ECEN 5014 , Spring 2013
نویسنده
چکیده
The challenge in designing a broadband microwave amplifier is the fact that the input impedance at lower frequencies is practically an open circuit, and at higher frequencies predominantly capacitive and can be almost a short. This makes broadband matching difficult. For example, the TriQuint device we used for the project has an input impedance that is practically an open circuit at 0.1GHz, is almost purely capacitive at 1GHz and about 35+j60 at 5GHz (the package inductance starts dominating at the higher frequencies). It is clear that designing an impedance matching circuit that can cover this frequency range is a difficult task. In this lecture, we discuss possible approaches for small-signal amplifiers, but the challenge for power amplifiers is similar.
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