Output matching circuit of radio frequency (RF) power amplifier

Abstract

The invention discloses an output matching circuit of an RF power amplifier. The output matching circuit is used in the output end of the RF power amplifier, and at least comprises a first capacitor and a second inductor, wherein one end of the first capacitor is connected with a collector of an amplifying tube of the RF power amplifier, and the other end is grounded; and one end of the second inductor is connected with the collector of the amplifying tube, and the other end is connected with the power voltage. By adopting a low-pass structure, the output matching circuit not only can improve gains, suppress harmonics and improve standing-wave ratio, but also has low power loss, thereby improving efficiency and output capacity of the power amplifier.

Description

technical field [0001] The invention relates to an output matching circuit, in particular to an output matching circuit of a radio frequency power amplifier. Background technique [0002] The RF power amplifier is an indispensable circuit module in the wireless communication system. It is mainly responsible for amplifying the modulated RF signal to a certain power value, and then transmitting it through the antenna. For RF power amplifiers used in transmitters of portable handheld devices, small size, high efficiency and low cost are required, so the RF power amplifiers should have as high an integration level as possible. In the existing RF power amplifier design, considering the requirements on the RF output power and power gain, two-stage or multi-stage amplifiers are usually used to realize the RF power amplifier. Since it is a two-stage or multi-stage RF power amplifier, an inter-stage matching circuit is required to match the output of the first stage (pre-stage) and ...

AI Technical Summary

Problems solved by technology

[0006] For a power amplifier, the output impedance controls the power, gain and noise transmitted to the output terminal, so the design of the output matching circuit of the power amplifier is the key to the optimal circuit performance, but the power loss of the output matching circuit is easy in the design process. Neglected problems, most of the power amplifier output matching circuits in the prior art have not considered the problem of power loss. These power losses are reflected in the capacitors, inductors and other energy-consuming components of the matching network, which reduces the efficiency and output of the power amplifier. ability

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