Mobile terminal and its stray filtering method

Abstract

The invention discloses a mobile terminal and a stray filtering method thereof. The mobile terminal supports GSM communication. The method includes the following steps: separating the GSM signal from other standard signals; performing filtering processing on the separated GSM signal to filter out spurs in the GSM signal; and filtering the filtered GSM signal The signal is output to the antenna. By applying the technical solution of the invention, the radiation spurious when the mobile terminal performs GSM communication can be reduced, and high-quality communication in the surrounding area can be ensured.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a mobile terminal and a stray filtering method thereof. Background technique [0002] Conducted spurious is a kind of harmonic generated by the nonlinear effect of components in the mobile terminal. The purpose of testing conducted spurious is to check whether the discrete radiation power at the antenna end of the mobile terminal complies with the communication specifications and national industry standards, so as to prevent the spurious radiation power from When the limit is exceeded, it will affect the terminal communication. Conducted spurious is a very important content that must be tested in the current conduction test. If the conducted spurious is not up to the standard, it will cause interference to other communicating terminals around and affect the quality of communication after being radiated through the antenna. [0003] In order to reduce the cost of the curre...

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Problems solved by technology

Figure 10 The disadvantage of the scheme shown is: the GSM power amplifier is integrated in the main antenna switch, and then reaches the antenna for transmission after passing through the common terminal. At this time, the harmonics generated by the power amplifier due to nonlinearity cannot be filtered out at the common terminal.

For example, in GSM900 communication, the general power amplifier supports four-level gain. If the temperature compensation is modified so that the power amplifier only supports three-level gain, the power can also reach the target power. In this way, the gain becomes lower and the spurs are naturally smaller. However, due to the three-level gain, To achieve high power, the power amplifier needs to work at full load, so there is a risk of the power amplifier being burned;

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