Circuit, mobile terminal and signal processing method for improving main set receiving sensitivity
A technology of main set reception and sensitivity, which is applied in the field of mobile terminals, and can solve problems such as failure to improve sensitivity, deterioration of main set reception sensitivity, and insufficient isolation of duplexers.
Active Publication Date: 2020-06-23
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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Problems solved by technology
[0003] The common FDD main set receiving circuit design is to add an external low noise amplifier (LNA, Low Noise Amplifier) to the back end of the duplexer to improve the main set receiving sensitivity performance, but often due to the insufficient isolation of the duplexer, the TX (Transmit, Transmit) The signal leaked on the RX (Receive, receive) band passes through the back-end LNA, which not only fails to achieve the target expectation of improving sensitivity, but also causes the receiver sensitivity of the main set to deteriorate
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[0022] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.
[0023] The circuit for improving the receiving sensitivity of the main set provided by the embodiment of the present invention is applied to a radio frequency front end of a mobile terminal, and the mobile terminal may be a mobile terminal with a call function such as a mobile phone or a notebook.
[0024] see figure 1 , figure 1 The schema...
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The invention provides a circuit for improving main set receiving sensitivity, applied to the technical field of mobile terminals. The method comprises an antenna switch module, a duplexer, a narrowband low noise amplifier, a high-performance filter and a radio frequency transceiver, wherein the duplexer is separately connected with the antenna switch module, the narrowband low noise amplifier andthe radio frequency transceiver; the high-performance filter is separately connected with the narrowband low noise amplifier and the radio frequency transceiver; and the receiving signal band supported by the narrowband low noise amplifier is the same as the filtering band of the high-performance filter. The embodiment of the invention further discloses a mobile terminal and a signal processing method. The problem of isolation of transmitted and received signals of the duplexer caused by the increase of an external LNA design for inhabiting the FDD band can be solved, and the main set receiving sensitivity can be improved.
Description
technical field [0001] The invention belongs to the technical field of mobile terminals, and in particular relates to a circuit for improving the receiving sensitivity of a main set, a mobile terminal and a signal processing method. Background technique [0002] Frequency Division Duplexing (FDD, Frequency Division Duplexing) is a kind of full-duplex communication technology used in mobile communication systems, which uses two independent channels to transmit information downwards and upwards respectively. To prevent mutual interference between adjacent transmitters and receivers, a guard band exists between the two channels. [0003] The common FDD main set receiving circuit design is to add an external low noise amplifier (LNA, Low Noise Amplifier) at the back end of the duplexer to improve the main set receiving sensitivity performance, but often due to the insufficient isolation of the duplexer, the TX (Transmit, Transmit) The signal leaked on the RX (Receive, receive...
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IPC IPC(8): H04B1/525H04L5/14
Inventor 巫国平
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD