A Novel Simple Differentiator Circuit Based on Carbon Nano Tube Field Effect Transistors Voltage Difference Transconductance Amplifier

: This paper brings in a new design, namely, voltage mode differentiator with an active element, Carbon Nanotube Field Effect Transistors Voltage Difference Transconductance Amplifier (CNVDTA). The circuit thus proposed needs one Carbon Nanotube Field Effect Transistors Voltage Difference Transconductance Amplifier (CNVDTA) element and a single capacitor. While fabricating IC’s in VLSI design, the proposed circuit proves more adaptable and applicable with the anticipated results. Methods: The proposed CNVDTA based voltage mode differentiator in CNFET technology was simulated at 32 nm at a voltage supply of ±0.9 V using the Cadence Virtuoso CAD tool. Results: It is also reported that the proposed circuit would function with ±0.9 V supply voltage and would also take care of the bias current of the order of 150 µA. Further, on the part of the transconductance (gm), it is electronically tunable with the help of bias current. Conclusion: The CNVDTA based differentiator has been found to be very useful in the triggering circuit of CRO’s, wave shaping circuits, power control circuits etc. It is also found useful in detecting the high-frequency components in the input signals.

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A Novel Dual Output Comparator Based on Carbon Nano Tube Field Effect Transistors Second Generation Current Controlled Conveyor

Micro and Nanosystems ◽

10.2174/1876402912999201209211133 ◽

2020 ◽

Vol 12 ◽

Author(s):

Petluri Venkata Subbarama Murali Krishna ◽

Avireni Srinivasulu ◽

Rajesh Kumar Lal

Keyword(s):

Carbon Nanotube ◽

Analog Circuits ◽

Communication Systems ◽

Field Effect ◽

Second Generation ◽

Supply Voltage ◽

Field Effect Transistors ◽

Threshold Level ◽

Substantial Improvement ◽

Signal Acquisition

Aim:: Current comparators are useful in many analog circuits and communication systems. The increasing demand to integrate wearable health monitoring systems in telemedicine and biomedical applications that helps in early detection of abnormal conditions in patients, comparator is one of its core. Objective:: Wearable and implantable medical devices work primarily on signal acquisition and wireless transmission. In signal acquisition, analogue to digital converter (ADC) is the prime module. Conversion is done using the sampling process and samples are generated by comparing the input signal with the threshold level. For this purpose, comparator circuits are more preferable. This manuscript presents a novel dual output comparator design by using carbon nanotube field effect transistor second generation current controlled conveyor (CNCCCII). This CNCCCII is realized with the present day technology called carbon nanotube field effect transistors (CNFETs). Methods/Results:: The proposed comparator topology is designed with 32 nm CNFET technology files with a supply voltage of ±0.9 V using Cadence Virtuoso simulator tool. The performance of the proposed design is tested using transient analysis, Montecarlo analysis, temperature sweep, and finally compared with the existing models. Conclusion:: The proposed comparator has the advantage of requiring single CNCCCII with only one resistor and is preferable for monolithic IC fabrication. The proposed circuit implemented using CNFETs gives a substantial improvement in supply voltage requirement and less variation in output voltage levels over the existing technologies.

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