Wireless communication frequency signal amplification...

Details Wireless communication frequency signal amplification... Wireless communication frequency signal amplification...

2005-02-08

2005-02-08

Le, Dinh T. (Department: 2816)

Amplifiers

Combined with automatic amplifier disabling switch means

C330S129000

Reexamination Certificate

active

06853243

ABSTRACT:
To provide a high frequency amplifying apparatus for reducing a phase change caused in switching to a different output level, a variable phase shifter is provided at at least one location of respective paths rearward from a branching circuit for switching a path on a high output side having an amplifier using a first semiconductor device at an output stage and a path on a low output side having an amplifier using a second semiconductor device with a smaller output than the first semiconductor device on an output stage in accordance with a desired output level. After branching and a phase length of the variable phase shifter is set to a pre-determined value such that passing phase lengths of the respective paths become substantially the same by passing either of the paths.

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patent: 2000-183664 (1998-12-01), None

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