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Having issues getting the same results

Discussion in 'Radio and Wireless' started by mechorigin, Jan 13, 2022.

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  1. mechorigin

    mechorigin

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    Jan 13, 2022
    Good day everyone, this is my first time here and first post!

    I thought I'd try and see if someone can help me dig into this circuit a bit and figure out why and how the selected inductor/capacitor matches were selected.
    I noticed the two frequencies selected are around 900mhz and 2.2ghz. As well as the diodes have an internal capacitance of 0.18pF each at the operating conditions in the picture below. (3uA, 25ohms)

    For the life of me I can't figure out how the 2 coils and capacitors were selected.
    Even plugging in the angular frequency of 1/sqrt(Cc*Coil) wouldn't yield the proper frequency. The angular f formula for the 900mhz portion (39nH, 2.7pF) only yeilds roughly 490mhz for me.

    1.PNG 2.PNG
     
    Last edited: Jan 13, 2022
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