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NBTI is a well-known reliability issue. Therefore, which approach adopted for lifetime assessment becomes very important. Slow measurement overestimate lifetime due to recovery, and fast technique suppress recovery result to obtain less degradation slope. So these two methods cannot give reliable lifetime prediction. This paper discusses a new measuring skill that helps us to realize characteristic...
Recently, soft magnetic thin films with high complex permeability μ, which can be used in the devices working at GHz range, have drew great attentions. A reliable and authentic permeability is very important for their applications. Microwave complex permeability μ=μ'+jμ" can be obtained by using the vector network analyzer (VNA). Generally, a jig was used to hold the magnetic thin films and detect...
A compact conformal planar inverted-F antenna (PIFA) array, working at UHF band, is presented in this paper. This array consists of four PIFA elements. The parallel feeding network has been designed to drive the elements. The size of the proposed array is 100.5 mm × 48 mm. The proposed antenna is fabricated on a very thin substrate with a thickness of 0.254 mm, which is benefit for conformal structure...
This paper presents a highly efficient GaN Doherty power amplifier (DPA) with 100 MHz signal bandwidth and 40 dBm average output power for 3.5 GHz LTE-Advanced application. The carrier and peaking amplifiers are fabricated using 60-W GaN HEMT and implemented with unequal saturation power (Psat) in order to maintain high efficiency at large backed-off power (BOP). The highest drain efficiency (DE)...
We report a 9.1 GHz fiber-based RF frequency dissemination chain over 80 km. Using an improved phase noise compensation scheme, the frequency dissemination stability has been improved from 4×10−17/105 s to 1.1×10−18/105 s.
Sub-kHz lasing linewidth of a CaF2 whispering gallery mode (WGM) resonator passively stabilized ring laser has been observed. A detailed frequency analysis including a three-cornered-hat measurement yields a linewidth of 643Hz.
This paper reports a kind of intercoupled silicon dual-microcantilevers for ultrasensitive mass detection based on the relative change in the amplitude ratio of the out-of-phase vibration eigenstate of the dual-cantilevers. The structural intercoupling of the dual-cantilevers arises from the coupling overhang connecting them at the base. The whole structure operation is excited by a piezoactuator...
This paper presents a new protection scheme for AC zonal distribution system proposed for future marine power systems based on active impedance estimation. This technique actively imposes small transient disturbances onto the system at a point of measurement to excite the system in real time and estimate the system impedance over a broad frequency range at that point. The identified impedance can...
We report an advanced InP/InGaAs double heterojunction bipolar transistor technology using aggressive scaling in device layout and epitaxial stack. The device employs a 220 Aring highly doped base and a 1200 Aring collector designed to support current densities in excess of 12 mA/mum2. Transistors with emitter width of 0.25-mum have exhibited simultaneous measured fT and fmax frequencies in the...
The environmental static magnetic field and electromagnetic fields of various frequencies were measured around the Large Helical Device (LHD), a fusion plasma facility located in Japan. The LHD uses a superconducting magnet coil system and high-power plasma heating devices. Usually, leakage of the static magnetic field strength was less than 0.1 mT, but it varied according to the experimental conditions...
In this paper, we present the latest advancements of short gate length InGaAs/InAlAs/InP high electron mobility transistor (InP HEMT) devices that have achieved extremely high extrapolated Fmax above 1 THz. The high Fmax is validated through the first demonstrations of sub-MMW MMICs (s-MMICs) based on these devices including the highest fundamental transistor oscillator MMIC at 347 GHz and the highest...
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