THE DESIGN OF A high-voltage isolation amplifier having greater than 160dB isolation mode rejection will be described. Figure 1 shows a block diagram of the complete amplifier. The normally poor linearity and gain drift associated with the optical components has been minimized with feedback. The LED and photodiodes have been arranged so that the same amount of light falls on each photodiode causing the currents generated by the diodes t o match closely. This results in a transfer function that depends upon op…
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