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In this paper, we present and discuss a general and modular semi-analytical analysis method for the electrical and the noise characterization of noisy linear four-port circuits. The analysis method presented builds upon the concept of noise correlation matrices and is valid for both two-port and four-port electrical networks. We also consider a four-port active transversal filter case study for which we compare the measured results with those obtained from the analysis presented here. The analytical results are in very good agreement with measured results. Index Terms--Distributed structure circuits, four-port linear networks, noise modeling, transversal filters.

The use of a distributed-amplifier-based transversal filter as a signal processor for high-rate pulse shaping/filtering is discussed. By showing the analogy between transversal filters and distributed-amplifier topologies, schemes demonstrating practical approaches for the design of such filters are explored. The practicability of one of the different schemes is illustrated via an implemented design. A four-stage 40-Gb/s distributed-amplifier monolithic microwave integrated circuit (MMIC) is constructed using one of the developed schemes and its behavior is discussed. Index Terms - Distributed amplifiers, filters, MMIC amplifiers, optical receivers, transversal filters.

A new circuit technique is presented to achieve extended low-frequency operation for integrated circuit amplifier stages in which the maximum value of decoupling capacitor is restricted by processing technology limitations. Details are provided of a wideband heterojunction bipolar transistors (HBT) 50 [Omega] output buffer stage for a photo preamplifier which embodies this new active decoupling technique for bandwidth extension. Index Terms--Decoupling, HBT's, MMIC amplifiers.