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KeepItSimpleStupid
- Joined Mar 4, 2014
- 5,088
The AD711 is an OP amp similar to the TL081.
Are you confusing it with the LM311?
This design was basically by second analog design of all time and it was pretty complx, there is actually 3 dual +-15 V supplies and i think a 5 or 12 V supply. One supply runs an I-V converter (+-100 mA), the other the bias source (+-10V) and the other runs a +-50 mA current source for suppression. It's part of a 2 or 4 terminal selectable I-V converter with bias and suppression.
In 2 and 4 terminal mode, the first IA basically reads the actual voltage across the device.
AG1 and AG4 end up being tied together.
In 2T mode, the AD711 is a unity gain OP amp that controls a 4 quadrant +-100 mA supply made from an LM1010 and OP amp that isolates capacitance.
The DUT was actually a solar cell fed with DC and a chopped monochomatic light source.
In 4T mode, the AD711 servos the above supply such that the DUT has the setpoint voltage across the DUT.
I think what;s happening is the input offset voltage (0.1mV) of the AD711 is going up against a brick wall without the resistor.
Are you confusing it with the LM311?
This design was basically by second analog design of all time and it was pretty complx, there is actually 3 dual +-15 V supplies and i think a 5 or 12 V supply. One supply runs an I-V converter (+-100 mA), the other the bias source (+-10V) and the other runs a +-50 mA current source for suppression. It's part of a 2 or 4 terminal selectable I-V converter with bias and suppression.
In 2 and 4 terminal mode, the first IA basically reads the actual voltage across the device.
AG1 and AG4 end up being tied together.
In 2T mode, the AD711 is a unity gain OP amp that controls a 4 quadrant +-100 mA supply made from an LM1010 and OP amp that isolates capacitance.
The DUT was actually a solar cell fed with DC and a chopped monochomatic light source.
In 4T mode, the AD711 servos the above supply such that the DUT has the setpoint voltage across the DUT.
I think what;s happening is the input offset voltage (0.1mV) of the AD711 is going up against a brick wall without the resistor.
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