METHOD AND APPARATUS FOR DERIVING POWER FROM A CLOCK SIGNAL COUPLED THROUGH A TRANSFORMER

摘要

A transformer driver circuit connected to the primary or "system" side of a transformer has a system clock connected to an input thereof, the system clock having a frequency selected to constitute the desired clock frequency of a CODEC circuit located on the secondary or "line" side of the transformer. A signal line is connected to a point on the secondary of the transformer so as to tap the system clock frequency, whereby both the system clock and the source voltage for the CODEC are derived from the transformer's secondary.