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EP0509733A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Radio-frequency power amplifier device

Assignee: Mitsubishi Electric Corp
•
Filing: 1992-04-13
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Granted: —
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Expires: 2012-04-13
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Abstract

Abstract A radio-frequency power amplifier device, has a radio-frequency power amplifier (2) for an input RF signal. Part of the output signal (4) of the amplifier (2) is extracted, and the extracted voltage is compared with a reference voltage (18a), to apply a negative feedback to the gain control terminal (3) of the power amplifier (2), thereby stabilizing the output power. The output power value is switched in accordance with a power level control signal (10a). A variable attenuator (11) or a variable-coupling-coefficient coupling means provided in front of the detector circuit (6) switches the attenuation or the coupling coefficient depending on the power level, such that the magnitude of the input to the detector circuit (6) is maintained at a constant level. The detector circuit (6) therefore operates at the same operating point regardless of the switching of the power level, and the dynamic range required of the detector circuit (6) may be narrow. The temperature variation of the output power at the time of low power output is small.

Inventors

  • 👤 Yasushi c/o Mitsubishi Denki K.K. Iwane

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 18:53
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G3/3042

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 168 words
A radio-frequency power amplifier device for producing an output whose magnitude is switched in accordance with a power level switch control signal, comprising: a radio-frequency power amplifier (2) receiving an input and providing a power-amplified output (4); an extracting means (5) for extracting part of the output power at the output of the radio-frequency power amplifier, and outputting a signal having a magnitude indicative of the magnitude of the output of the power amplifier and varied in accordance with the power level switch control signal; a high-frequency detecting means (6) for detecting the output of the extracting means; a comparing and smoothing means (9) for comparing the detected voltage of the high-frequency detecting means with a predetermined reference voltage, and smoothing the difference; a feedback gain control means (12) for controlling the magnitude of the output of the comparing and smoothing means; and an output power adjusting means for controlling the output power of the power amplifier in accordance with the output of the feedback gain control means.
Claim 2
Dependent Claim 66 words
The device of claim 1, wherein said extracting means comprises: a coupling means for extracting part of the output power of the radio-frequency power amplifier and outputting a signal corresponding to the magnitude of the output of the power amplifier; and a variable attenuator receiving the output signal from the coupling means, and having its attenuation varied in accordance with the power level switch control signal.
Claim 3
Dependent Claim 28 words
The device of claim 1, wherein said extracting means comprises a coupling-coefficient-variable coupling means having a coupling coefficient controlled in accordance with the power level switch control signal.
Claim 4
Dependent Claim 38 words
The device of claim 1, wherein said extracting means controls the magnitude of its output signal so as to be at a constant level regardless of the switching of the power level of the output of the device.
Claim 5
Dependent Claim 23 words
The device of claim 1, further comprising a means for varying the reference voltage in accordance with the power level switch control signal.
Claim 6
Dependent Claim 35 words
The device of claim 5, wherein said extracting means controls the magnitude of its output signal such that its variation with the switching of the power level of the output of the device is reduced.
Claim 7
Dependent Claim 24 words
A radio-frequency power amplifier device substantially as herein described with reference to any one of Figures 1, 2 or 3 of the accompanying drawings.

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