- Published in issue 12/1992 on page 48
Low-noise amplifier I:
One way of desigining a low-noise amplifier is the shunting of several input stages. This reduces the overall noise, Un=U(i)n-1/2, where Un is the total noise potential of n stages: Ui is the noise voltage of one stage: and n is the number of stages. This design is entirely feasible because noise is a randomly composed signal. Therefore, the noise signals of a number of stages at any one moment are highly likely to have a diferent frequency and phase, so that they partly neutralize one another.