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Robin Clark 2010-10-07 19:37:03 +01:00
parent 4ac851a271
commit 4ec18c0321
1 changed files with 2 additions and 2 deletions
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fmmd_design_aide/fmmd_design_aide.tex
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@ -76,7 +76,7 @@ We then analsye the {\fg} and the resultant {\dc} failure modes are discussed.
\begin{figure}[h]
\centering
\includegraphics[width=200pt,bb=0 0 678 690,keepaspectratio=true]{./mv_opamp_circuit.png}
\includegraphics[width=200pt,bb=0 0 678 690,keepaspectratio=true]{./fmmd_design_aide/mv_opamp_circuit.png}
% mv_opamp_circuit.png: 678x690 pixel, 72dpi, 23.92x24.34 cm, bb=0 0 678 690
\caption{Milli-Volt Amplifier with Safety/Offset Resistor}
\label{fig:mv1}
@ -86,7 +86,7 @@ We then analsye the {\fg} and the resultant {\dc} failure modes are discussed.
This circuit amplifies a milli-volt input by a gain of $\approx$ 184 ($\frac{150E3}{820}+1$).
An offset is applied to the input by R18 and R22 forming a potential divider
of $\frac{820}{2.2E6+820}$. Will 5V applied as Vcc this gives an input offset of 1.86mV.
of $\frac{820}{2.2E6+820}$. With 5V applied as Vcc this gives an input offset of 1.86mV.
So the amplified offset is $\approx 342mV$. We can determine the output of the amplifier
by subtracting this amount from the reading. We can also define an acceptable
range for the readings. This would depend on the milli-volt source, and also on the