PA and LNA: Why you cann’t use a RF Amplifier replace LNA in Receiver Design
Using a power amp as a preamp seems logical but can cripple your system. This choice will drown weak signals in noise, making them impossible to recover. No, you should never use a power amplifier as a preamp. A power amp has a very high noise figure1, designed for output power, not sensitivity. Using one […]
Why RF Wideband Amplifier Flat Gain Droop: The Secrets of R-L-C Network
Designing a multiband SSPA with a perfectly flat gain curve feels like an impossible task. The physics just seems to be working against you. But it is achievable. To design a multiband Solid State Power Amplifier (SSPA) with flat gain, you must combine three techniques1. First, use a negative feedback circuit for stability. Second, add […]
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