Schematic of 90 degrees phase shifter form 100khz to 4MHz

[simo]

90 degres phase shifter

hi
i need a 90 deg phase shifter schematic from 100kh to 4 MHZ.
please if you have it guys let me have it.
thanks you very much

 

[Tornado]

Re: 90 degres phase shifter

Check this:

**broken link removed**

Tornado

 

[simo]

Re: 90 degres phase shifter

thanks you
but i need a schematic base on op amp
thanks guys

 

[Tornado]

Re: 90 degres phase shifter

Can it be digital?

Tornado

 

[simo]

Re: 90 degres phase shifter

no problem if it is digital
thank you

 

[xgoat]

Re: 90 degres phase shifter

You could use an integrator (a.k.a. ramp generator) op-amp circuit. That would give you a wave that's 90 degrees out of phase with the input i think.

 

[Tornado]

Re: 90 degres phase shifter

The input signal is it sine or square wave, what is the level?
Is it a constant level or variable?

Tornado

 

[flatulent]

Re: 90 degres phase shifter

The famous "Electronic Filter Design Handbook" by Williams and later editions by Williams and Taylor has an entire chapter on this with tables of pole and zero placements and passive and active circuits to implement them. This book is probably available in electronic format somewhere.

Can someone post a link or upload the quadrature phase shift chapter?

 

[alphi]

Re: 90 degres phase shifter

RLC meter have a signal and a 90 phase shift signal,it is come from high square wave,then use divider to get 90 phase shift.

 

[Tornado]

Re: 90 degres phase shifter

Another solution is a PLL after the filter the phase shift is always
90 degrees.

Tornado

 

[Borber]

Re: 90 degres phase shifter

If I am wright you need constant phase shift of 90 degree in all frequency band. It can be realized with two chains consisting of allpass filters (op amp) that have constant phase diference of 90 degree. Here is example of such a circuit.

 

[artem]

90 degres phase shifter

Digital implementation is quite simple , but you need 2 times more freq input to this circuit . Use 2 triggers to divide by 2 the input freq with differences that :
- first trigger will process on rising edge
- and second on falling edge of input freq

Trigger outputs will be 90 degree phase shift .