Electronic system, radio frequency power amplifier and method for dynamic adjustment of bias point

Abstract

The invention discloses an electronic system, a radio frequency power amplifier and a method for dynamically adjusting a bias point thereof. The RF power amplifier includes a bias voltage circuit, an output stage circuit and a dynamic bias voltage control circuit. The bias circuit receives the first system voltage, and the bias circuit provides an operating voltage according to the first system voltage. The output stage circuit receives an operating voltage to operate at an operating bias point. The dynamic bias control circuit detects the radio frequency input signal and outputs a compensation voltage to the bias circuit according to the change of the radio frequency input signal, wherein the dynamic bias control circuit is an open-loop configuration. When the input power of the radio frequency input signal increases and the operating bias point shifts and the operating voltage drops, the bias circuit increases the operating voltage according to the received compensation voltage to recover or increase the operating bias point.

Description

technical field [0001] The present invention relates to a radio frequency power amplifier, and in particular to a radio frequency power amplifier with dynamic adjustment of bias point. Background technique [0002] With the development of the Internet, people are accustomed to receiving large amounts of information quickly, especially after the advancement of wireless communication technology in recent years, personal mobile products, such as mobile phones, personal digital assistants and other products, have become popular at an astonishing speed. People want to be able to grasp real-time information, but also hope to have real-time online support. Therefore, the Wireless Local Area Network (WLAN) and the third generation (3G) / fourth generation (4G) network that combine the Internet and wireless communication are just a solution to meet such needs of people. [0003] RF power amplifiers play a very important role in communication systems. In order to achieve better power-...

AI Technical Summary

Problems solved by technology

However, when the output power of the amplifier increases to a certain level (level), the load line of the amplifier operating in Class AB mode may enter the cut off region (cut off region), thereby generating gain compression (gain compression), This gain compression results in output power saturation

Since the DC operating point of the class AB amplifier is close to the cutoff region, when the output power of the class AB amplifier increases to a certain level, the gain compression mechanism in the cutoff region will limit the power gain and output power of the class AB amplifier

Images