J
john
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.
http://focus.ti.com/lit/ds/symlink/ina2133.pdf
I tested the circuit for Leakage current and with zero input
voltage ,
load resistor of value 100kohm, R = 50kohm and rail voltages of +/-
15volts, I am getting current in the range of 1 to 10 micro amp,
which
is undesirable for my application. The questions are as follows
1. Do I need offset trimming like the data sheet discussed it on page
number 9?
2. Is there any other way to stop this leakage current?
The desirable leakage current range is less than 1 micro amp.
Please advice!
John
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.
http://focus.ti.com/lit/ds/symlink/ina2133.pdf
I tested the circuit for Leakage current and with zero input
voltage ,
load resistor of value 100kohm, R = 50kohm and rail voltages of +/-
15volts, I am getting current in the range of 1 to 10 micro amp,
which
is undesirable for my application. The questions are as follows
1. Do I need offset trimming like the data sheet discussed it on page
number 9?
2. Is there any other way to stop this leakage current?
The desirable leakage current range is less than 1 micro amp.
Please advice!
John
