- For The Next Questions Consider The Following Simple Amplifier Chain Si Gi G2 So Nf Ne For Amplifiers With Noise Fi 1 (22.52 KiB) Viewed 31 times
- For The Next Questions Consider The Following Simple Amplifier Chain Si Gi G2 So Nf Ne For Amplifiers With Noise Fi 2 (37.16 KiB) Viewed 31 times
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For the next questions, consider the following simple amplifier chain: si GI G2) So NF NE = For amplifiers with noise figures NF1 = 0.025 dB and NF, = 0.7 dB, respectively, calculate the gain G1 required for amplifier 1 to make sure that the two amplifiers' added noise are balanced (equal). Give your answer in dB to 1 decimal place.
There are two parts to this question. Please include your working, either as text, or as an image file. [Partial marks will be awarded for this question] In the above measurement chain, assume that the SNR within the target measurement bandwidth at the first amplifier is 10 (that is, after taking the noise from amplifier 1 into account). Setting the amplifier 1 gain to the value you calculated would match the added noise contributions from the two amplifiers (in the previous question), calculate what the SNR is after the second amplifier [Hint: Assume that the added noise from amplifier 1 is the dominant noise contribution in the initial SNR.] (ii) What final SNR could you achieve if you increased the (power) gain of amplifier 1 by 20dB above this balanced value?