The invention relates to an analog isolation device (100) comprising a primary part (102) and a secondary part (104) separated by an electrical isolation barrier, these parts including a high-frequency channel configured to produce a high-frequency component in the secondary part and a low-frequency channel configured to produce a low-frequency component in the secondary part, in order to form the output signal from the high-frequency and low-frequency components. The device further includes a control circuit (D1, 132) configured to receive, in the primary part, a setpoint signal (Sic) and a so-called image signal (Soim) representative of the output signal (So) and to apply in the high-frequency and/or low-frequency channel a correction signal (VCOR) as a function of the difference between the image signal and the setpoint signal in order to cause that difference to tend toward zero.