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Questions about AD831

Question asked by juliomh on Mar 4, 2014
Latest reply on Mar 5, 2014 by jdobler

Hello, I am using the AD831 in my design, WITHOUT using the internal amplifier (using the differential current output) and I have a couple questions.

 

1. The internal gain indicated in the datasheet (pi/2) is provided by the gilbert cell or the output amplifier?

 

2. What is the maximum load resistor I can put in the differential output for correct biasing of the AD831 internal transistors? (I am using the lowest bias current) For example other gilbert cell mixers establish a minimum Vce of 2V for a correct operation.

 

Thanks.

Julio Martin-Hidalgo

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