CURRENT TO VOLTAGE CONVERTER FOR GROUNDED LOADS
CURRENT-TO-VOLTAGE CONVERTER FOR GROUNDED LOADS
iLoad=^s
R*
Load
T
This Circuit uses an Analog Devices AD830 video difference amplifier. The Circuit consists of two differential inputs. Unlike a conventional op amp, the AD830’s output is nulled when the sum of the differences of the two inputs is zero.
The AD830’s stated unity-gain bandwidth is 60 MHz, and the device is capable of driving up to ±30 mA directly. The differential input voltage is limited to ±2 V, while the maximum power supply is ±15 V.
If morę output current is desired, the AD830 can drive a bipolar transistor (such as an MJE200) directly. This will produce a one-sided output.
A ferrite bead can be placed on the base to prevent oscillation under some conditions. Com-pensation can be added by splitting Rs and adding a variable capacitor. A resistor can be po-sitioned at the input to match the amplifier’s input to a transmission linę.
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