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📁 Input/Data Acquisition System Design for Human Computer Interfacing
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.2//EN"><!--Converted with LaTeX2HTML 96.1 (Feb 5, 1996) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds --><HTML><HEAD><TITLE>4.4 Current to Voltage</TITLE><META NAME="description" CONTENT="4.4 Current to Voltage"><META NAME="keywords" CONTENT="sensors"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><LINK REL=STYLESHEET HREF="sensors.css" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/sensors.css"></HEAD><BODY BGCOLOR="#FFFFFF" TEXT="#000000" LANG="EN"> <A NAME="tex2html248" HREF="node17.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node17.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="next_motif.gif" tppabs="http://ccrma.stanford.edu/Images//next_motif.gif"></A> <A NAME="tex2html246" HREF="node12.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node12.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="up_motif.gif" tppabs="http://ccrma.stanford.edu/Images//up_motif.gif"></A> <A NAME="tex2html240" HREF="node15.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node15.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif" tppabs="http://ccrma.stanford.edu/Images//previous_motif.gif"></A>   <BR><B> Next:</B> <A NAME="tex2html249" HREF="node17.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node17.html">4.5 Resistance to Voltage</A><B>Up:</B> <A NAME="tex2html247" HREF="node12.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node12.html">4 Signal Conditioning</A><B> Previous:</B> <A NAME="tex2html241" HREF="node15.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node15.html">4.3 Voltage to Voltage</A><BR> <P><H2><A NAME="SECTION00044000000000000000">4.4 Current to Voltage</A></H2><P><H3><A NAME="SECTION00044100000000000000">4.4.1 Motivation</A></H3><P>Some sensors output a current rather than a voltage.  The most common sensor of this 
type is the photodiode which has a current output proportional to the amount of light 
shining on it. The purpose of the signal conditioning circuitry is to convert the current 
output of the sensor to a voltage.<P><H3><A NAME="SECTION00044200000000000000">4.4.2 Circuits</A></H3><P>In converting a current to a voltage, one usually uses an inverting amplifier configuration, 
since a non-inverting amplifier draws very little current. Figure&nbsp;<A HREF="node16.html#rect7b" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node16.html#rect7b">31</A> shows a current 
amplifier connected to a photodiode.  Notice that the circuit is identical to the non-
inverting amplifier with the input resistor removed. As the light increases, the current 
output of the photdiode increases, increasing  <IMG WIDTH=23 HEIGHT=16 ALIGN=TOP ALT="tex2html_wrap_inline1972" SRC="img81.gif" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/img81.gif"  >  proportionally:
 <IMG WIDTH=56 HEIGHT=16 ALIGN=TOP ALT="tex2html_wrap_inline1974" SRC="img82.gif" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/img82.gif"  > <P><P ALIGN=CENTER><A NAME="772">&#160;</A><A NAME="rect7b">&#160;</A> <IMG WIDTH=215 HEIGHT=107 ALIGN=BOTTOM ALT="figure771" SRC="img83.gif" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/img83.gif"  > <BR>
</P>
<STRONG>Figure 31:</STRONG> Photocell Connected to a Current Amplifier <BR><P><BR> <HR><P><ADDRESS><I>Tim Stilson <BR>Thu Oct 17 16:32:33 PDT 1996</I></ADDRESS></BODY></HTML>
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