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Power-amplifier-device-having-a-plurality-of-power-amplifier-units-connected-in-parallel

Tunable resonator for microwave oscillators and filters

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Power amplifier device having a plurality of power amplifier units connected in parallel

Details

Inventors: Kibayashi, Toshimitsu; Toda, Yoshifumi;
Assignee: Fujitsu Limited (Kawasaki, JP)
Primary Examiner: Mottola; Steven
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Westerman, Hattori, McLeland & Naughton

A power amplifier device includes m power amplifier units provided in parallel where m is an integer, a distributor for distributing an input signal to the m power amplifier units, and a combining device for combining m amplified input signals output by the m power amplifier to generate an amplified output signal. The power amplifier device includes a group of switches for gradually disconnecting the m power amplifier units from the distributor and the combining device and for gradually connecting the m power amplifier units to the distributor and the combining device.

DETAILED DESCRIPTION It is a general object of the present invention to provide an improved power amplifier device in which the above-mentioned disadvantages are eliminated.
A more specific object of the present invention is to provide a power amplifier device in which one or more power supply units can be stopped and restarted without resulting in noise and affecting other power supply units.
These objects of the present invention are achieved by a power amplifier device comprising: m power amplifier units provided in parallel where m is an integer; distributing means, operatively coupled to the m power amplifier units, for distributing an input signal to the m power amplifier units; combining means, operatively coupled to the m power amplifier units, for combining m amplified input signals output by the m power amplifier to generate an amplified output signal; and switch means, operatively coupled to the power amplifier units, for gradually disconnecting the m power amplifier units from the distributing means and the combining means and for gradually connecting the m power amplifier units to the distributing means and the combining means.
The above-mentioned objects of the present invention are also achieved by a power amplifier device comprising: m power amplifier units provided in parallel where m is an integer; distributing means, operatively coupled to the m power amplifier units, for distributing an input signal to the m power amplifier units; combining means, operatively coupled to the m power amplifier units, for combining m amplified input signals output by the m power amplifier to generate an amplified output signal; control means, operatively coupled to the m power amplifier units, for respectively controlling the m power amplifier units to reduced gains in accordance with a control signal; and switch means, operatively coupled to the power amplifier units, for respectively disconnecting the m power amplifier units from the distributing means and the combining means after the control means respectively makes the m power amplifier units inactive and for respectively connecting the m power amplifier units to the distributing means and the combining means before the control means respectively stops controlling the m power amplifier units to the reduced gains

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