Power control circuit for use with transmitter

Details Power control circuit for use with transmitter Power control circuit for use with transmitter

H - Electricity

04

B

H04B 1/04 (2006.01) H03G 3/30 (2006.01)

Patent

CA 2154968

A power control circuit has a saturation preventing control loop constructed of a variable gain amplifier, an RF power amplifier, a directional coupler, a detecting circuit, a comparator, a switch, an adder, and so forth. When the signal level of an output signal of the comparator is "L", the switch is turned on. When the signal level of the output signal of the comparator is "H", the switch is turned off. A system power control loop is constructed of a system power control terminal, an adder, a variable gain amplifier, and so forth. Since the saturation preventing control loop is provided with the switch, only when the signal level of the amplified signal is larger than a predetermined reference value, the saturation preventing control loop operates. Otherwise, the system power control loop can properly operate corresponding to the system power control signal supplied from the system power control terminal.

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