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AD8309 Logarithmic Amplifier Envelope delay at VLOG Output

Question asked by sugu89 on Nov 21, 2015
Latest reply on Nov 23, 2015 by jdobler

Sir/Madam,

 

      We are using the 0.625MHz (0.8uS ON and OFF) pulsed RF signal at 30MHz to the AD8309 Logarithmic Amplifier and take the Log envelope output at VLOG pin without any external capacitor at FLTR Pin(default 3.5MHz Video bandwidth).

 

Can you specify this Log detector absolute delay between applied RF input to Log envelope output at VLOG pin for our above signal? Since it has internal video filter it will introduce a delay for the LOG output and we dont know the filter response and order we cant estimate this delay by our calculations.

 

Regards,

Sugumar K

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