T
treez
Guest

I have an 11 Amp RMS current flowing in a one milliOhm sense resistor (1%).
(its a 1210 size chip resistor)
...this current is amplified by a differential amplifier with a gain of 100, and there are filter capacitors incorporated in the differential amplifier (using OPA335 op amp which has low Vos) so that the amplified output voltage is DC.....(and then this DC output of the opamp is read by an ADC on a microcontroller)
......The 11 Amps current waveshape is of the form of a full wave rectified 50Khz sinusoidal current waveform....so it has a frequency of 100KHz.
.....Do you think skin effect issues will be at large here?......will the 1 MilliOhm resistor act like its a lot more than 1 MilliOhm?
(its a 1210 size chip resistor)
...this current is amplified by a differential amplifier with a gain of 100, and there are filter capacitors incorporated in the differential amplifier (using OPA335 op amp which has low Vos) so that the amplified output voltage is DC.....(and then this DC output of the opamp is read by an ADC on a microcontroller)
......The 11 Amps current waveshape is of the form of a full wave rectified 50Khz sinusoidal current waveform....so it has a frequency of 100KHz.
.....Do you think skin effect issues will be at large here?......will the 1 MilliOhm resistor act like its a lot more than 1 MilliOhm?