A Doherty power amplifier capable of reducing third-order intermodulation and its debugging method

Abstract

The invention discloses a Doherty power amplifier capable of reducing third order intermodulation. The Doherty power amplifier capable of reducing the third order intermodulation comprises a power divider, a phase regulator, a carrier amplifying unit, a peak value amplifying unit, a carrier grid electrode bias voltage regulator, a peak value grid electrode bias voltage regulator, a second lambada / 4 impedance conversion wire and a combiner. The first signal output end of the power divider is connected with the signal input end of the phase regulator, the signal output end of the phase regulator is connected with the signal input end of the carrier amplifying unit, and the signal output end of the carrier amplifying unit is connected with the first signal input end of the combiner. The second signal output end of the power divider is connected with the signal input end of the peak value amplifying unit, and the signal output end of the peak value amplifying unit is connected with the second signal input end of the combiner. The Doherty power amplifier capable of reducing the third order intermodulation enables the third order intermodulation of output signals to be reduced to the minimum value, and at the same time guarantees the efficiency of the Doherty power amplifier. The invention further discloses a modulating method of the Doherty power amplifier to enable the third order intermodulation of output signals to be reduced to the minimum value.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a Doherty power amplifier capable of reducing third-order intermodulation and a debugging method thereof. Background technique [0002] As the concepts of green environmental protection, energy saving and emission reduction are increasingly valued in countries all over the world, communication operators have higher and higher requirements for the reduction of power consumption of wireless communication systems. As the final module in the transmitter, the power amplifier is the part that consumes the most power in the entire wireless communication system. In a communication base station, the proportion of power amplifier system energy consumption can reach 60% or even higher, and the resulting inefficiency will greatly reduce the efficiency of the entire wireless communication system. Specifically, it brings two problems. First, the network coverage of the entire communica...

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Problems solved by technology

[0004] However, the inventors found in their research that if figure 1 As shown, although the traditional Doherty power amplifier can maintain the bias of the carrier amplifier in class AB, the bias of the peak power amplifier in class C and the same impedance transformation relationship, it can improve the efficiency of the power amplifier when the power backs off , however, this also leads to a decrease in the linearity of the power amplifier

Among the common linearization methods, methods such as feedforward method and digital baseband predistortion are more complex or costly to implement; while analog predistortion, such as predistortion based on field effect tubes (corresponding to English: FET), reverse parallel tube For correct pre-distortion, etc., you need to use other non-linear devices, and the debugging is more complicated

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