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In the context of telecommunication networks, the network terminals involve certain constraints that are either related with the performance of the corresponding network or with the availability of some classes of devices. In this paper, we discuss a tree-like telecommunication network design problem with the constraint limiting the number of terminals. First, this problem is formulated as a leaf-constrained minimum spanning tree (lc-MST). Then we develop a tree-based genetic representation to encode the candidate solutions of the lc-MST problem. Compared with the existing heuristic algorithm, the numerical results show the high effectiveness of the proposed GA approach on this problem. Keywords: genetic algorithms; network design; minimum spanning tree; telecommunication

Incorporation of a silicon fillet self-aligned contact (SIFT) process in the super self-aligned half micron BiCMOS technology facilitates high speed operations in ECL and CMOS bipolar circuits. The compatibility of bipolar and CMOS devices helps simplify the integrated process flow in the circuit with the SIFT process reducing CMOS drain and device source capacitance. Gate delay values for bipolar and CMOS circuits are 24 ps and 50 ps, respectively, on 0.6-micrometer-thick gate ring oscillators. The operation of this technology in a single phase decision circuit and a static frequency divider proves the technology's validity.