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adl5511 envelope detector impedance

Question asked by cerebrum01 on Dec 22, 2015
Latest reply on Jan 5, 2016 by cerebrum01

Hi,

 

I need to measure the envelope of a damped signal from an oscillator circuit when removing the power (The oscillator use a 10-20 Mhz sine signal - "currier"). I was wondering if I could use the adl5511 to quantify the envelope of this signal. I understand that the 75 ohm shunt resistor is aimed to match the 50ohm impedance, but since the oscillator circuit has (potentially) another impedance, is it really necessary the shunt resistor and capacitor?. What is the worst scenario if the impedance are not matched between the oscillator and the adl5511? does it cause changes in the size or/and the phase(shape) of the signal?.

 

Thanks in advance,

Christian

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