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Terahertz (THz) direct detectors based on superconducting niobium nitride (NbN) hot electron bolometers (HEBs) with microwave (MW) injection have been studied. Compared to the thermal biasing method, the injected MW is used here to bias the HEB to the optimum point. MW can be expected to be used as the easy read out for the detecting array. The used NbN HEB has an excellent performance as heterodyne...
This paper presents a terahertz (THz) spectrometer based on high temperature superconducting Josephson junction. The YBa2Cu3O7 (YBCO) bi-crystal Josephson junctions (JJS) with log-periodic antennas are used as detectors. In the low temperature, with the signal measurement, data acquisition and human-computer interactive system, the automatic measurement system of THz spectrometer is finally accomplished...
We present design and development of a low-cost, quad flat no-lead (QFN) package that operates over DC to 40 GHz frequencies and is fully compatible with existing leadframe processes. Further, we discuss a novel technique to characterize the package interconnect that first involves removal of plastic from the package. Once the die-paddle is exposed, a probe-ready alumina substrate adapter is inserted...
A model predicting the negative bias temperature instability (NBTI) reliability of high performance nitrided oxides is developed from discrete p-type metal-oxide-semiconductor field effect transistor (PMOSFET) data and verified with ring oscillator degradation in various frequencies for up to 1 GHz. Based on the experimental data and the simulation results, hole traps generation is considered to be...
This work presents a dual-band CMOS voltage-controlled oscillator (VCO) design by using a pair of transformers as part of a switching resonator for band selection. The proposed design is characterized mainly by its ability to achieve two separate wide tuning bands. Additionally, the VCO phase noise is significantly diminished by applying the impedance locus method. Consequently, the dual-band VCO...
The question of whether or not structural test measurements can be used to predict functional or system Fmax, has been studied for many years. This paper presents a data learning approach to study the question. Given Fmax values and structural delay measurements on a set of sample chips, we propose a method called conformity check whose goal is to select a subset of conformal samples such that a more...
Crawling deep web is the process of collecting data from search interfaces by issuing queries. With wide availability of programmable interface encoded in Web services, deep web crawling has received a large variety of applications. One of the major challenges crawling deep web is the selection of the queries so that most of the data can be retrieved at a low cost. We propose a general method in this...
Soliton self-frequency shifting from 1 mum to 1.5 mum, connecting the ytterbium and erbium emission wavelengths, is demonstrated. It is confirmed that the timing jitter induced by the shifting is mainly caused by the laser intensity noise.
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