If a signal is measured to have volts, what is the difference in dB if it is expressed in dBm referenced to as opposed to being referenced to ?
A sinusoidal signal of 150 mV rms is in series with a noise voltage.
a. If the noise voltage is 1 mV rms, what is the signal to noise ratio expressed in dB?
b. If a SNR of 70 dB is desired, how small must the noise voltage be made?
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