MOBILE COMMUNICATION DEVICE AND IMPEDANCE MATCHING METHOD THEREOF
First Claim
1. A mobile communication device comprising:
- an antenna;
a power amplifier;
a tunable matching circuit coupled between the antenna and the power amplifier, determining an output impedance encountered by a radio frequency (RF) signal transmitted by the power amplifier to the antenna when the RF signal enters the tunable matching circuit;
a power detection circuit coupled between the antenna and the power amplifier, detecting a forward power of the RF signal entering the antenna and a reflected power of the antenna; and
a controller coupled to the tunable matching circuit and the power detection circuit, tuning the tunable matching circuit according to a frequency range currently used by the mobile communication device, the forward power and the reflected power to steer the output impedance toward a corresponding load-pull impedance that the power amplifier has in the frequency range.
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Accused Products
Abstract
A mobile communication device and an impedance matching method thereof are provided. The mobile communication device includes an antenna, a power amplifier, a tunable matching circuit, a power detection circuit and a controller. The tunable matching circuit determines an output impedance encountered by a radio frequency (RF) signal transmitted by the power amplifier to the antenna when the RF signal enters the tunable matching circuit. The power detection circuit detects a forward power of the RF signal entering the antenna and a reflected power of the antenna. The controller tunes the tunable matching circuit according to a frequency range currently used by the mobile communication device, the forward power and the reflected power to steer the output impedance toward a corresponding load-pull impedance that the power amplifier has in the frequency range.
9 Citations
16 Claims
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1. A mobile communication device comprising:
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an antenna; a power amplifier; a tunable matching circuit coupled between the antenna and the power amplifier, determining an output impedance encountered by a radio frequency (RF) signal transmitted by the power amplifier to the antenna when the RF signal enters the tunable matching circuit; a power detection circuit coupled between the antenna and the power amplifier, detecting a forward power of the RF signal entering the antenna and a reflected power of the antenna; and a controller coupled to the tunable matching circuit and the power detection circuit, tuning the tunable matching circuit according to a frequency range currently used by the mobile communication device, the forward power and the reflected power to steer the output impedance toward a corresponding load-pull impedance that the power amplifier has in the frequency range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An impedance matching method adapted for a mobile communication device, the mobile communication device comprising an antenna, a tunable matching circuit and a power amplifier, the tunable matching circuit being coupled between the antenna and the power amplifier and determining an output impedance encountered by a radio frequency (RF) signal transmitted by the power amplifier to the antenna when the RF signal enters the tunable matching circuit, the impedance matching method comprising:
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detecting a forward power of the RF signal entering the antenna and a reflected power of the antenna; and tuning the tunable matching circuit according to a frequency range currently used by the mobile communication device, the forward power and the reflected power to steer the output impedance toward a corresponding load-pull impedance that the power amplifier has in the frequency range. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification