Isolation and signal filter transformer

Details Isolation and signal filter transformer Isolation and signal filter transformer

1996-04-30

1998-09-01

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333184, 333185, 336200, 336232, H03H 709

Patent

active

058016023

ABSTRACT:
One embodiment of the invention includes a transformer that is at least partially formed on a substrate. The transformer is for electrical isolation and signal filtering. The transformer includes the following elements. A portion of the substrate has two holes through the substrate. A ferrite core is formed in a loop through the two holes. A primary winding is made of a first metal trace. The first metal trace is formed in a spiral around one hole. The first metal trace has at least two primary terminals acting as an input to the transformer. The transformer also includes a secondary winding. The secondary winding is made of a second metal trace. The second metal trace is formed in a spiral around the other hole. The second metal trace has at least two secondary terminals acting as an output from the transformer. The parasitic capacitance of the first metal trace and the magnetizing inductance of the primary winding cause signals received at the primary terminals to be filtered as the signals are passed through the transformer to the secondary terminals.

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