Power detection circuit and method of power amplifier

Abstract

The embodiment of the invention discloses a power detection circuit and method of a power amplifier. The power detection circuit comprises a biasing circuit, a rectifying circuit, a direct current offset circuit, an offset compensation circuit and a gain control circuit; the biasing circuit is respectively connected with the rectification circuit and the direct current offset circuit, the direct current offset circuit is respectively connected with the offset compensation circuit and the rectification circuit, and the gain control circuit is respectively connected with the rectification circuit and the power amplifier.

Description

technical field [0001] The embodiments of the present application relate to the technical field of power amplifier detection, and in particular to a power detection circuit and method of a power amplifier. Background technique [0002] Modern communication systems use more and more complex modulation methods, making the linearity performance requirements of radiofrequency power amplifiers (radiofrequency power amplifiers, RF PAs) higher and higher. In order to ensure the efficiency of PAs and improve the linearity performance of power amplifiers is an urgent problem to be solved. [0003] The existing power detection circuit used in wireless communication system to realize linear bias is usually composed of bias circuit, gain control circuit and rectification circuit, such as figure 1 As shown, when there is a radio frequency signal input, the radio frequency signal is converted into a DC current through the rectification circuit, and the current output by the rectification...

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Problems solved by technology

[0003] The existing power detection circuit used in wireless communication system to realize linear bias is usually composed of bias circuit, gain control circuit and rectification circuit, such as figure 1 As shown, when there is a radio frequency signal input, the radio frequency signal is converted into a DC current through the rectification circuit, and the current output by the rectification circuit includes a static current and a DC current, that is, the detection current amplified and output by the gain control circuit includes at least a static current. Therefore, The range of current compensation for power amplifiers by using the detection current is limited, and because the compensation requirements of different amplifiers will vary according to the input power, the traditional power detection circuit has a single compensation function for different amplifiers and has low flexibility.

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