Any ideas of how to implement a CMRR measument of a diferential input analog circuitry ? Attached an ideia of IEC 602268-3 using 3 relay where " output amplifier " would be the Discovery Analog 2 and XLR the input connector of the DUT analog circuitry ( 2+ / 3- and 1 ground ) . Three measurements are done automatically by controlling the relays 1) Differential mode with 10R resistor / 2) Differential mode without 10R resistor / 3) Common mode and output of the analog circuitry is done the worst result express on dB is considered a valid one
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Fabio FZ
Any ideas of how to implement a CMRR measument of a diferential input analog circuitry ? Attached an ideia of IEC 602268-3 using 3 relay where " output amplifier " would be the Discovery Analog 2 and XLR the input connector of the DUT analog circuitry ( 2+ / 3- and 1 ground ) . Three measurements are done automatically by controlling the relays 1) Differential mode with 10R resistor / 2) Differential mode without 10R resistor / 3) Common mode and output of the analog circuitry is done the worst result express on dB is considered a valid one
CMRR ( dB ) = 20log( Gain / Gain CM )
rgds
Fabio
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