The diagram of phase shifter which gives 90 degree phase shift

Looks the same as the other question I have right now answered.
Remember that usually the lenght and the accurancy of an answer is directly proportional to the number of words spent for the question.

Mandi

for RC ckt, phase angle is inv.tan(RC)..SO PICK RC according to that...correct me if i am wrong....

quarter wavelength transmission line...

(but I agree with FANT and think you are just posting to get points as your question is not inteded to get any answer of real practical value.)

flyhigh

Hi
which type of phaseshifter using? For lumped element phase shifter which is switched line phase shifter . formulas to calculate L & C Values are as follows.
L=Z0/2*Pi*f & C=1/2*Pi*f*Z0
L & C values for getting phase shift other than 90degree can be calculated by different formulas described for High pass & Low Pass Section.
You can refer"Inder Bahl " Book(Chapter 12) for Lumped element design.