Pulse generation with variable frequency

Hi everyone

I am trying to implement a pulse generator that generates pulses with variable frequency; let's say teh frequency is varying from 90kHz to 110 kHz; the pulse generation block only has fixed frequency.

Also, it is important to maintain the duty cycle 50%, which means giving 90to110 kHz to a sine block and comparing it to zero would not work (as far as I know by trying it)>

I would appreciate if anyone has any idea on this matter.

Answer 1

[Mathieu NOE]

hello

it's a matter of how you implement the idea

here one solution

the attached model is a fixed step euler simulation

you have to initialize dt = 1e-7 in your workspace first

for the demo I have amplified the variable amount of the frequency

the graph below shows frequency, angle and output signal (as expected)

[Mathieu NOE]

hello again

If my submission fullfills your request, do you mind accepting it ?

tx

[Nandhini]

For the above circuit i need to vary the Ton and Toff time period for each cycle without changing the duty cycle is possible... Because 2 or 3 cycles having the same time period.. I need random pulse without changing the frequency... Could you please help me

[Mathieu NOE]

I am not sure to understand how you can have random pulse with fixed constant frequency

[Nandhini]

Need to main the duty ratio.. it may be +/- 1/3 of the desired frequency.. still i am trying to produce a pulse signal like that.