Abstract
The physical constraints of ever-shrinking CMOS transistors are rapidly approaching atomistic and quantum mechanical limits. Therefore, research is now directed towards the development of nanoscale devices that could work efficiently in the sub-10 nm regime. This coupled with the fact that recent design trend for analog signal processing applications is moving towards current-mode circuits which offer lower voltage swings, higher bandwidth, and better signal linearity is the motivation for this work. A digitally controlled DVCC has been realized using CNFETs. This work exploited the CNFET’s parameters like chirality, pitch, and numbers of CNTs to perform the digital control operation. The circuit has minimum number of transistors and can control the output current digitally. A similar CMOS circuit with 32 nm CMOS parameters was also simulated and compared. The result shows that CMOS-based circuit requires 418.6 μW while CNFET-based circuit consumes 352.1 μW only. Further, the proposed circuit is used to realize a CNFET-based instrumentation amplifier with digitally programmable gain. The amplifier has a CMRR of 100 dB and ICMR equal to 0.806 V. The 3 dB bandwidth of the amplifier is 11.78 GHz which is suitable for the applications like navigation, radar instrumentation, and high-frequency signal amplification and conditioning.
Highlights
CMOS technology is predominantly serving the electronics industry for the last 40 years
As the characteristics of a carbon nanotube field effect transistor (CNFET) are superior to bulk CMOS, new design methodologies must be established
CNFET has a potential to overcome the challenges of present CMOS technology
Summary
CMOS technology is predominantly serving the electronics industry for the last 40 years. This technique is novel but requires a large number of passive components All these techniques use CMOS technology for the design of digital control block. The feature of the carbon nanotube is explored by which the drain current in a transistor is controlled by the number of CNTs in the channel. This property can be utilized to design a digitally controlled current conveyor. The proposed method uses multiple CNTs to increase the drain current of the transistor After that, this digital control approach is used to implement an instrumentation amplifier with programmable gain which can be useful in navigation and radar instrumentation systems.
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