 Problems with a circuit prototype for voltage clamping amp with 1 gain based on AD8036 amp.
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tarakan2
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Registered Member #3859
Joined: Sun May 01 2011, 03:47PM
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Posts: 179
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Here is the thing:
The amp is supposed to give out 0 volts when i attach the input to the ground and when i don't attach it to anything.
It doesn't happen in the second case. Not at all.
When I attach it to a +3 line it shows 1.8, when i cut the input off, i get 1.4v, when I attach to the ground, I get 0.4V and when I attach to the -3, I get a value around zero, becaue the low limit for the woltage cuts the output off at a value near 0.
If I remove the feedback resistor, the amp starts to output 3v when I attach it to 3v line and shows -3v when i attach it to -3v line.
All measurements are made with reference to the "ground" between -3 and +3 rails.
Connecting +3V and the -input through a variable resistor doesn't seem to do anything either.
I am totally lost and I don't understand why this circuit works lopsided and doesn't have the gain of 1.
Page 17 of  datasheet.
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tarakan2
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Registered Member #3859
Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179
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got it to work less lopsided
not sure why the input of 3V gives out about 1.5v on the output
Is unity gain considering amp losses?
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