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Converters:
Period to Voltage
Converters -- Main
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Last Updated on:
Saturday, June 27, 2009 04:42 PM |
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| Circuits
Designed by Dave Johnson, P.E. : |
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PULSE PERIOD TO VOLTAGE CONVERTER
This is a test circuit converts a square wave input signal into a voltage.
But, the voltage produced is proportional to the time between edges (period) of
the signal, not the frequency. The range is from 100uS to to 10mS, which
produces a voltage from 100mV to 10 volts. Other scale factors are also
possible. The circuit is powered from single 15v supply and uses inexpensive
parts. It is great when a signal's period instead of its frequency needs to be
monitored.
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Links to electronic
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555 Makes handy Voltage to time
Converter: 02/01/01 EDN-Design Ideas / (added
05/03) The circuit in Figure 1 is a simple, low-cost voltage-to-time converter
using the ubiquitous 555 timer chip. You can use the IC's monostable multivibrator
as a voltage-to-time converter by connecting the analog-voltage input to the
charging resistor, R, instead of connecting R to VCC. With this modification, the
timer chip's output-timing cycle, tP, is proportional to the input voltage, VIN.
When you apply an input voltage, the voltage across capacitor C charges
exponentially according to the formula VC=VIN(1–et/RC), where RC is the time
constant of the circuit, with C in farads and R in ohms. During one time constant,
the voltage across the capacitor changes by approximately 63% of VIN. The output
timing of the monostable multivibrator is tP=1.1 RC. By keeping RC constant with
fixed R and C values and varying the input voltage, VIN, you obtain variable
output timing. The output pulse width in this circuit is inversely proportional to
the input voltage.... |
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Circuit Converts Pulse Width to Voltage #2: 10/28/99 EDN-Design Ideas / (added
1/04) -- PDF contains multiple circuits - scroll to find this circuit. --- The
circuit is optimized for a positive-going pulse width of1 to2 msec, repeating at
intervals of approximately17 msec. The output produces a voltage of0.95V for
a1-msec pulse to2.25V for a2-msec pulse. |
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Circuit Converts Pulse Width to Voltage: 10/25/01 EDN-Design Ideas / (added
1/04) The circuit converts pulse information to a clean dc voltage by the end of a
single incoming pulse. In another technique, an RC filter can convert a PWM signal
to an averaged dc voltage, but this method is slow in responding. Converting
low-duty-cycle pulse information is slower yet. |
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