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HMC799 output polarity

Question asked by Fitty on Dec 6, 2017
Latest reply on Dec 7, 2017 by Fitty

Greetings,

 

So I stumbled across this integrated trans-impedance amplifier a while back and want to use it as an AC coupled TIA for a PIN or APD receiver. One thing that I noticed about the datasheet is a lack of a detailed block diagram of the internals. Based on my understanding of a basic op-amp based TIA, the current flow direction determines the output polarity. I intend on applying a positive bias and would expect a falling edge type output but when I look at the simplified pin descriptions I see an NPN common emitter stage on the output. What should I expect in terms of output polarity? Maybe I'm just blind and missing something here but I just want to be certain before I go any further with this. 

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