This paper describes a CMOS 16:1 binary-tree multiplexer (MUX) using 0.18-µm technology. To provide immunity for wide frequency range and process-and-temperature variations, the MUX adopts several delay compensation techniques. Simulation results show that the proposed MUX maintains the setup margins and hold margins close to the optimal value, i.e., 0.5UI, in wide frequency-range and in wide process-and-temperature variations, with standard deviation of 0.05UI approximately. These results represent that these proposed delay compensations are effective and the reliability is much improved although CMOS logic circuits are sensitive to those variations.
The basic performance of a newly developed microscopic magneto-optic probe is described. The probe was fabricated by directly depositing a Bi-substituted yttrium iron garnet [Bi-YIG] film onto the optical fiber edge using aerosol deposition. This fabrication process is inexpensive and simple because there are no complicated procedures such as fine lithography and etching. The film is 125-µm-wide, which is the same as the diameter of a typical single mode fiber, and approximately 10-µm-thick. The 3-dB bandwidth and spatial resolution of the probe were found to be about 3GHz and in the 10-µm order, respectively. Because the developed magneto-optic probe is very tiny and thin, it can be a powerful tool for detailed electrical characterization of densely packaged electronic circuits.
We report on the design and construction of a prototype band pass filter using inductive-strips (E-plane planar circuits) based on electromagnetic-field simulations. We also report on the construction and characteristics of a prototype duplexer consisting of two band-pass filters-one each for the uplink and downlink-and a Y-shaped branch circuit. As a result of the experiment of duplexer, an insertion loss of about 3.1dB in a bandwidth of 195MHz for the uplink filter and an out-of-band attenuation of 50dB at 41.47GHz could be achieved. And an insertion loss of about 3.0dB in a bandwidth of 763MHz for the downlink filter and an out-of-band attenuation for the downlink filter of 59dB at 42.09GHz could be achieved.
The global rising security concerns propel growth of biometrics recognition techniques. Iris recognition is widely regarded as one of the most promising biometrics methods because of its high accuracy. Among the whole iris recognition process, how to capture the significant features in the iris pattern and to encode them efficiently is a hard task. In this paper, an innovative method is proposed to extract iris features according to iris anatomical structure characteristics. The proposed method can represent the iris pattern with less redundancy and moreover less computational demanding than traditional methods.