Orthogonal synthesis power amplifier of transformer
A technology of power amplifier and quadrature synthesis, which is applied in amplifiers, DC-coupled DC amplifiers, differential amplifiers, etc., can solve the problems of decreased overall system efficiency, polar coordinate architecture is not suitable for broadband applications, and increases the complexity of transmitters, etc., to achieve Effects of Simplified Circuit Complexity, Low Phase Distortion, and High Linearity
Active Publication Date: 2017-06-20
FUDAN UNIV
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However, the polar coordinate architecture is not suitable for broadband applications, because the decomposition of the signal will broaden the spectrum by more than 5 times, the amplitude and phase modulation branch must provide wider signal bandwidth, and require a complicated signal calibration process, which will not only increase the transmitter's complexity, and the overall efficiency of the system drops significantly
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[0026] like figure 1 As shown, the first orthogonal synthesis method consists of an active part and a passive part. Among them, the active part is composed of four branches (110, 111, 112, 113) in differential orthogonality, and the passive network part is composed of two transformers (210, 211) and matching circuit components (310, 311), and 410 is output load. Wherein, the I path includes a pair of differential branches (110, 111), and the Q path includes a pair of differential branches (112, 113). The primary coil of the transformer ( 210 , 211 ) realizes the synthesis of differential signals, and the secondary coil completes the synthesis of I / Q quadrature signals. The turns ratio of the primary coil and the secondary coil depends on the optimal impedance of the power amplifier.
[0027] like figure 2 As shown, the second orthogonal synthesis method consists of an active part and a passive part. Among them, the active part is composed of four branches (110, 112, 111,...
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The invention belongs to the technical field of wireless communication and particularly relates to an orthogonal synthesis power amplifier of a transformer. The power amplifier provided by the invention comprises a transistor-grade active part and a passive network part synthesized based on the transformer, wherein the active part is realized by adopting a linear or non-linear, pure-simulation or full-digital type power amplifier; and the passive network part realizes synthesis of an orthogonal signal, impedance conversion and conversion from difference to a single end by adopting the transformer. Compared with a polar coordinate power amplifier which is frequently adopted at present, modules including a signal decomposition module, an amplitude modulation module, a phase modulation module and the like are not used, and for broadband application, a passband processing capability, which is much higher than a signal bandwidth, does not need to be realized, so that relatively high transmission efficiency can be realized under a condition that the complexity of a circuit is simplified, and the orthogonal synthesis power amplifier is especially suitable for broadband applications. Moreover, the power amplifier provided by the invention is easily expanded into structures composed of N same power units, so that the requirements on high data rate and high output power of different broadband applications are met.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a power amplifier circuit. Background technique [0002] The rapid development of wireless communication technology has greatly changed people's lives. At present, smartphones and tablets supporting 3G / 4G (3GPP / LTE) mobile communication, wireless local area network (WLAN), wireless metropolitan area network (WiMAX) and other applications have become The standard configuration of people's daily life. In order to meet the needs of a large number of users for high-definition image and video transmission, these communication standards usually use Orthogonal Frequency Division Multiplexing (OFDM) modulation to improve the transmission data rate and spectrum utilization. However, the OFDM modulation method will introduce the peak-to-average ratio (PAPR) problem. In order to ensure the linearity under the peak power, the power amplifier usually works in the s...
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Login to View More IPC IPC(8): H03F1/56H03F1/32H03F3/195H03F3/213H03F3/45
CPCH03F1/32H03F1/3211H03F1/56H03F3/195H03F3/213H03F3/45928H03F2200/451
Inventor 徐鸿涛殷韵
Owner FUDAN UNIV