Circut of frequncy discriminator, which works at S BAND

hi guys !! can some one help me to get the circut of frequency discriminator which works at S BAND ( 2-4 GHZ)..

I want it to simulate the circut in ADS

Hi milli.
I have a similar problem - to find GHZ frequency discriminator and model it in ADS.
Did you find any solution ? What circuit topology did you use?

Thank you.

For several decades, IFM (Instantaneous Frequency Measurement) systems have relied on the delay line discriminator circuit.

You can assemble something fairly simply from components that you can buy from MiniCircuits.

First of all put your signal through a limiting amplifier then drive a power divider with the output, one leg of the power divider then feeds the RF port of a schottky diode ring mixer and the other leg feeds the LO port of the mixer through a suitable delay line (some semirigid cable should work well). The mixer functions as a phase detector and the IF output of the mixer will, when filtered suitably, give an S shaped frequency vs voltage curve.

If you look on the Triquint website you can find some classic papers from Watkins-Johnson that give information on using mixers as phase detectors, MiniCircuits have an app note on this subject too I believe.

Thnx , OldRFguy
I look for discriminator for phase frequency detector in X-band PLL .
Is your design suitable for MMIC technology? What element could replace the delay line in the integrated circuit?
Do you know other circuit topology suitable for IC at this frequency?

Ilia

The shunt R and C can conduct delay function.