Output power control circuit for a mobile radio apparatus
First Claim
1. An output power control circuit for a mobile radio apparatus having a casing, an automatic power control circuit and an RF signal amplifier, provided in the casing of the mobile radio apparatus and adapted to apply level control signals to the automatic power control circuit for maintaining the power level of the output RF signal of the RF amplifier at one of a plurality of output power levels corresponding to the level control signals, which comprises:
- a receiver means for receiving RF signals transmitted by a master station and for detecting power level setting command signals included in said received RF signals;
a temperature sensing circuit for which detecting the internal temperature of the casing and for providing a power reduction signal upon detecting that said internal temperature has exceeded a predetermined temperature; and
a logic circuit for receiving said power level setting command signal from said receiver means, and for generating a level control signal in digital form for determining an output power level corresponding to said power level setting command signal, and for generating a level control signal for determining an output power level which is lower than that specified by said power level setting command signal upon receiving said power reduction signal from said temperature sensing circuit.
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Accused Products
Abstract
An output power control circuit is provided in a casing of a mobile radio apparatus together with an automatic power control circuit and an RF signal amplifier. The output power control circuit applied level control signals to the automatic power control circuit for maintaining the power level of the output RF signal of the RF amplifier at one of a plurality of output power levels corresponding to the level control signals. The output power control circuit has a receiver, a temperature sensing circuit and a logic circuit. The receiver receives RF signals transmitted by a master station and detects power level setting command signals included in the received RF signal. The temperature sensing circuit detects an internal temperature of the casing and provides a power reduction signal upon detecting that the internal temperature has exceeded a predetermined temperature. The logic circuit receives the power level setting command signal from said receiver, and generates a level control signal for determining an output power level corresponding to the power level setting command signal, and generates a level control signal for determining an output power level which is lower than that specified by the power level setting command signal upon receiving the power reduction signal from the temperature sensing circuit.
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Citations
12 Claims
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1. An output power control circuit for a mobile radio apparatus having a casing, an automatic power control circuit and an RF signal amplifier, provided in the casing of the mobile radio apparatus and adapted to apply level control signals to the automatic power control circuit for maintaining the power level of the output RF signal of the RF amplifier at one of a plurality of output power levels corresponding to the level control signals, which comprises:
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a receiver means for receiving RF signals transmitted by a master station and for detecting power level setting command signals included in said received RF signals; a temperature sensing circuit for which detecting the internal temperature of the casing and for providing a power reduction signal upon detecting that said internal temperature has exceeded a predetermined temperature; and a logic circuit for receiving said power level setting command signal from said receiver means, and for generating a level control signal in digital form for determining an output power level corresponding to said power level setting command signal, and for generating a level control signal for determining an output power level which is lower than that specified by said power level setting command signal upon receiving said power reduction signal from said temperature sensing circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An output power control circuit for controlling an output power level of a mobile radio apparatus having a casing, an automatic power control circuit and an RF signal amplifier, provided in the casing of the mobile radio apparatus and adapted to apply a level control signal to the automatic power control circuit for selecting the output power level in accordance with the level control signal, comprising:
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a receiver means for receiving an RF signal transmitted by a master station and for detecting a power level setting command signal included in the received RF signal; a temperature sensing circuit for detecting the internal temperature of the casing and for providing a power reduction signal upon detecting that the internal temperature of the casing has exceeded a predetermined temperature, and a logic circuit for receiving the power level setting command signal from the receiver means, and for generating a level control signal for determining the output power level; wherein the logic circuit generates a level control signal for selecting an output power level which is lower than that specified by the power level setting command signal when the power reduction signal is received from the temperature sensing circuit and the power level of the RF signal amplifier is at a maximum value. - View Dependent Claims (10, 11, 12)
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Specification