Abstract
The design theory of a UHF Amplifier for the front end of a Radio Relay System (380–400 MHz) is presented. Two methods are available for choosing proper source and load terminations for stable operation. The first method, Linvill technique, determines device stability, gain and bandwidth in terms of two port transistor parameters. Though the technique is conventionally graphical, a computer programme has been used here which with given ‘Y’ parameters calculates optimum source and load terminations and maximum power gain at the frequency of operation. Taking the source and load terminations, input and output matching circuit details are worked out. The second method is Stern's method, which is primarily circuit stability oriented and calculates input and output loading for maximum power gain. Two stage amplifiers are constructed based on both the design solutions and their performance discussed. Both lumped element and microstrip circuit realisations are given.
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