Multi-frequency multi-mode power amplifier and operating method thereof
A power amplifier circuit, multi-mode technology, applied in the direction of improving amplifiers to improve efficiency, gated amplifiers, amplifier input/output impedance improvements, etc., can solve the problem of not having adjustable average and high output power points, increasing design complexity Degree and other issues
Active Publication Date: 2011-08-10
IND TECH RES INST
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Problems solved by technology
However, most of the common Doherty power amplifiers in the market are single-frequency single-mode operation, and its future is gradually facing challenges
Although there are a few patents such as U.S. Patent US6137355 that propose single-frequency dual-mode operation, the patent mentions that the effective area and operation category of the active element can be adjusted by bias voltage (such as A, AB and B in transistor operation, etc.), The power amplifier is switched between high linearity and high efficiency modes. However, it does not have the external circuit required by the Doherty power amplifier, so it does not have the characteristics of adjustable average and high output power points, and it needs More groups of bias control circuits, thus increasing design complexity, while in terms of frequency, it is limited to single-frequency operation
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[0056] The multi-frequency multi-mode power amplification circuit of this embodiment at least includes: an input signal processing unit, a carrier power amplifier, a peak power amplifier and an output signal processing unit. For example, the above two power amplifiers constitute a Doherty power amplifier. The input signal processing unit is used for receiving the radio frequency signal, and outputting the first signal and the second signal. The input signal processing unit mainly performs signal power distribution and input impedance matching with the back-end amplifier. The input terminal of the carrier power amplifier is coupled to the input signal processing unit, and receives the first signal to generate the first amplified signal, and further includes a first transistor size adjustment unit, which adjusts the equivalent transistor size according to the mode indication signal. The input terminal of the peak power amplifier is coupled to the input signal processing unit, a...
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The invention relates to a multi-frequency multi-mode power amplifier, which comprises a carrier wave power amplifier and a peak value power amplifier. An input end of the carrier wave power amplifier receives a first signal after impedance matching to generate a first amplified signal, wherein the carrier wave power amplifier also comprises a first transistor dimension adjusting unit which carries out equivalent transistor dimension adjusting according to a mode indication signal The input end of the peak value power amplifier receives a second signal after the impedance matching to generatea second amplified signal, wherein the peak value power amplifier also comprises a second transistor dimension adjusting unit which carries out the equivalent transistor dimension adjusting accordingto the mode indication signal.
Description
technical field [0001] The present invention relates to a power amplifier circuit and its operating method, and in particular to a multi-frequency and multi-mode power amplifier circuit and its operating method. Background technique [0002] With people's desire for the transmission capacity of wireless communication systems, high-order digital modulation methods have been widely adopted, and their inherent modulation characteristics require power amplifiers to have a relatively large peak-to-average output power ratio. In terms of general systems and environments, traditional power amplifiers operate in the low-efficiency average output power region most of the time, and the larger high-to-average output power ratio means that the power amplifier will face lower operating efficiency . This means that the power amplifier will become a low-efficiency component as the digital modulation method becomes higher-order. [0003] Unfortunately, the high power consumption of the po...
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IPC IPC(8): H03F1/02H03F1/56H03F3/72H03H7/38
Inventor 王士鸣陈正中许佑诚赖柊棋
Owner IND TECH RES INST