Antey
New Member
Hello Everybody
So here I am again with request for opinion - this time about another "so-called" design, which is FM modulator (not transmitter !).
As far as I know, my project may seem trivial, my solutions may be found as unproffessional and even funny.
The idea is to make use of PM modulator (attached) which will have integrator connected at it's input and - voila ! - this should result in frequency modulation.
The problem is that the original circut ( found @ **broken link removed** ) is only demonstration which runs @ 1kHz carrier with 50 Hz modulating signal.
What I need is 100 MHz carrier, with 50 kHz deviation and modulation index 15. Because it's NOT going to be a real-life circut - ONLY SIMULATION - so I figured out that it should be enough to select proper OpAmp [EL2045], and adjust other vaules to get the simulation (in SIMetrix) working.
So here are the questions :
- does it have any chance to run at all ?
( I think it has, the output spectrum looks promising...but I have trouble with transients which create enormous peaks @ 0 Hz )
- if my approach looks acceptably what should I change in circut ?
Of course, any other suggestions shall be much appreciated
Best Regards,
Peter
So here I am again with request for opinion - this time about another "so-called" design, which is FM modulator (not transmitter !).
As far as I know, my project may seem trivial, my solutions may be found as unproffessional and even funny.
The idea is to make use of PM modulator (attached) which will have integrator connected at it's input and - voila ! - this should result in frequency modulation.
The problem is that the original circut ( found @ **broken link removed** ) is only demonstration which runs @ 1kHz carrier with 50 Hz modulating signal.
What I need is 100 MHz carrier, with 50 kHz deviation and modulation index 15. Because it's NOT going to be a real-life circut - ONLY SIMULATION - so I figured out that it should be enough to select proper OpAmp [EL2045], and adjust other vaules to get the simulation (in SIMetrix) working.
So here are the questions :
- does it have any chance to run at all ?
( I think it has, the output spectrum looks promising...but I have trouble with transients which create enormous peaks @ 0 Hz )
- if my approach looks acceptably what should I change in circut ?
Of course, any other suggestions shall be much appreciated
Best Regards,
Peter