Radio frequency front-end device, gain control method and system thereof

Abstract

The invention provides a radio frequency front-end device, a gain control method and a system thereof, which are applicable to the technical filed of radio frequency signal processing, wherein the method comprises the following steps: receiving decrement fine adjustment signals; judging whether the sum of the decrement corresponding to the decrement fine adjustment signals and the finely adjusted decrement exceeds a preset adjustable range value or not; and controlling the decrement of the current decrement change of a controllable attenuator corresponding to the decrement fine adjustment signals without using a traditional pi type attenuator for realizing the fine adjustment on the gain of the radio frequency front-end device when the judgment result shows that the sum of the decrement corresponding to the decrement fine adjustment signals and the finely adjusted decrement does not exceed the preset adjustable range value. Thereby, the invention avoids the phenomena such as rosin welding joint, leak welding joint or false welding joint and the like caused by resistor change are avoided, the repeated welding operation is not needed, and the reliability and the pass rate of products are improved.

Description

technical field [0001] The invention belongs to the technical field of radio frequency signal processing, and in particular relates to a radio frequency front-end device and a gain control method and system thereof. Background technique [0002] At present, in the design of RF products, no matter it is the power amplifier transmitting circuit or the RF front-end receiving circuit, such as: duplex module, duplex filter module, etc., gain control is the key point to be considered. For this reason, the RF front-end device is equipped with CNC Or a gain control system composed of a voltage-controlled attenuator. [0003] When the link achieves a high gain (generally above 30dB), the amplifying link needs to be implemented in multiple stages. However, because the circuit is multi-stage cascaded, the gain of the whole machine link will have a certain discrete fluctuation with the consistency of the chip, which requires the gain control system to realize the control of the RF fron...

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Problems solved by technology

[0005] The purpose of the embodiment of the present invention is to provide a gain control method of a radio frequency front-end device, aiming at solving the problem that in the prior art, the user uses a π-type attenuator to fine-tune the gain of the radio frequency front-end device, which may easily cause false soldering, missing soldering or false Welding and other phenomena, and repeated welding actions greatly reduce the reliability and qualification rate of the product

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