Patent ID: 6720816
Filing Date: 2004-04-13
Classification: H03K,H04L

Abstract:
A circuit configuration for potential-free signal transmission, comprising:a transformer having two windings magnetically coupled to one another, said two windings including a primary winding and a secondary winding; a drive circuit connected upstream of said primary winding and converts edges of a logical input signal into primary-side pulses corresponding to the logical input signal, each of the primary-side pulses in said primary winding generating in said secondary winding secondary pulses corresponding to the edges of the logical input signal; a selection circuit connected up to said secondary winding, said selection circuit driven by the secondary pulses and separates the secondary pulses according to a respective assignment to an edge of the logical input signal; a latching circuit connected downstream of said selection circuit, said latching circuit comparing separate ones of the secondary pulses with one another and prevents a forwarding of the secondary pulses in an event of separate ones of the secondary pulses occurring simultaneously and/or in an event of the secondary pulses occurring in short-time succession; and a storage element connected to said latching circuit, said storage element being set by the secondary pulses of a first polarity, being reset by the secondary pulses of a second polarity, and generates an output signal.