Hi im new here and I just want to ask something. I found this circuit from the AD8532 datasheet and Im having trouble trying to understand how the circuit really works (from input to the output).
can someone enlighten me on this?
why are there two outputs?
what are the functions of each amp of the circuit?
does the input require a dc or ac voltage?
this is a bal line driver btw
can someone enlighten me on this?
why are there two outputs?
what are the functions of each amp of the circuit?
does the input require a dc or ac voltage?
this is a bal line driver btw
The lefdt A1 is a simple buffer - it is configured for gain = 1 (inverting input conneced to output).
Then there are two A2 opamps that provide the two opposing balanced outputs (one A2 is inverting).
The right A1 sets the DC input to the two A2's to make it sit at half the supply voltage for max signal range.
Makes sense?
jan didden
Then there are two A2 opamps that provide the two opposing balanced outputs (one A2 is inverting).
The right A1 sets the DC input to the two A2's to make it sit at half the supply voltage for max signal range.
Makes sense?
jan didden
what do you mean about making the A2s sit at half the supply voltage for max signal range? sorry I got confused there.
and two more questions pls
I simulated the circuit in multisim and what I got at the output was two waveforms that are not identical to each other. the -vout was larger than +vout. why is that?
and Im supposed to use an AC supply here right?
thank you very much!
The circuit as shown runs on a 5 ? and a 12 volt rail.
The output of the opamps has to sit at half supply so it can go up as well as down. So if it sits at plus 6 volts it can go up as high as 12 and down as low as zero. So you get the maximum voltage swing without either the top or bottom of the signal being clipped.
The two 100k resistors set the "mid point" and generate a 6 volt reference. This appears at the output of the right hand A1
The supplies are DC.
The output of the opamps has to sit at half supply so it can go up as well as down. So if it sits at plus 6 volts it can go up as high as 12 and down as low as zero. So you get the maximum voltage swing without either the top or bottom of the signal being clipped.
The two 100k resistors set the "mid point" and generate a 6 volt reference. This appears at the output of the right hand A1
The supplies are DC.
Oh so if I were to simulate the circuit in multisim, what should I put at the input?
Look at the non-inverting input of the right hand A1. Do you see what kind of voltage that is?
That A1 is configured as a gain-of-one follower, do you see that?
So what is the voltage going to the A2's via R7 and R11?
jan
That should have read
"The two 100k resistors set the "mid point" and generate a 2.5 volt reference"
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