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ABSTRACT: We report on negative differential transconductance (NDT) effect in Y-branch nanojunctions which leads to small-signal nonreciprocity of the device for certain biasing schemes. We present the dc analysis of the device from which we identify the bias regions where NDT effect occurs. We compare experimental dc measurements with results of Monte Carlo simulations, which yields very good qualitative and quantitative agreement. We perform a high-frequency analysis of the NDT effect up to 110 GHz which shows that the effect discussed is still present at such high frequencies
IEEE Transactions on Nanotechnology 12/2006; · 2.29 Impact Factor
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ABSTRACT: The problem of high input impedance of nanoscaled devices is analyzed for the case of a Y-Branch Junction. An electrical nonlinear model of YBJs validated on measured data is used to show influence of source impedance on HF to DC detection performance in YBJ. An impedance matching network is proposed and is proven to increase the detection sensitivity. Multiple 2DEG channels material used to fabricate parallel YBJ's stacked on one another is also proposed as an alternative solution to mismatch problem. It is shown that using multiple 2DEG the input impedance and reflection coefficient can be decreased but at the price of decrease in sensitivity
European Microwave Integrated Circuits Conference, 2006. The 1st; 10/2006
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ABSTRACT: A double Y-branch ballistic junction is proposed for rectification of signals up to 94 GHz. A nonlinear model is developed to predict the frequency dependence of its RF to DC conversion performances, and agrees very well with experiment. The model shows the importance of minimizing extrinsic parasitics when designing HF ballistic nanodevices.
Microwave Conference, 2005 European; 11/2005
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ABSTRACT: Room-temperature dc and broad-band high-frequency (HF) to dc conversion measurements of a double Y-branch junction (YBJ) are presented and discussed. Nonlinear dc characteristics of the devices at room temperature are observed and HF to dc conversion up to 40 GHz at room temperature is presented. The HF to dc conversion efficiency degradation is found to be partly due to losses in interconnects feeding the device. A small-signal equivalent circuit of the YBJ is proposed in order to verify the frequency dependence of intrinsic elements.
IEEE Transactions on Nanotechnology 10/2005; · 2.29 Impact Factor
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L. Bednarz, Rashmi,
B. Hackens,
H. Boutry,
V. Bayot,
I. Huynen,
J.-S. Galloo,
Y. Roelens,
S. Bollaert,
E. Pichonat,
A. Cappy
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ABSTRACT: Room temperature DC and broadband HF measurements of a double Y-branch junction are presented and discussed. Nonlinear DC characteristics of the devices at room temperature are observed and HF to DC conversion up to 20 GHz at room temperature is presented. Small-signal equivalent circuit of YBJ is proposed. The HF to DC conversion efficiency degradation is found to be due to parasitic crosstalk capacitance between the 2DEG access reservoirs of the device.
Nanotechnology, 2004. 4th IEEE Conference on; 09/2004
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Proc. of the International Conference on Nanoscience and Technology (ICONSAT 2003), Kolkata, India; 12/2003
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Proceedings of the TNT 2003 Conference (Trends in NanoTechnology), Salamanca, Spain; 09/2003
