matching circuitry

Abstract

A matching circuit system includes a first inductor, a first capacitor, a second inductor, a second capacitor, a third inductor, and a third capacitor. The first inductor has a first terminal and a second terminal. The first capacitor has a first terminal coupled to the first terminal of the first inductor, and a second terminal. The second inductor has a first terminal coupled to the second terminal of the first capacitor, and a second terminal coupled to ground. The second capacitor has a first terminal coupled to the first terminal of the first capacitor, and a second terminal. The third capacitor has a first terminal coupled to the second terminal of the second capacitor, and a second terminal. The third inductor has a first terminal coupled to the first terminal of the second capacitor, and a second terminal coupled to the second terminal of the second capacitor.

Description

technical field [0001] The invention relates to a matching circuit system, especially a combination of multiple inductors and capacitors to suppress the second harmonic and the third harmonic in the input signal of the input stage circuit and match the input of the input stage circuit Impedance matching circuit system. Background technique [0002] Please refer to figure 1 , figure 1 It is a schematic diagram illustrating a matching circuit 100 for the prior art. The matching circuit 100 includes a first inductor 102 , a first capacitor 104 , a second capacitor 106 and a second inductor 108 . The first inductor 102 and the first capacitor 104 are used to match the input impedance GammaL of the input stage circuit 116 (such as a power amplifier or amplifier), and form a low-pass filter to filter out the high frequency components of the input signal IS of the input stage circuit 116 . The second capacitor 106 is used to block the DC component of the input signal IS of the...

AI Technical Summary

Problems solved by technology

[0003] Although the energy of the input signal IS can be transferred through the matching circuit 100 to the output stage circuit 118 with 50Ω impedance (such as an antenna, a switch or a next-stage circuit), the matching circuit 100 cannot significantly suppress the second harmonic of the input signal IS and The third harmonic, causing the signal received by the output stage circuit 118 to have harmonic distortion

Therefore, in the prior art, the signal received by the output stage circuit 118 may not comply with the FCC (Federal Communications Commission, FCC) communication specification.

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