Techniques for improving balun loaded-Q

Details Techniques for improving balun loaded-Q Techniques for improving balun loaded-Q

2011-01-04

2011-01-04

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including balanced to unbalanced circuits and vice versa

C330S165000, C330S276000

Reexamination Certificate

active

07863986

ABSTRACT:
Techniques for improving the quality factor (“Q”) of a balun in the presence of loading stages are disclosed. In an exemplary embodiment, the ground node of a balun secondary (single-ended) element is connected to a source node of an amplifier stage via a common ground node. The connection may be made physically short to minimize any parasitic elements. In another exemplary embodiment, the common ground node may be coupled to an off-chip ground voltage via a peaking inductor. The peaking inductor may be implemented on-chip, e.g., as a spiral inductor, or off-chip e.g., using bondwires.

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