TY - JOUR
T1 - Small-signal parameters extraction and noise analysis of CNTFETs
AU - Ramos-Silva, Javier N.
AU - Pacheco-Sánchez, Aníbal
AU - Enciso-Aguilar, Mauro A.
AU - Jiménez, David
AU - Ramírez-García, Eloy
N1 - Publisher Copyright:
© 2020 IOP Publishing Ltd.
PY - 2020/3/19
Y1 - 2020/3/19
N2 - The use of carbon nanotube (CNT) field-effect transistors (FETs) in microwave circuit design requires an appropriate, immediate and efficient description of their performance. This work describes a technique to extract the parameters of an electrical equivalent circuit for CNTFETs. The equivalent circuit is used to model the dynamic and noise performance at low-and high-frequency of different CNTFET technologies, considering extrinsic and intrinsic device parameters as well as the contact resistance. The estimation of the contact resistance at the metal/CNTs interfaces is obtained from a Y-function based extraction method. The noise model includes four noise sources: thermal noise, thermal channel noise, shot channel noise and flicker noise. The proposed model is compared with a compact model calibrated to hysteresis-free experimental data from a high-frequency multi-tube (MT)-CNTFET technology. Additionally, it has been applied to experimental data from another fabricated MT-CNTFET technology. The comparison in both cases shows a good agreement between reference data (simulation and experimental) and results from the proposed model. Low-and high-frequency noise projections of the fabricated reference device are further studied. Noise results from both studied technologies show that shot noise mainly contributes to the total noise due to the presence of Schottky barriers at contacts and along the channel.
AB - The use of carbon nanotube (CNT) field-effect transistors (FETs) in microwave circuit design requires an appropriate, immediate and efficient description of their performance. This work describes a technique to extract the parameters of an electrical equivalent circuit for CNTFETs. The equivalent circuit is used to model the dynamic and noise performance at low-and high-frequency of different CNTFET technologies, considering extrinsic and intrinsic device parameters as well as the contact resistance. The estimation of the contact resistance at the metal/CNTs interfaces is obtained from a Y-function based extraction method. The noise model includes four noise sources: thermal noise, thermal channel noise, shot channel noise and flicker noise. The proposed model is compared with a compact model calibrated to hysteresis-free experimental data from a high-frequency multi-tube (MT)-CNTFET technology. Additionally, it has been applied to experimental data from another fabricated MT-CNTFET technology. The comparison in both cases shows a good agreement between reference data (simulation and experimental) and results from the proposed model. Low-and high-frequency noise projections of the fabricated reference device are further studied. Noise results from both studied technologies show that shot noise mainly contributes to the total noise due to the presence of Schottky barriers at contacts and along the channel.
KW - CNTFET
KW - modeling
KW - noise
KW - small-signal
UR - http://www.scopus.com/inward/record.url?scp=85083171834&partnerID=8YFLogxK
U2 - 10.1088/1361-6641/ab760b
DO - 10.1088/1361-6641/ab760b
M3 - Artículo
SN - 0268-1242
VL - 35
JO - Semiconductor Science and Technology
JF - Semiconductor Science and Technology
IS - 4
M1 - 045024
ER -