Differential matching of AD5356 dual mixer on CN-0140

Hi all,

I am designing a dual IF receiver and studying the Circuit From The Lab 0140 which is indeed very interesting for me. Maybe someone could explain how the two matching networks between Mixer/SAW filter/VGA have been calculated as I cannot get such values with the Analog Devices RF impedance matching calculator nor with mine.

The network between Mixer/SAW filter is a high-pass (right?) but according to my calculations those values are beyond the freq of interest (which is 153.6MHz).

Could someone shed some light on that?

Cheers,

Michele

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  • Dear CarlosC,

    Thanks a lot for the guide on the circuit, it is very detailed and I appreciate your effort. Naturally, I read a similar description on the Circuit Note itself.

    If I understand correctly, the RF impedance matching calculator offered by Analog Devices can only offer values to be considered as guidelines... nevertheless I could not manage to have something similar to the CN. Would you be so kind to post a screenshot of how you would use (and the result it would give) the tool for the maching between Mixer and SAW, and between SAW and VGA? At least I would be able to verify if I used it correctly.

    Is then ADS the only way or could you recommend a cheaper option?  I use RFSIM99 and calculate the matching using the single ended assistant and considering 1/2 on parallel branches of the network but could not get values similar to the ones on the CN.

    Thanks a lot anyway,

    Michele

Reply
  • Dear CarlosC,

    Thanks a lot for the guide on the circuit, it is very detailed and I appreciate your effort. Naturally, I read a similar description on the Circuit Note itself.

    If I understand correctly, the RF impedance matching calculator offered by Analog Devices can only offer values to be considered as guidelines... nevertheless I could not manage to have something similar to the CN. Would you be so kind to post a screenshot of how you would use (and the result it would give) the tool for the maching between Mixer and SAW, and between SAW and VGA? At least I would be able to verify if I used it correctly.

    Is then ADS the only way or could you recommend a cheaper option?  I use RFSIM99 and calculate the matching using the single ended assistant and considering 1/2 on parallel branches of the network but could not get values similar to the ones on the CN.

    Thanks a lot anyway,

    Michele

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