External noise incorporates any type of exterior influences, including exterior parts and electrical/electromagnetic interference. Interference is defined as any unwelcome alerts arriving as both voltage or current, at any from the amplifier’s terminals or induced in its involved circuitry. It might seem as spikes, ways, sine waves, or random sound. https://low-noise-amplifier90000.isblog.net/the-smart-trick-of-low-noise-amplifier-that-no-one-is-discussing-54443574