90 Degree Phase shifted square wave

Thread Starter

Amol Sakhale

Joined Jun 12, 2015
5
I want to make one circuit in which i need to vary the frequency with voltage and also have to produce 90 degree phase shifted same square pulse.
That phase shifted pulse must also change it's frequency with first wave's frequency.
Not getting how to do exactly.
Thanks :)
 

ericgibbs

Joined Jan 29, 2010
12,456
If the linked project meets your requirement, it would be easy to raise the 5V voltage level output from the PIC to 15V by using a couple of general purpose transistors.
[you would obviously require a 15V power supply]
 

crutschow

Joined Mar 14, 2008
26,977
You start by generating a double-frequency 50% duty-cycle square-wave.
Have one toggle flip-flip trigger off the rising edge.
Have a second toggle flip-flop trigger off the trailing edge.
The output from the two flip-flops is two signals at the desired frequency with a 90° shift between them.
 

Thread Starter

Amol Sakhale

Joined Jun 12, 2015
5
Thank you very much for your concern :)
It will be better if that circuit will not based on any micro-controller and will consist of normal opams, transistors and some ICs.
 
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