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The most common device used as an LNA is ________(a) Zener diode(b) Tunnel diode(c) IMPATT(d) Shockley diodeThis question was posed to me in final exam.My question is based upon Satellite Systems topic in portion Satellite Systems & Recent Advances of Wireless/Mobile

Answer»

The correct CHOICE is (b) Tunnel diode

The explanation is: The LNA MUST provide a relatively flat RESPONSE for the frequency range of INTEREST, preferably with less than 1 dB of gain variation. The most common device used as an LNA (LOW noise amplifier) is tunnel diode. It is a highly sensitive, low-noise device.



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