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We investigate statistical behaviors of steady-state p-n junction leakage currents at source/drain of MOSFET devices (Ileaks) and dynamic fluctuations of Ileaks using a newly developed test circuit. The test circuit can acquire the leakage currents from 28,672 n+-p diodes in 7.7 s with 10 times averaging with the range from 0.1 fA to 23 fA. We demonstrate that two normal distributions exist in the...
We report on stabilization of CMOS power transistors employing a new layout concept. We assume that instability of power transistors is caused by intensified impact ionization at the pinch-off channels, and that the impact ionization is synchronized with acoustic standing waves in the device area if they are designed with conventional layout configurations. In the new layout design, gate fingers are...
In this paper, we describe improved designs of a printed disc monopole antenna for UWB application, focusing on miniaturization of the disc radiator with the size of the ground fixed. In order to decrease the antenna size, an exponentially curved notch on the ground plane of the antenna was investigated, and the optimal design of the shape of notch verified. By appropriately adjusting the size of...
Laboratory experiments were developed for measuring the frequency characteristics of operational amplifier circuits using a personal computer with a data acquisition unit. A periodic rectangular wave, which is easily generated by a DA (digital/analog) converter, is applied to the circuit: then the steady-state response is digitized by an AD converter. Filon's method was used for the numerical Fourier...
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