A PASSIVE SIGNAL ISOLATOR WITH ZERO OFFSET OPERATION

摘要

A passive signal isolator with zero offset operation includes a self-oscillation circuit, a pair of complementary triodes, a DC offset circuit (10), a transformer (L1) and a rectifier circuit (20). One end (1) of the DC offset circuit is connected to the signal input end (Ii+) and the other end (2) and the output end of the self-oscillation circuit are connected to the bases of the complementary triodes. The DC offset circuit includes a capacitor (C103) and a reverse isolating element (D102) connected in series to the capacitor for isolating self-oscillation signals, one end of the capacitor is connected with the input of the current signals, the other end is connected to the positive pole of the reverse isolating element, and its reverse pole is connected to the bases of the complementary triodes.