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Circuit for filtering high-frequency harmonic component of power amplifier and power amplifier

A high-frequency harmonic component and power amplifier technology, which is applied in the field of microelectronics, can solve problems affecting circuit performance and achieve the effect of improving performance and filtering

Inactive Publication Date: 2020-04-14
中科威发半导体(苏州)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the third harmonic or other higher harmonics near 7.35GHz will be relatively large, which will affect the circuit performance

Method used

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  • Circuit for filtering high-frequency harmonic component of power amplifier and power amplifier
  • Circuit for filtering high-frequency harmonic component of power amplifier and power amplifier

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment one: as attached figure 1 As shown, a power amplifier includes a main amplifying circuit, a circuit for filtering high-frequency harmonic components of the power amplifier and a parallel resonant load circuit.

[0020] The main amplifying circuit includes a first field effect transistor M1 , a second field effect transistor M2 , a third field effect transistor M3 and a fourth field effect transistor M3 forming a differential cascode structure. The source of the first FET M1 and the source of the second FET M2 are commonly grounded, the source of the third FET M3 is connected to the drain of the first FET M1, and the third FET The drain of M3 is connected to one end of the CLC series resonant circuit, the source of the fourth field effect transistor M4 is connected to the drain of the second field effect transistor M2, and the drain of the fourth field effect transistor M4 is connected to the CLC series resonant circuit connected at the other end.

[0021] T...

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PUM

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Abstract

The invention relates to a circuit for filtering a high-frequency harmonic component of a power amplifier, and the circuit comprises a CLC series resonance circuit of which the resonance frequency ismatched with the high-frequency harmonic component of the power amplifier, and the CLC series resonance circuit comprises a first adjustable capacitor, an inductor and a second adjustable capacitor which are sequentially connected in series. The capacitance value of the first adjustable capacitor is equal to that of the second adjustable capacitor; and both the first adjustable capacitor and the second adjustable capacitor adopt varactors. The invention further relates to the power amplifier comprising the circuit for filtering the high-frequency harmonic component of the power amplifier. According to the invention, the resonant frequency of the CLC series resonance circuit is always matched with the high-frequency harmonic component of the power amplifier through the arrangement of the adjustable capacitor, so the higher harmonic component of the power amplifier can be better filtered, and the performance of the power amplifier is improved.

Description

technical field [0001] The invention belongs to the field of microelectronics, and specifically relates to a circuit structure for filtering out high-order harmonic components of a power amplifier and a power amplifier using the same. Background technique [0002] A power amplifier, such as a power amplifier (Power Amplifier, PA) applied to Wi-Fi, operates at a frequency of 2.4GHz-2.5GHz. The circuit generally adopts a differential structure, and even harmonics are approximately equal in amplitude and opposite in phase at the differential output terminals of the differential signal, so they are almost cancelled. However, the third harmonic or other higher harmonics around 7.35GHz will be relatively large, which will affect the circuit performance. Therefore, it is necessary to design a solution to reduce the high-order harmonics of the power amplifier. Contents of the invention [0003] The purpose of the present invention is to provide a circuit for filtering high-frequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03F1/02
CPCH03F1/0205H03F3/45179
Inventor 陈郑
Owner 中科威发半导体(苏州)有限公司
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