Integrated transformer structure with primary winding in substra

Details Integrated transformer structure with primary winding in substra Integrated transformer structure with primary winding in substra

1986-05-08

1988-11-15

Edlow, Martin H.

Inductor devices

Interlinked coils or windings

Coil surrounding linear conductor

357 54, 357 73, 336200, 336220, 336232, H01L 2934, H01L 2702, H01L 2330, H01F 500

Patent

active

047853450

ABSTRACT:
An integrated transformer structure is disclosed. In one embodiment, the primary transformer winding is formed using dielectrically isolated (DI) technology so as to isolate high voltages applied to the transformer primary from other components in the substrate. Alternatively, conventional junction isolated technology may be used, where physical separation between the integrated transformer and other components may be provided. In accordance with the present invention, the primary winding comprises a planar spiral formed with a low-resistivity material and incorporated with the substrate. An insulating layer is then formed over the primary winding. A planar spiral configuration is also used to form the secondary winding, where the secondary may be formed of a deposited metal and is formed on top of the insulating layer so as to be directly above the primary winding. The result is an effective air-core transformer structure capable of isolating thousands of volts.

REFERENCES:
patent: 3848210 (1974-11-01), Felkner
patent: 4103267 (1978-07-01), Olschewski
patent: 4183074 (1980-01-01), Wallace
patent: 4249229 (1981-02-01), Hester
patent: 4482874 (1984-11-01), Rubertus et al.
patent: 4494100 (1985-01-01), Stengel et al.
patent: 4547961 (1985-10-01), Bokil et al.
patent: 4555291 (1985-11-01), Tait et al.

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