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DS90UB953-Q1: Power over Coax for DS90UB953-

ratheesh chandran
Intellectual 805 points
Part Number: DS90UB953-Q1

Tool/software:

Hello Experts,

In Power over Coax we have a resistor in parallel to the inductor. What is the exact purpose of this resistor.?

My understanding: Since it is in parallel, the Q factor is given by R / XL, so when there is no resistor there is peaking at resonance which means that Q is higher as the resistor is reduced we have a reduced peaking so the Q is reduced.

So I assume the purpose of the resistor is to reduce the gain of the inductor at resonance by reducing the Q factor. Is it right ?

I also read in some documents not able to recollect the document name, that this resistor will increase the Q factor.

Please clarify?

regards

Ratheesh

  • 0
    TI__Mastermind 26240 points

    Hello Ratheesh,

    Thank you for your question. Yes, the parallel resistor is used to tune the Q factor. The addition of the resistor will lower the max impedance of the inductor and widen the bandwidth/range of frequencies included under the high impedance. This allows a high impedance to be achieved across a greater frequency range.