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Questions on the feedback loop of THS4303

Jason Mou
Prodigy 120 points
Other Parts Discussed in Thread: THS4303

Dear All,

I have one question on the feedback loop of THS4303.

I want use THS4303 to realize a negative inductor. The feedback loop between the output port and the Vin+ port of THS4303 consists of a capacitor and an inductor. 

My problem is

Is the capacitor necessary for DC decoupling ?

Thanks !

  • 0
    TI__Genius 13935 points
    Hi Jason,

    Are you asking about the 300nF capacitor in series with the 100nH inductor?

    If so, yes that capacitor is necessary, otherwise there will be positive feedback at low frequencies and the circuit would be unstable.

    That capacitor has nothing to do with DC coupling the signal path.

    Regards,
    Loren