RF power amplifying device and wireless communication terminal device
AssigneeRenesas Electronics Corporation
InventorsAkira Kuriyama, Hidetoshi Matsumoto
Life of this patent
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Abstract
A RF power amplifying device is constituted by a system of a balanced amplifier including first phase shifters, a first RF power amplifier, a second RF power amplifier, second phase shifters, and a power combiner. Transmitting power Pout is detected by a first power level detector connected to an output of the first RF power amplifier, a second power level detector connected to an output of the second RF power amplifier, and an adder. A level control signal from a level control circuit controls transmitting power in response to a transmitting signal with wanted power level and a detected signal of the adder.
Claims15
An RF power amplifying device constituted as a balanced amplifier comprising:
- a first RF power amplifier;
- a second RF power amplifier;
- first phase shifters arranged on input sides of the first RF power amplifier and the second RF power amplifier;
- second phase shifters arranged on output sides of the first RF power amplifier and the second RF power amplifier;
- a power divider that responds to an RF signal input supplied to an RF signal input terminal and supplies first and second outputs thereof to respective inputs of the first phase shifters,
- a power combiner that combines an output of the first RF power amplifier and an output of the second RF power amplifier transmitted through the second phase shifters;
- and
- an adder,
- wherein the first and second RF power amplifiers respectively amplify the first and second outputs of the power divider transmitted through the first shifters,
- wherein the RF power amplifying device further includes:
- a first power level detector, an input of which is supplied with the output of the first RF power amplifier;
- and
- a second power level detector, an input of which is supplied with the output of the second RF power amplifier, and
- wherein an output of the first power level detector and an output of the second power level detector are supplied to the adder, and
- wherein a level of RF transmitting power obtained at an output of the power combiner is controlled by a detected signal from an output of the adder.
A wireless communication terminal device having a balanced amplifier system, the balanced amplifier system comprising:
- a first RF power amplifier;
- a second RF power amplifier;
- first phase shifters arranged on input sides of the first RF power amplifier and the second RF power amplifier;
- second phase shifters arranged on output sides of the first RF power amplifier and the second RF power amplifier;
- a power divider that responds to an RF signal input supplied to an RF signal input terminal and supplies first and second outputs thereof to respective inputs of the first phase shifters, and
- a power combiner that combines an output of the first RF power amplifier and an output of the second RF power amplifier transmitted through the second phase shifter,
- wherein the first and second RF power amplifiers respectively amplify the first and second outputs of the power divider transmitted through the first shifters, wherein
- the balanced amplifier system further including:
- a first power level detector, to an input of which is supplied with the output of the first RF power amplifier;
- a second power level detector, an input of which is supplied with the output of the second RF power amplifier;
- and
- an adder to which an output of the first power level detector and an output of the second power level detector are supplied, and
- a level control circuit that generates a level control signal for controlling a level of RF transmitting power obtained at an output of the power combiner in response to a desired transmitting signal power level and a detected signal from an output of the adder,
- wherein when a level of the detected signal rises to be higher than the desired transmitting signal power level, the level of the RF transmitting power is lowered according to the level control signal generated from the level control circuit, and
- the balanced amplifier further includes a voltage source circuit that supplies a drive voltage to at least the first RF power amplifier and the second RF power amplifier based on an operating voltage from a battery.
Dependencies are inferred from the claim text.