Wideband dual-band Doherty power amplifier based on phase-delayed dual-band output matching networks

Abstract

The invention discloses a wideband dual-band Doherty power amplifier based on phase-delayed dual-band output matching networks. The wideband dual-band Doherty power amplifier comprises a wideband power divider, a carrier amplifier circuit, a peak amplifier circuit, a phase delay-based carrier dual-band output matching network and a phase delay-based peak dual-band output matching network. An uplink signal and a downlink signal of the wideband power divider are connected with the carrier amplifier circuit and the peak amplifier circuit respectively; the carrier amplifier circuit is formed by connecting a carrier phase compensation line, a carrier input matching network and a carrier transistor in series; the peak amplifier circuit is formed by connecting a peak phase compensation line, a peak input matching network and a peak transistor in series; the carrier amplifier circuit is connected with the phase delay-based carrier dual-band output matching network; and the peak amplifier circuit is connected with the phase delay-based peak dual-band output matching network. Accordingly, the dual-band working capacity of the Doherty power amplifier is achieved by means of the phase cycle repeatability, and the carrier and peak dual-band output matching networks are designed by adopting a stepped impedance structure.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a wideband dual-band Doherty power amplifier based on a phase delay dual-frequency output matching network. Background technique [0002] The improvement of people's requirements for wireless communication speed and quality has promoted the continuous development of modern wireless communication systems, and communication systems need to be compatible with more and more communication standards. On the one hand, in order to increase the transmission rate, communication systems generally use modulation methods with high spectral efficiency such as Orthogonal Frequency Division Multiplexing (OFDM), so that the peak-to-average ratio of the modulated signal is significantly improved. In order to ensure the linearity of the system, the power amplifier needs to work at a power point far away from the saturation state, resulting in a decrease in the efficiency of the power amplifie...

AI Technical Summary

Problems solved by technology

[0004] In summary, the research on the traditional dual-band Doherty power amplifier based on T-shaped or π-shaped structure shows that the existing dual-band Doherty power amplifier technology has limitations on the operating bandwidth in each frequency band, which is difficult to meet the standards of future communication systems Diversification, discontinuous working frequency band and other requirements, and it is also difficult to meet people's urgent needs for high-speed and large-bandwidth

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