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Electronics 3 Checkbook. The Checkbooks Series by S.A. Knight, J.O. Bird and A.J.C. May (Auth.)

By S.A. Knight, J.O. Bird and A.J.C. May (Auth.)

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The signal-to-noise ratio in the load is 50. If the temperature doubles, the signal-tonoise ratio will be (a) unaffected, (b) 25, (c) 100, (d) 200. The maximum noise power which can be delivered to a load of resistance R is (a) kTB, (b) kTBR, (c) AkTBR, (d) V(4kTBR). An amplifier has a power gain of 100. The noise power measured at its output is 100 times the noise power at its input. Its noise factor is (a) 0 dB, (b) 20 dB, (c) 40 dB, (d) 100 dB. (c) CONVENTIONAL PROBLEMS 1 28 If the signal level at a tape recorder head output is 1 mW and the signal-to-noise ratio is 30 dB, what is the output noise power?

27 (b) MULTI-CHOICE PROBLEMS (answers on page 152) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 If temperature and bandwidth are both doubled, the noise voltage generated by a wirewound resistor will be (a) doubled, (b) halved, (c) quadrupled, (d) unaffected. Two resistors each having identical noise voltages are joined in series. The total noise voltage will be (a) twice the individual voltages, (b) half the individual voltages, (c) λ/2 times the individual voltages, (d) the same as either individual voltage.

Because of the imperfections already mentioned, the output in common-mode operation is small but not zero. When signals are applied differentially to the amplifier, a high gain results, but unwanted signals such as noise voltages are present at both inputs and present a common-mode input; these signals therefore receive only a very small gain which is something to be desired. However, the amplifier can only separate signal and noise in this way if its common-mode output is negligible, and a measure of the opamp's ability to do this is expressed by a factor known as the Common Mode Rejection Ratio or CMRR.

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