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Lokeshloki
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Join Date: Mar 2015
Location: INDIA
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90 Degrees Phase Shift for Input Signal

03/07/2015 10:55 PM

How to get 90 degrees phase shift for an signal practically. We cant use an inductor because it cant give 90 degrees perfect phase shift practically and a capacitor is giving me a 60 degrees only but not 90 so please give suggestions how to get perfect 90 degrees.

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Pathfinder Tags: capacitor delay inductor phase shift
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lyn
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#1

Re: 90 degrees phase shift for input signal.

03/07/2015 11:03 PM

Google gives you about 991,000 results.

We still don't do homework.
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dvmdsc
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#2

Re: 90 degrees phase shift for input signal.

03/08/2015 1:12 AM

It is difficult to give you an answer when you come up with this little info.

A coil- or a capacitor can give you practically 90 degrees when your RC or RL circuit is dimensioned the right way.

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vijay guntimadugu
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#3

Re: 90 degrees phase shift for input signal.

03/08/2015 4:03 AM

no info from me
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Rixter
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#4

Re: 90 degrees phase shift for input signal.

03/08/2015 7:47 AM

Look up Op-amp integrators.
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redfred
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Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

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#5

Re: 90 degrees phase shift for input signal.

03/08/2015 8:35 AM

If the circuit you are trying to use to obtain a 90° phase shift is a single pole filter, then it cannot be done. One must have at least two poles to get a 90° phase shift. An induction motor run/start capacitor circuit is not a single pole filter. The motor is a much more complex impedance than a resistor.

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Kulas
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#10
In reply to #5

Re: 90 degrees phase shift for input signal.

03/18/2015 12:10 PM

I need 3 on mine. Hihihi

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SHOCKHISCAN
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Join Date: Nov 2007
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#6

Re: 90 degrees phase shift for input signal.

03/08/2015 11:28 AM

Here is a link to an excellent article on phase shifting control.

http://www.edn.com/design/analog/4326825/Microcontroller-controls-analog-phase-shifter

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WoodwardDL
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#7

Re: 90 Degrees Phase Shift for Input Signal

03/09/2015 12:51 PM

What is the application?

What is the Frequency?

What is the power level?
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Lokeshloki
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Join Date: Mar 2015
Location: INDIA
Posts: 49
#8
In reply to #7

Re: 90 Degrees Phase Shift for Input Signal

03/11/2015 11:03 AM

1khz, 5v, current in some milli amps

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WoodwardDL
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#9
In reply to #8

Re: 90 Degrees Phase Shift for Input Signal

03/11/2015 12:16 PM

Here is an audio frequency phase delay device for $ 100. You should use a two channel scope to assure that the delay is precisely 90 degrees.

http://www.uaudio.com/store/special-processing/little-labs-ibp.html
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Lokeshloki
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#11
In reply to #9

Re: 90 Degrees Phase Shift for Input Signal

03/19/2015 12:25 AM

Iam asking the circuit.

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WoodwardDL
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#12
In reply to #11

Re: 90 Degrees Phase Shift for Input Signal

03/19/2015 11:37 AM

Using BING, I found this circuit diagram. I would substitute variable R and C in the

output stage to get a tunable delay.

http://www.simplecircuitdiagram.com/2011/02/04/single-transistor-variable-0-180-deg-phase-shifter/
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12 comments

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Users who posted comments:

dvmdsc (1); Kulas (1); Lokeshloki (2); lyn (1); redfred (1); Rixter (1); SHOCKHISCAN (1); vijay guntimadugu (1); WoodwardDL (3)

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