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In order to solve the problem of high CPU usage and long rendering time in large scale terrain rendering in the flight simulator visual system, a GPU-based terrain tessellation algorithm is presented. We introduce an adaptive tessellation factor model combines screen-space projected area, terrain energy function and movement error function. This model conforms more closely to the hypsography, the...
A background jitter calibration method is proposed in this paper. It detects the RMS jitter by the jitter distribution based on time-to-digital converter (TDC). The jitter calibration is realized by regulating the loop bandwidth through the charge pump current. Simulation results show that the peak-to-peak jitter is reduced from 154.6ps to 24.1ps and the RMS jitter is reduced from 40.5ps to 5.8ps,...
A novel quantum effect photodetector array consisted of AlAs/GaAs/InGaAs/GaAs/InAs/ quantum-dots in quantum-well hybrid structure has been tested. It showed a wide response wavelength range from 400nm to 1000nm. The low threshold voltage (−0.8V) and the high responsibility (10A/W) at 77K made it a good choice for optical detection. A custom-made capacitor feedback transimpendance amplifier (CTIA)...
In this paper, a novel Gaussian process echo state networks (GPESN) model is proposed for time series forecasting. This method establishes the direct relationship between the prediction origin and prediction horizon without iterating in the prediction process, which avoids the accumulative iteration error. Instead of using linear regression, Gaussian process is used to obtain the relationship between...
A low noise amplifier with dB-linear variable gain has been designed and fabricated based on high performance SiGe HBT in this paper. Negative feedback technology has been adopted to change the transmission gain of HBT through variable resistance of a forward biased p-i-n diode in the feedback path. The simulation results and measurement results agree well in frequency of 1.8GHz for CDMA application...
Interarea oscillatory modes pose a threat to power system stability. An algorithm is presented for the identification and analysis of such modes from high resolution phasor measurement data. The process outlined includes data collection, conditioning, extraction of the primary oscillatory frequency, and determination of participating areas of the system. Additionally a visualization methodology is...
Variability of the TiN FinFET SRAM cell performance is comprehensively studied. It is found that the static noise margin (SNM) variation of the SRAM cell is due to the Vth variation of FinFETs caused by the work function variation (WFV) of the TiN metal-gate. It is experimentally demonstrated that the Vth-controllable independent-double-gate (IDG) FinFET technology successfully compensates not only...
SRAM cells with Vth-controllable independent double-gate (IDG) FinFETs have been successfully fabricated. The performance of the fabricated SRAM cell with various circuit topologies has been investigated comprehensively. Both a reduction of leakage current and an enhancement of read and write noise margins have been successfully demonstrated by introducing the IDG FinFETs into the SRAM cells.
Imaging mass spectrometry is a method for understanding the molecular distribution in a two-dimensional sample. This method is effective for a wide range of molecules, but generates a large amount of data. It is difficult to extract important information from these large datasets manually and automated methods for discovering important spatial and spectral features are needed. Independent component...
The proliferation of wireless and mobile devices has fostered the demand of context aware applications. Location is one of the most significant contexts. Multilateration, as a basic building block of localization, however, have not yet overcome the challenges of (1) poor ranging measurement; (2) dynamic and noisy environments; (3) fluctuations in wireless communications. Hence, they often suffer poor...
Energy detection is a promising candidate for spectrum sensing of cognitive radio systems due to its merits of simplicity and easy implementation. However, energy detection needs to subjectively pre-configure a threshold and requires the knowledge of noise power. Furthermore, energy detection is vulnerable to noise uncertainty, which inevitably occurs in practical implementations. To solve the above...
Two numerical models based on the impedance field method have been implemented to investigate the flicker noise in MOSFETs with high-kappa gate stacks. The equivalent model uses approximate channel current noise source, while the physical model is based on the Langevin approach and accounts for the non-local carrier tunneling. The scaling impact on the flicker noise is investigated with the developed...
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