Radio frequency amplification circuit

Abstract

The invention discloses a radio frequency amplification circuit, which comprises a radio frequency power transistor, a power supply filter circuit, a bias circuit, an LLC resonant filter input circuit and an LLC resonant filter output circuit, and is characterized in that the power supply filter circuit and the LLC resonant filter output circuit are both connected with a drain electrode of the radio frequency power transistor; the bias circuit and the LLC resonant filtering input circuit are both connected with the grid electrode of the radio frequency power transistor, and the source electrode of the radio frequency power transistor is grounded. The LLC resonant filtering input circuit is used for carrying out band-pass filtering on input signals, input and output of signals with specific frequency can be achieved, electromagnetic interference of unnecessary signals on a radio frequency circuit can be prevented, and a good band-pass filtering function is achieved; the LLC resonant filtering output circuit is used for providing impedance standards, input-output impedance matching of the radio frequency power transistor can be achieved in combination with a Smith chart, the purpose of amplifying needed power is finally achieved, and power balance of the radio frequency amplification circuit is guaranteed.

Description

technical field [0001] The invention relates to the technical field of radio frequency amplification, in particular to a radio frequency amplification circuit. Background technique [0002] In the design of the RF power amplifier circuit, in order to fully realize the power amplification function of the RF transistor, it is necessary to selectively input a signal of a specific frequency, and the impedance matching of the RF circuit must also be taken into account. Specifically, in terms of input signal selection, the signals required by the circuit are amplified to achieve power amplification and transmission, while unnecessary signals are filtered out, thereby reducing the electromagnetic interference of radio frequency circuits caused by transmission or amplification of unnecessary signals influences. In terms of RF power amplification, in order to achieve a specific output power, it is necessary to use the Smith chart to achieve input and output impedance matching of the...

AI Technical Summary

Problems solved by technology

[0003] However, in the existing RF power amplifier circuit, when the signal input of a specific frequency is realized, the circuit conversion structure is complicated, and the signal input of a specific frequency cannot be accurately realized, and the electromagnetic interference is strong. In addition, the impedance standard cannot be provided, resulting in the entire power The amplifier circuit is not balanced enough

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