High-efficiency power amplifier for Internet of Vehicles communication

Abstract

The invention discloses a high-efficient power amplifier for Internet of Vehicles communication. The high-efficient power amplifier comprises an input single-ended to differential power distribution phase shift network, a first self-biased three-stacked amplification network, a second self-biased three-stacked amplification network, a third self-biased three-stacked amplification network, a fourthself-biased three-stacked amplification network and an output differential to single-ended power synthesis phase shift network. According to the invention, the core architecture adopts the characteristics of high power and high gain of a self-biased three-stack amplification network formed by heterojunction bipolar transistors in a radio frequency microwave band; and meanwhile, the good parasiticparameter inhibition of the differential amplifier in the microwave frequency band is combined with the good power back-off efficiency characteristic of the Doherty amplification structure, so that the whole power amplifier obtains good high gain, high back-off efficiency and high power output capability.

Description

technical field [0001] The invention relates to the field of heterojunction bipolar transistor radio frequency power amplifiers and integrated circuits, in particular to a high-efficiency power amplifier chip circuit oriented to vehicle networking communication (C-V2X) application transmitting modules based on cellular technology . Background technique [0002] With the rapid development of 5G wireless communication systems and radio frequency circuits, the Internet of Vehicles communication based on cellular technology in the 5.9 GHz frequency band also has unprecedented application space, and its radio frequency front-end transceiver circuits are also developing in the direction of high performance, high integration, and low power consumption. Therefore, the car networking communication market urgently needs the radio frequency power amplifier of the transmitter to have high linear output power and efficiency, reduce heat dissipation, and improve circuit stability, and the...

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Problems solved by technology

[0003] (1) The power amplifier efficiency is limited under high back-off power, and the power consumption is high: when the traditional AB class power amplifier realizes peak-to-average ratio signal amplification, the efficiency is low under high back-off power, so the power consumption is large

[0004] (2) The power gain is limited, and the insertion loss is greatly deteriorated: the 5.9 GHz frequency band is often implemented by a semiconductor process with a lower cost and a lower characteristic frequency, which limits the single-tube gain of the power amplifier, and with the increase of the frequency band , the parasitic parameters of the transistor become larger, and the parasitic loss of the circuit deteriorates greatly, which affects the performance of the circuit;

[0005] (3) Limitation of using lumped parameter circuit design: When designing traditional lumped parameter RLC matching circuits in the 5.9 GHz frequency band, it is still necessary to use devices with large chip areas such as inductors and capacitors, and due to the increased substrate loss, the inductance Q The value is low, so it brings limitations to the circuit design

[0007] (1) When the traditional Doherty single-ended power amplifier realizes the 5.9 GHz frequency band circuit design, due to the influence of parasitic parameters, the fallback efficiency index is often poor;

[0008] (2) When the traditional Doherty single-ended power amplifier realizes the 5.9 GHz frequency band circuit design, it often uses the AB class drive amplifier to drive the Doherty amplifier. The good load-pull effect under the high back-off of the main circuit and the auxiliary circuit of the amplifier leads to a decrease in the back-off efficiency and a deterioration of the linearity index

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