EP0472330A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Transmission output control circuit
Assignee: Panasonic Holdings Corp
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Filing: 1991-08-08
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Granted: —
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Expires: 2011-08-08
Abstract
Abstract In a radio transmitter, a part of an output of a transmission output amplifying circuit (2) is supplied to a variable attenuating circuit (6) and an output of the variable attenuating circuit (6) is supplied to a detecting circuit (4). An output of the detecting circuit (4) and a reference voltage (8) are compared and a control voltage is given to the transmission power amplifying circuit (2) in accordance with the result of the comparison, thereby controlling the transmission output. By controlling the attenuation amount of the variable attenuating circuit (6), the transmission output can be controlled over a wide dynamic range with a high reproducing fidelity.
Inventors
- 👤 Yukichi Aihara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 12:04
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G3/3042; H03G3/3047
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
95 words
A transmission output control circuit comprising: a transmission power amplifying circuit (2) for amplifying a transmission power; a directional coupler (3) for separating a part of an output of the transmission power amplifying circuit (2); a variable attenuator (6) for attenuating a separated output; a detecting circuit (4) for detecting an output attenuated by the variable attenuator (6); and control means (5) for controlling an amplification factor of the transmission power amplifying circuit (2) in accordance with a result of a comparison between an output of the detecting circuit (4) and a reference value (8).
Claim 2
Dependent Claim
85 words
A transmission output control circuit comprising: a transmission power amplifying circuit (2) for amplifying a transmission power; a variable attenuator (6) for attenuating a part of an output of the transmission power amplifying circuit (2); a detecting circuit (4) for detecting an output of the variable attenuator (6); and control means (5) for controlling an amplification factor of the transmission power amplifying circuit (2) in accordance with a result of a comparison between an output of the detecting circuit (4) and a reference value (8).
Claim 3
Dependent Claim
32 words
A transmission output control circuit according to Claim 1 or 2, having a variable attenuating circuit (6) for enabling an attenuation amount to be changed on a 2 dB step unit basis.
Claim 4
Dependent Claim
95 words
A transmission output control circuit comprising: a transmission power amplifying circuit (2) for amplifying a transmission power; a directional coupler (3) for separating a part of an output of the transmission power amplifying circuit (2); a non-linear amplifier (7) for amplifying a separated output; a detecting circuit (4) for detecting an output amplified by the non-linear amplifier (7); and control means (5) for controlling an amplification factor of the transmission power amplifying circuit (2) in accordance with a result of a comparison between an output of the detecting circuit (4) and a reference value (8).
Claim 5
Dependent Claim
85 words
A transmission output control circuit comprising: a transmission power amplifying circuit (2) for amplifying a transmission power; a non-linear amplifier (7) for amplifying a part of an output of the transmission power amplifying circuit (2); a detecting circuit (4) for detecting an output of the non-linear amplifier (7); and control means (5) for controlling an amplification factor of the transmission power amplifying circuit (2) in accordance with a result of a comparison between an output of the detecting circuit (4) and a reference value (8).
Claim 6
Dependent Claim
29 words
A transmission output control circuit according to Claim 4 or 5, wherein the non-linear amplifier (7) has a characteristic such that a gain decreases with an increase in input.
Claim 7
Dependent Claim
21 words
A transmission output control circuit according to Claim 4 or 5, wherein the non-linear amplifier (7) has a logarithm converting characteristic.
Claim 8
Dependent Claim
105 words
A transmission output control circuit comprising: a transmission power amplifying circuit (2) for amplifying a transmission power; a directional coupler (3) for separating a part of an output of the transmission power amplifying circuit (2); a serial circuit of a variable attenuating circuit (6) and a non-linear amplifier (7) each of which receives a separated output; a detecting circuit (4) which receives an output of the serial circuit; and control means (5) for controlling an amplification factor of the transmission power amplifying circuit (2) in accordance with a result of a comparison between an output of the detecting circuit (4) and a reference value (8).
Claim 9
Dependent Claim
98 words
A transmission output control circuit comprising: a transmission power amplifying circuit (2) for amplifying a transmission power; a variable attenuator (6) for attenuating a part of an output of the transmission power amplifying circuit (2); a non-linear amplifier (7) which receives an output of the variable attenuator (6); a detecting circuit (4) which receives an output of the non-linear amplifier (7); and control means (5) for controlling an amplification factor of the transmission power amplifying circuit (2) in accordance with a result of a comparison between an output of the detecting circuit (4) and a reference value (8).
Claim 10
Dependent Claim
95 words
A transmission output control circuit comprising: a transmission power amplifying circuit (2) for amplifying a transmission power; a serial circuit of a variable attenuator (6) and a non-linear amplifier (7) to which a part of an output of the transmission power amplifying circuit (2) is supplied; a detecting circuit (4) which receives an output of the serial circuit; and control means (5) for controlling an amplification factor of the transmission power amplifying circuit (2) in accordance with a result of a comparison between an output of the detecting circuit (4) and a reference value (8).
Claim 11
Dependent Claim
35 words
A transmission output control circuit according to any one of Claims 8 to 10, having a variable attenuating circuit (6) for enabling an attenuation amount to be changed on a 2 dB step unit basis.
Claim 12
Dependent Claim
32 words
A transmission output control circuit according to any one of Claims 8 to 10, wherein the non-linear amplifier (7) has a characteristic such that a gain decreases with an increase in input.
Claim 13
Dependent Claim
24 words
A transmission output control circuit according to any one of Claims 8 to 10, wherein the non-linear amplifier (7) has a logarithm converting characteristic.
References Cited (Backward Citations)
No citation records indexed.
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