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Gain curve using the …
Gain curve using the mechanical pot is identical to Dpot with negative resistance R
W
compensation
Authors
Stephen Woodward
Main Document
Article «
Digital pot can control gain over a 90 dB span like an electromechanical
»
Description
Figure 5
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PDF
/
7 Kb
Document Language
English
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Other Materials from the Main Document
Article «
Digital pot can control gain over a 90 dB span like an electromechanical
»
Figure 1. Grounded wiper makes R2 serve as both input attenuator and output gain set
Figure 2. R2 has the same function as in Figure 1 with DC bias from R4R5C2 to accommodate bipolar signals. But what about R
W
wiper resistance effects?
Figure 3. Positive and negative feedback loops around A2 combine to create active negative resistance = -R4
Figure 4. Red curve plots uncompensated R
W
(~150 Ω), note the 20 dB loss from both ends of the span. Black curve plots the case where R
W
is compensated with negative resistance (R4 = R
W
= 150)
Figure 5. Gain curve using the mechanical pot is identical to Dpot with negative resistance R
W
compensation
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