A system has three stage cascaded amplifier each stage having a power gain of 10 dB and noise figure of 6 dB. the overall noise figure is(a) 1.38(b) 6.8(c) 4.33(d) 10.43I got this question in an international level competition.I'd like to ask this question from Noise topic in portion EDC Overview of Electronic Devices & Circuits

A system has three stage cascaded amplifier each stage having a power

1.	A system has three stage cascaded amplifier each stage having a power gain of 10 dB and noise figure of 6 dB. the overall noise figure is(a) 1.38(b) 6.8(c) 4.33(d) 10.43I got this question in an international level competition.I'd like to ask this question from Noise topic in portion EDC Overview of Electronic Devices & Circuits
Answer» The CORRECT option is (c) 4.33 The explanation is: The gain at each stage is 10DB, HENCE the REQUIRED answer is 4 + (4-1)/10 + (4-1)/100 or 4.33.

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