December 2003
Intermediate to advanced
320 pages
9h 28m
English
Content preview from Analog Interfacing to Embedded Microprocessor Systems, 2nd Edition
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The design of the mixer and low-pass filter can be complicated. It is made worse
if the amplitude of the input signal varies as well as the frequency.
.
Finally, the addition of another frequency (the injection frequency for mixing)
complicates the circuit and may produce additional EMI.
Voltage-to-Frequency Converters
One means of converting an analog input to a time value is to use a voltage-to-
frequency (V-F) converter. The block diagram of a V-F converter is shown in
Figure 4.5. A comparator drives a one-shot, which produces an output pulse of
a fixed width when triggered. On one side of the comparator, a capacitor is
charged through a constant ...
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