Densitometer with improved accuracy
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United States of America Patent
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Issued Date -
Feb 27, 2003
app pub date -
Jun 15, 2001
filing date -
Jun 15, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method and apparatus for preventing voltage swings within device outputs from reading output node where swings in excess of certain voltages can harm electronics attached to the output node. Specifically, output swings from devices performing logarithmic operations are prevented from reaching the input of an A/D converter, thereby protecting the A/D converter from the large swings possible in logarithmic outputs. A comparator circuit compares the output from the logarithmic amplifier against a threshold and engages the switching mechanism once the threshold is reached. Once the switching mechanism is engaged it applies a predetermined voltage to the output node in place of the true output voltage from the logarithmic amplifier.
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