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Delay line phase noise discriminator

Question asked by RF_ENG001 on Apr 17, 2020

I am making a phase discriminator ADS.

 

I am using phasenoise modulator to add phase noise to my vco. Then using discriminator I should be observing the

phase noise at the output of mixer. The time delay should be set in order to have quadrature mixing. That is why

td * wo = pi/2

 

However, I cannot get a correct spectrum for output voltage of mixer.

 

The first figure is my phase noise in baseband after demodulation.

The second figure is the discriminated phase noise using a delay line and mixer (Vout of mixer).

 

Where do I make a mistake ?

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