An engineer at BEL, Bangalore raised this query. I am trying to get an answer for him and if possible find the right support persons.
"This is regarding a module we are realising using the ICs AD847 & AD843SE/883B Problem Brief : The AD843SE & AD 847 IC's are configured as High speed Peak Detetor circuit exactly as shown in the datasheet of AD843 (Figure 29. A Fast Peak Detector Circuit. ) http://www.analog.com/media/en/technical-documentation/data-sheets/AD843.pdf The circuit is working fine at lab conditions and RT of 23 Deg C. But when tested at -30 deg C the output of the second stage ie. AD843 output is going high with input signal low. Could you help us with resolving this issue, with you / your appln. teams experience. "