GSR Posted August 23, 2009 Report Share Posted August 23, 2009 Dear all, I use simple opamp a lot. Recently. I use an AD620 biomedical bipolar opamp as a preamp for EMG circuit. I found out that there is a reference connection, what is the reason for a bipolar amplifier having a reference connection??? Could you please give me some idea? Quote Link to comment
GSR Posted August 23, 2009 Author Report Share Posted August 23, 2009 Dear all, I use simple opamp a lot. Recently. I use an AD620 biomedical bipolar opamp as a preamp for EMG circuit. I found out that there is a reference connection, what is the reason for a bipolar amplifier having a reference connection??? Could you please give me some idea? Please ignore, find solution. Thanks for reading this topic Quote Link to comment
Bobillier Posted August 24, 2009 Report Share Posted August 24, 2009 Hi The ref input may have few using. 1) Connect to the common (gnd in general) you obtein the signal + the offset 2) Connect to a resistor , can compensed the DC CMR error. 3) Connect to a voltage source (few mv) you can compensed the output offset. 4) Connect to the out put of LP Filter you can creat LP instrument amplifier without add input capacitor on AD620 input. 5) Can be used to creat precise current source. Analog Device give you few exempls in their instrument amplifier datasheets. Quote Link to comment
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