mixer design problem with conversion gain

[mantar]

mixer design problem!!!!

Hi

I am also getting the same problem ....even though i am gettin every thing correct like IP3,1-dB compression point,noise figure..etc. but i am not able to get the conversion gain ...i am getting hat as -79dB or somewhat like that.

But i dont have the matching circuit please tell me the way to design the matching circuit and also some of the ways to increase the gain.

Regards,
Manish.

 

[No one]

Re: mixer design problem!!!!

Hi;
Refer to the book by MAAS.

 

[victoriya]

what type of mixer do you design?
in passive mixer the conversion gain is negative but i think you have a mistake in measuring the conversion gain?
can you post your circuit here?

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[chuckey]

Mixer product of -79 dB is what a linear amplifier does when it has two dissimilar RF inputs. Use more local Osc. power, run the stage into nonlinearity, have an output circuit tuned to the correct frequency.
Frank