Baluns for multiple band operation

Wave transmission lines and networks – Coupling networks – Balanced to unbalanced circuits

Reexamination Certificate

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Details

C333S026000

Reexamination Certificate

active

10978596

ABSTRACT:
A small size, low cost balun is formed on a substrate, such as gallium arsenide, as an integrated passive device. Multiple baluns are formed on a same substrate, allowing multi-band operation. For example, symmetrical transformers are provided for two different bands of operation, such as for a quad-band GSM application. Each of the two different baluns is used for two different frequency bands of operation of the quad-band device. A ground ring allows two Hi-Q baluns to be formed on the same integrated circuit side-by-side with minimum spacing and minimum impact on phase and amplitude performance over the frequency bands of operation. By using multiple integrated circuit baluns on a same substrate or chip, the size and cost of baluns for multi-band operation may be reduced.

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Chip Multiolayer Hybrid Baluns Spec Sheet; dated Feb. 28, 2003.

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