Hello,
I am using texas instrument's part number INA2133U and OPA 131 to build the constant current source. The following link will take you to the circuit and data sheet ( page 13, figure 16). The inverting input of the amplifier is grounded.
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I used 10uF capacitor in series with the resistor R to stop DC leakage current and my load has an impedance in the range of 10Kohm to
500kohm. My question is there is a chance that the capacitance offered by the capacitor and the load will stop the current source to shut off and there will be no biphasic wave will pass through the capacitor.
The biphasic waves are bipolar square waves of frequencies between
200Hz to 500kHz. Will it better to minimize the DC leakage using some trimming scheme at the INA2133 or capacitor will be ok?
If such thing capacitance exsists acorss the current source than what will be its value in my circuit and how can I measure it?
The value of R is 50KOhm. The Max Dac voltage is +/- 2. 5 volts peak to peak.
Thanks Regards,
John