Frequency to voltage

[m-a-r-i-n]

Hy there,i' need help to create some project. I must create frequency to voltage converter in electronic workbench and simulate. In workbench i have analog IC-s
operational ampifflier and monostabile, but i dont have already made IC frequency to voltage converter. Frequency to voltage converter is primary part of the project,
other part-s is easy to create...so i need help to create frequency to voltage
converter with components in EWB 5... ??? ???

 

[AN920]

Here are some hints:-

Square up your input frequency
Apply to the monostable to get fixed pulse width on every cycle
Filter the pulses with a low pass filter
Scale and calibrate output with opamp if needed

Voltage reading should be proportional to applied frequency

 

[m-a-r-i-n]

Thanks on help I have build frequency to voltage converter with operational amplifier and works  really good.

View attachment 40217

 

[AN920]

Good! I see you used an integrator to give you proportional voltage according to pulse width. Then it looks like you inverted this and scaled it with your last opamp. There are many ways to do this. Some methods will give you very good linearity and other not so well. It appears that you operate at low frequencies?

 

[m-a-r-i-n]

>It appears that you operate at low frequencies?

yes, the range of frequencies is 30-100Hz

View attachment 40230