High-power and high-efficiency power amplifier insensitive to source impedance and load impedance

Abstract

The invention discloses a high-power and high-efficiency power amplifier insensitive to source impedance and load impedance. An amplification function of a balance type amplifier is realized through adoption of four ways of three-stack transistor amplification networks, the power gain and power capacity of the balance type amplifier are greatly improved; and moreover, +/-45-degree and +/-135-degree phase-shifting control and input and output impedance matching of four ways of balance signals are realized through utilization of a multi-level T-type filtering phase shift circuit, so on the premise of low insertion loss and high efficiency, the sensitivity of the amplifier for the source impedance and the load impedance is greatly reduced, and the circuit stability and robustness are improved. According to the high-power and high-efficiency power amplifier insensitive to the source impedance and the load impedance realized by the invention, the output power is high, the power gain is high, and the low load impedance sensitivity is high.

Description

technical field [0001] The invention belongs to the technical field of field effect transistor microwave millimeter wave power amplifier and integrated circuit, and specifically relates to the design of a high-power and high-efficiency power amplifier insensitive to source and load impedance. Background technique [0002] With the rapid development of 3G, 4G-LTE and other civilian communication markets, as well as the early layout of 5G communication, microwave and millimeter wave front-end transmitters are also developing in the direction of high power, high integration, and high efficiency in microwave and millimeter wave bands; in addition, due to MIMO With the wide application of technology, the system poses a severe test to the load impedance sensitivity of the terminal power amplifier. Therefore, the market urgently needs low load impedance sensitivity, high power, and high efficiency power amplifier chips for microwave and millimeter wave frequency bands. [0003] How...

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Problems solved by technology

[0004] (1) Low load impedance sensitivity and high efficiency indicators in traditional balanced amplifiers restrict each other: since the output of the power amplifier in the microwave and millimeter wave front-end transmitter needs to be connected to an antenna with poor standing wave characteristics, the antenna is not suitable for microwave The low load impedance sensitivity of millimeter-wave power amplifiers poses a serious challenge; the existing balanced power amplifiers based on the Lange structure to achieve a 90° phase shift often introduce relatively high load impedance sensitivity in the input and output matching networks while improving the load impedance sensitivity. Large in-band insertion loss, thereby reducing the efficiency of the power amplifier; the load impedance sensitivity and output power of the existing balanced power amplifier based on the dual phase shift structure to achieve a phase shift of ±45° still have a large room for improvement

Therefore, low load impedance sensitivity and high efficiency indicators in existing balanced amplifiers are mutually restricted

[0005] (2) It is difficult to design high-power and high-gain indicators of traditional balanced amplifiers in the microwave and millimeter wave bands: driven by the future 5G market, microwave and millimeter wave front-end transmitters urgently need high gain, high power, high efficiency, and low load impedance sensitivity. high-degree power amplifier, but the existing millimeter-wave frequency band application circuit must use a semiconductor process transistor wi

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