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International Electronics and Technology Forum > Analog and Mixed Signal > Electricity and Analog Electronics > 

frequency to voltage conversion?

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Author Topic: frequency to voltage conversion?  (Read 275 times)
Shravan_IV
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Posts: 2
« on: July 04, 2011, 04:10:00 PM »
what does it actually mean by frequency to voltage conversion and vice-versa..
what is its significance.??

is it same as conversion from ac to dc ?
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Chris_Pitchr
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Posts: 5
« Reply #1 on: July 29, 2011, 06:33:53 PM »
It just means something where the output voltage is proportional to the frequency of an input signal. It is nothing to do with ac/dc conversion in the normal sense.

The sort of thing it might be is a special circuit designed to measure frequency and which supplies a voltage output so that this can be used to control other stuff or drive a display meter.
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DAVID_H
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Posts: 21
« Reply #2 on: July 30, 2011, 07:48:53 AM »
Let me start off by telling you that the units of frequency and those of voltage are not the same! You cannot convert frequency to voltage.
Now the AMPLITUDE of an ac voltage signal is measured in volts. It can be measured as a peak to peak value or as an rms value. Is that what you mean?
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jimmymae2000
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Posts: 13
« Reply #3 on: August 01, 2011, 02:41:46 AM »
No, it's not ac to dc. Rather is a way to recover an intelligence signal from off a carrier (FM Modulated) wave, usually radio frequency. When you listen to FM Radio the program Information was placed on two sub-carriers (Left. and rt. channel) and then modulate the radio station broadcast frequency. The modulation / demodulation technique depends on voltage to frequency and the reverse process.
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__0___f_t_e___st_d
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Posts: 7
« Reply #4 on: August 01, 2011, 02:59:26 AM »
It's a method of measuring a variable frequency or generating a variable frequency.  It's not the same as ac/dc conversion.

Generally frequency to voltage conversion can be done using the edge of a frequency filter band -- if the filter cuts off near 1 kHz, then a signal that is near 1kHz but varies from, say, 0.9kHz and 1.1kHz will vary in voltage as well as frequency.

Voltage to frequency conversion is a lot more complicated, but it uses something called a voltage controlled oscillator.  It involves a lot of nonlinear and feedback electronics, so it's harder to explain in words, but the frequency it outputs depends on the voltage input.
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