: Design, analysis and waveform generator applications

Abstract

In this work, we design and simulate a new class AB second generation current conveyor (CCII) employing 32 nm technology node carbon nanotube field effect transistors (CNTFET). The performance of the proposed CNTFET based class AB CCII (CNTFET-CCII) has been optimized by altering the number of carbon nanotubes (CNTs) (N), CNT pitch (S), and CNT diameter (D CNT). The proposed CCII has been compared with the conventional CMOS-based class AB CCII (CMOS-CCII). The simulation study has revealed that in the proposed CCII, the voltage and current bandwidth (BW) have enhanced by two orders, terminal X resistance

CNTFET‐based active grounded inductor using positive and negative current conveyors and applications

“…Figure 6(A)–(D) shows the transient responses of the proposed CNTFET‐CCII− and CMOS CCII− circuits. Besides, it shows the transient response of CNTFET‐CCII+ as proposed in our recent work, 21 along with the CMOS‐CCII+, which has not been done earlier. For the transient analysis, a sinusoidal input current source of frequency 1 MHz is applied at terminal X of each circuit.…”

“…Figure 6 shows 180 ° phase shifts in the positive and negative ended CMOS and CNTFET‐based CCIIs. Figure 6(E) and (F) shows the linearity analysis of the CMOS‐CCII+ and CNTFET‐CCII+ 21 and the proposed CMOS‐CCII− and CNTFET‐CCII− circuits. It is clear that the CNTFET‐based CCII+ as well as CCII− show more linearity (−0.5 V to +0.5 V) than the CMOS‐based counterparts (−0.4 V to +0.4 V).…”

“…The CNT pitch changes the width and hence changes the drain current in a CNTFET, as given by Equation (2) 19 . Figure 11(A),(B) shows a noticeable change in 3‐dB voltage and current bandwidth with S. For small pitch value, the gate capacitance and drive current for middle of nanotubes are small compared to the tubes at the edge 21 . So, due to the electrostatic repulsion between the tubes for small S, the electrons are driven away from the centre of the tube, hence resulting in drain current reduction.…”

“…The AGI realization needs both positive and negative current conveyors (CCII+ and CCII−). The CNTFET‐based CCII+ designed and simulated by us in Reference 21 has been used in realizing the proposed AGI and is given in Figure 4.…”

“…For the first time, the CNTFET‐based AGI has been designed and simulated. The proposed AGI employs the CNTFET‐CCII− designed in this work and our recently proposed CNTFET‐CCII+ 21 . It is power efficient, has high quality factor and high bandwidth with only two active CC blocks and three grounded passive components.…”