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I changed input voltage (V1) parameter and it's like this:
And this is what I receive in AC analysis:
Vout is the voltage of output between R1 and R2. Is it correct?
Sorry for spam, but I think I am close solving problem. This is corrected scheme:
All I have left is to change the ideal diodes to real elements. And further improve the circuit. But now I'm sure the circuit demodulates the fm signal :)
Thank you for the study materials.
Ok, so I want to design ratio detector that would work for such parameters: carrier frequency 98MHz, modulating signal 100kHz and Index Modulation 25 (I have read that most often the modulation index takes values from 10 to 100, of course it can be 1, but...
I corrected my scheme:
and characteristics:
Is the system is ratio detector FM demodulator? It seems to me that I am getting closer to the end of task, but I am asking for good advice and tips.
Initially, I assumed that the demodulator would demodulate a signal with the following parameters: freq signal 10MHz and carrier frequency 90MHz. But it was only preliminary data, then I modified the layout by changing parameter values etc.
At the beginning, I implemented a circuit with an...
I changed the SFFM source to a sine source and added a modulator.
This is how the waveforms look like:
Probably something with the transformer (coils) is wrong.
This diode model is not in LTspice. Is there any replacement?
It may be. I noticed that by changing the induction value of the coils, the amplitude of the signal at the output changes.
Hi All,
The aim of the task is to design a FM demodulator in a ratio detector. I've been trying to do this for several hours but I have a feeling that still isn't it. I am asking for help and suggestions on what should be improved in the system. I also send the layout diagram in LTspice and...
It's my homework and i know it's (maybe) good because my lecturer said the project is ok but now i have to make a simple simulation and i don't know if the voltage source parameters is good or not.
Hi.
I designed a system with an operational amplifier that must meet the following frequency characteristics:
My layout diagram in LTspice
and it's the characteristic:
Should I change the voltage source in the schematic? And what type should I change to? Electronic components and their...
Okay, it's correct electronic circuit:
and it's my assumptions and calculations:
T1 is cut-off and T2 is saturated then output voltage Uwy2 is approximately -1V.
My calculation:
Ucc-Ic*Rc+UBC2=0
UBC2-voltage base-collector on transistor T2
UBC2=0.5V because UCE=UCEsat=0.2V and UBE=0.7V
Then...
I forgot to mention that the system is powered by a current source IE = 1.5mA. And now I noticed that I sent the wrong layout. The following is correct:
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