#### xpassionzxc

##### New Member

Hello,

I'm currently trying to test the current of my dc-dc boost converter across a 0.1 ohms resistor.

I've tried an op-amp called

In terms of slow, the waveform has a phase shift at the output of the op amp as compared to the current probe.

May I ask if anyone has a better Operational Amplifier that they can recommend to measure the current across a circuit?

Circuit of my boost converter.

The 0.1 ohms resistor is placed before L2. So the op amp will measure the value(voltage) across the resistor using the differential configuration of an op amp.

My MOSFET runs at 30Khz.

-Supply Voltage for Op amp can range from +-15V.

-Gain of 10 at the output to reproduce the current measurement. (Since 0.1ohms resistor is being used)

Thank you

I'm currently trying to test the current of my dc-dc boost converter across a 0.1 ohms resistor.

I've tried an op-amp called

*uA741*Operational Amplifier. However, I felt that it is too slow and its quite noisy at the output.In terms of slow, the waveform has a phase shift at the output of the op amp as compared to the current probe.

May I ask if anyone has a better Operational Amplifier that they can recommend to measure the current across a circuit?

Circuit of my boost converter.

The 0.1 ohms resistor is placed before L2. So the op amp will measure the value(voltage) across the resistor using the differential configuration of an op amp.

My MOSFET runs at 30Khz.

-Supply Voltage for Op amp can range from +-15V.

-Gain of 10 at the output to reproduce the current measurement. (Since 0.1ohms resistor is being used)

Thank you

Last edited: