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Linear power amplification distortion counteracting method

A linear and signal technology, applied in the improvement of amplifiers to reduce nonlinear distortion, power amplifiers, electrical components, etc., can solve the problems of unstable linear power amplifier circuits, misadjustment, pilot frequency spurs, etc., to avoid misadjustment, White noise stabilization, cost-saving effect

Inactive Publication Date: 2006-06-21
HUAWEI TECH CO LTD
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Problems solved by technology

[0018] Although this method reduces the cost of materials and avoids the possibility of spurs caused by the pilot frequency, the distortion power also changes when the signal power changes. The reason for the amplitude and phase adjustment, adaptive adjustment has the risk of misadjustment leading to loss of control, which directly leads to the instability of the linear power amplifier circuit

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Embodiment Construction

[0035] In order to make the purpose, technical solution and advantages of the present invention clearer, the following examples are given to further describe the present invention in detail.

[0036] The invention proposes a novel control technology of a feedforward linear power amplifier, which controls the amplitude and phase adjustment of the error cancellation loop according to the white noise in the output signal.

[0037] image 3 It is a schematic diagram of the principle of the double-loop feedforward linear power amplifier of the present invention, and the device includes: a first coupler 301, a first attenuator 302, a main power amplifier 303, a second coupler 304, a first delayer 305, a third coupler 306, A second attenuator 307 , an error power amplifier 308 , a second delay 309 , a fourth coupler 3010 , a fifth coupler 3011 , a narrowband receiver 3012 and an automatic controller 3013 . The multi-carrier signal 31 is a signal to be amplified; the signal 32 output...

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Abstract

The invention discloses a distortion counteract method for linear amplifier, which comprises: coupling real-time distortion-counteracted signal on output end of linear amplifier circuit to send to narrow-band receiver to detect white noise signal and change into dc for automatic controller; controlling attenuator in error counteract circuit by said controller to adjust amplitude and phase of signal on its branch to counteract said white noise signal and distortion signal and output treated signal. This invention reduce cost and avoid risk from stray signal without pilot-frequency injection, is not affected by carrier and distortion signal, and ensures the stability of linear amplifier circuit.

Description

technical field [0001] The invention relates to the field of power amplifying circuits, in particular to a method for canceling the distortion of a linear power amplifier. Background technique [0002] In the wireless base station system of mobile communication, the power amplifier module is used to amplify the small signal of the transmitter to a certain power, and then it is fed into the antenna by the feeder to transmit to the space. With the need of business growth, the amount of information transmitted wirelessly is increasing. In order to fully develop and utilize limited spectrum resources, various efficient linear modulation methods have been developed. higher requirements. Due to the inherent nonlinearity of ordinary power amplifiers, spectrum expansion occurs when amplifying linearly modulated signals, and harmful intermodulation products (Intermodulation Distortion, IMD) are generated. [0003] Now there are two methods of canceling the intermodulation products....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10H03F1/32H03F3/20
Inventor 苏永革张孝铁
Owner HUAWEI TECH CO LTD
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