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Measuring RF interference in audio circuits

Posted: 20 Apr 2009 ?? ?Print Version ?Bookmark and Share

Keywords:RF interference? audio circuits? signal frequency?

Radio transceivers transmit voice and data signals by modulating a high frequency RF carrier signal with a much lower frequency signal. Sensitive circuits located near the antenna must be designed to reject interference caused by RF signals bleeding into the audio circuits. Layout and proximity to the transmitter can result in several different receiving sites on the circuit board that can cause interference at different frequencies. This application note describes a test platform using standard equipment found in most high frequency analog labs that can effectively characterize the interference sensitivity of an amplifier sub circuit.

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