Efficient Doherty power amplifier

Abstract

The invention discloses an efficient Doherty power amplifier, which comprises a driving power amplifier and a final power amplifier; the driving power amplifier has a balanced amplifying structure composed of a power dividing bridge 1, a driving power amplifier 2, a nonlinear network 1, a combiner 1 and a load; and the final power amplifier has a Doherty amplifying structure composed of a power dividing bridge 2, a nonlinear network 2, a carrier power amplifier, a peak power amplifier and a combiner 2. The driving power amplifier 1 and the driving amplifier 2 both work in type B bias, so the linearity and effectiveness of driving power amplifier can be improved. The carrier power amplifier works in type B bias; and the peak power amplifier works in type C bias and utilizes asymmetrical Doherty structure, so the efficiency of final power amplifier in reduction of 8dB is greatly improved. The efficient Doherty power amplifier has the advantages that the driving power amplifier and the final power amplifier are both efficient in working states, which can efficiently amplify the peak-to-average ratio. Meanwhile, uniformity of batch production of such efficient Doherty power amplifier can be greatly improved by adding the nonlinear matching network in the separating end of the power distributing bridge in the Doherty structure.

Description

technical field [0001] The invention relates to the field of mobile communication, and mainly relates to a high-efficiency Doherty power amplifier. Background technique [0002] At present, energy saving and consumption reduction is a global hotspot. Mobile communication products are also required to be green products. The efficiency of communication products directly affects the cost, performance, volume and other indicators of communication products, which is also the core competitiveness of products. The energy consumption of RF power amplifiers is more than 60% of the total energy consumption of base stations and repeaters. Therefore, improving the efficiency of RF power amplifiers is a hot and difficult point in this field. Doherty amplifier technology is currently the most effective technology to improve efficiency. The traditional Doherty amplifier is a carrier power amplifier and a peak power amplifier by two independent amplifier tubes packaged in the same type....

AI Technical Summary

Problems solved by technology

Due to the discreteness of the device, the input standing waves of the carrier power amplifier and the peak power amplifier are different, resulting in a mismatch in amplitude and phase when the output power of the two branches is combined, which will seriously reduce the linearity and efficiency indicators of the entire power amplifier.

Consistency when affecting mass production

Images