Analog Signal Attenuation

<p>I have a circuit with two stages.&nbsp; The first stage generates an analog signal varying in the range of 0V to 5V.&nbsp; The output impedence of this stage is about 100 ohms.&nbsp; This is fed into a second stage with an input impedence of about 8K ohms.&nbsp; What I'd like to be able to do is add a state in the middle such that the signal voltage is cut in half.&nbsp; That is, the signal is linarly mapped onto a 0V to 2.5V range.&nbsp; Initially, I thought I need to design this intermediate stage with an input and output impedence matching that of the existing two stages.&nbsp; That is my intermediate stage would have input and output impedences of 8K and 100 ohms.&nbsp; Naively I suppose I could just put a pot in there as a voltage divider and the user can adjust appropriately to their needs, so to speak.&nbsp; Is that the right approach?&nbsp; If that is the right approach, then how would I go about reasoning the value of the resistors in the divider (i.e. a good value for the center tapped pot).&nbsp; Does this make sense?&nbsp; I'm open to any approach, including those involving semicondutors.</p>

I think this will work...

  Joined February 12, 2018      696
Monday at 02:11 PM

jaksonlee

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Attenuation is a general term that refers to any reduction in the strength of a signal. Attenuation occurs with any type of signal, whether digital or analog. Sometimes called loss, attenuation is a natural consequence of signal transmission over long distances.
In conventional and fiber optic cables, attenuation is specified in terms of the number of decibels per foot, 1,000 feet, kilometer, or mile. The less the attenuation per unit distance, the more efficient the cable.

 

  Joined November 07, 2019      124
Thursday at 04:25 PM