ANALOG INSULATION/MULTIPLEXER

摘要

It is possible to provide an analog insulation/multiplexer not causing magnetic saturation even when a small-size transformer is used and having a wide use temperature range. The analog insulation/multiplexer includes: a first switching element (FET1) for generating a drive control signal in response to an external signal; a drive insulation transformer (T1) having a primary side to which the drive control signal is applied via a first resistor (R1) and a secondary side to which an insulated drive control signal is outputted; a second switching element (FET2) for chopping the analog signal input in accordance with the insulated drive control signal; and an analog signal insulation transformer (T2) for outputting the insulated chopping analog signal to the secondary side. The analog insulation/multiplexer further includes a secondary side output adjusting circuit (10) having a second resistor (R2) connected to the primary side of the drive insulation transformer (T1) in parallel to the first resistor (R1) and a capacitor (C1) having one end grounded and the other end connected in series to the second resistor.