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This paper presents the design of A S-band low noise amplifier (LNA), which is made up of two stages with Agilent's ATF-54143. The biasing circuit, input stage, middle stage and output stage matching circuits of the LNA are designed and simulated by the software Agilent ADS. At last, the designed circuit is fabricated and measured. It is showed that, from 2.15GHz to 2.65GHz, the gain is between 27...
For the problem that the detection of wideband target echo signals under low signal to reverberation plus noise ratio (SRNR) is very difficult, a scheme of time-frequency analysis detection for underwater acoustic signals based on wideband beamformer outputs is proposed in this paper, which combines time-domain wideband constant beamwidth beamforming (WCBB) together with time-frequency analysis. The...
A novel Y-cap. connection structure for Class II offline SMPS applications is proposed to suppress the common mode (CM) noise. With proposed concept, the size of the CM choke can be greatly reduced while satisfying the EMC standard. Furthermore, the inner shielding layer inside power transformer which is normally a must in product design to comply with the EMC standards can be eliminated for higher...
An analytical and closed-form optimal solution expressed in elementary functions for superdirectivity of a circular sensor array is proposed in this paper. By utilizing the circulant property of the data covariance matrix for circular sensor arrays, such solutions are derived to accurately calculate the optimal beamforming vector, optimal beam pattern, corresponding directivity factor, and eigenbeams...
In this paper, we present a novel intelligent control system for rat navigation based on video tracking and state machine techniques. And we demonstrate the automatic navigation of a rat to follow a preset course. The system consists of these components: (1) a wireless backpack stimulator comprised of stimulating circuit, control processor and bluetooth transceivers, (2) a video camera device capturing...
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