However, the representation of a passive transducer converting between analogous variables ( for instance an effort variable to another effort variable in the impedance analogy ) can be simplified by replacing the dependent generators with a transformer.
2.
For instance, assume an amplifier has a noise temperature 870 K and thus a noise figure of 6 dB . If that amplifier is used to amplify a source having a noise temperature of about room temperature ( 290 K ), as many sources do, then the insertion of that amplifier would reduce the SNR of a signal by 6 dB . This simple relationship is frequently applicable where the source's noise is of thermal origin since a passive transducer will often have a noise temperature similar to 290 K.
मोबाइल