Patent · US Active

Low-loss, broad band, LC I/Q phase shifter

US8885768B2 · kind B2 · utility

1Cited by

0References

19Claims

0Family size

Assignee

Infineon Technologies AG · DE

Inventors

Shoujun Yang · Linz, AT
Johann Peter Forstner · Ebersberg, DE
Guenter Haider · Linz, AT

Key dates

Filing date	Sep 16, 2011
Grant date	Nov 11, 2014
Priority date	—
Expiry date	Feb 23, 2033

Classification

Technology area (CPC H)Electricity
CPC primaryH04L27/364
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

Some embodiments relate to a phase shifter that includes an I/Q phase shifter and at least one LC balun. Compared to conventional phase shifters, phase shifter has primarily only LC components, thereby limiting losses relative to conventional solutions. In one embodiment, for example, a phase shifter shows a large bandwidth at 77 GHz center frequency (e.g., 1 dB amplitude error bandwidth is approximately 40 GHz; 1° phase error bandwidth is about 16.5 GHz). The inductors included in phase shifter, in contrast to the quarter wave transmission lines used in conventional phase shifters, reduces chip area compared with conventional solutions. In some embodiments, an emitter follower helps to provide a relatively constant output that is largely independent of temperature, input power, VCC, manufacturing variation, and so on.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.