H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/56, 325/70
H04B 1/04 (2006.01) H03G 3/20 (2006.01) H04B 7/005 (2006.01)
Patent
CA 1164054
ABSTRACT A radio transmitter for use in a mobile communication system is disclosed. To maintain the radio signal intensity at the base station within prescribed limits it is necessary to control the transmitter power output to compensate for varying distances between the mobile unit and the base station. Typically, the conventional control circuit comprises a power amplifier, a directional coupler coupled to the power amplifier, a detector detecting the forward power of the coupler, a generator generating a difference voltage between the output voltage of the detector and a reference voltage and a power regulator to regulate the output power of the power amplifier in response to the difference voltage. The transmitter power is changed by varying the reference voltage in response to control signals. A disadvantage of the conventional system is that it has a narrow range in which the output power is controllable. According to the invention disclosed, additional circuitry is provided for varying electrically the coupling coefficient of the directional coupler, thereby extending the con- trollable range of the transmitter output power.
368156
Nippon Electric Co. Ltd.
Smart & Biggar
LandOfFree
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