Battery-powered radio communication apparatus capable of prolonging the communicable state thereof
First Claim
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1. A radio communication apparatus comprising:
- power amplifier means for amplifying an input signal;
battery means for supplying power to said power amplifier means;
automatic gain control circuit means for maintaining the output power of said power amplifier means at a first predetermined level in response to the output of said power amplifier means and decreasing the output power of said power amplifier means to a second predetermined level in response to a control signal, said second predetermined level being lower than said first predetermined level; and
comparing means for comparing the output voltage of said battery means with a standard voltage and supplying the resultant to said automatic gain control circuit means as said control signal, when the output voltage of said battery means falls below said standard voltage.
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Abstract
A battery-powered radio communication apparatus is disclosed which comprises a power amplifier and a power detector for detecting the output power of the power amplifier. A supply voltage detector compares a standard voltage with the output voltage of a battery supplying power to the power amplifier. A gain control circuit controls the gain of the power amplifier in response to the output of the power amplifier and to the output of the supply voltage detector so as to prolong, by a certain time, the communicable state of the apparatus prior to battery depletion.
44 Citations
12 Claims
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1. A radio communication apparatus comprising:
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power amplifier means for amplifying an input signal; battery means for supplying power to said power amplifier means; automatic gain control circuit means for maintaining the output power of said power amplifier means at a first predetermined level in response to the output of said power amplifier means and decreasing the output power of said power amplifier means to a second predetermined level in response to a control signal, said second predetermined level being lower than said first predetermined level; and comparing means for comparing the output voltage of said battery means with a standard voltage and supplying the resultant to said automatic gain control circuit means as said control signal, when the output voltage of said battery means falls below said standard voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for prolonging the communicable state of a battery-powered radio communication apparatus, comprising the steps of:
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(a) detecting the output power of a power amplifier included in said apparatus so as to provide a detected signal; (b) providing a control signal when the voltage of the battery which supplies power to said power amplifier falls below a standard voltage; (c) maintaining, in response to said detected signal, the output power of said power amplifier at a first predetermined level; and (d) decreasing, in response to said control signal, the output power of said power amplifier to a second predetermined level, said second predetermined level being lower than said first predetermined level. - View Dependent Claims (9, 10, 11, 12)
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Specification