Title:
HIGH FREQUENCY FRONT END CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2015/125637
Kind Code:
A1
Abstract:
A high frequency front end circuit (10) comprises a duplexer (20) and a phase adjustment circuit (30). A balanced line is provided between an Rx filter (22) of the duplexer (20) and a low noise amplifier (LNA). The phase adjustment circuit (30) is connected between the Rx filter (22) and the low noise amplifier (LNA). The phase adjustment circuit performs a phase adjustment such that the phase difference between first and second balanced signals outputted from the Rx filter (22) is within a range of about minus 90 degrees to about plus 90 degrees for a particular frequency different from the fundamental frequency band of a received signal. At this moment, the phase adjustment circuit (30) has been phase-adjusted such that the phase difference between a first balanced signal outputted from a first balanced terminal of the Rx filter (22) and a second balanced signal outputted from a second balanced terminal of the Rx filter (22) for the fundamental frequency band of the received signal is about 180 degrees.
Inventors:
UEJIMA TAKANORI (JP)
KITAJIMA HIROMICHI (JP)
ARIUMI SANEAKI (JP)
HAYAFUJI HISAO (JP)
TSUJIGUCHI TATSUYA (JP)
KITAJIMA HIROMICHI (JP)
ARIUMI SANEAKI (JP)
HAYAFUJI HISAO (JP)
TSUJIGUCHI TATSUYA (JP)
Application Number:
PCT/JP2015/053465
Publication Date:
August 27, 2015
Filing Date:
February 09, 2015
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H04B1/52; H03H7/18; H03H7/46; H03H9/70; H03H9/72
Foreign References:
| JP2004215244A | 2004-07-29 |
Attorney, Agent or Firm:
Kaede Patent Attorneys' Office (JP)
Patent business corporation Kaede Patent Attorneys' Office (JP)
Patent business corporation Kaede Patent Attorneys' Office (JP)
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