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Radio Frequency Automatic Gain Control System and Method

An automatic gain control and radio frequency technology, applied in the field of communication, can solve the problems of complex design of radio frequency automatic gain control and occupy a large chip area, and achieve the effect of optimized circuit design and reliable solution

Inactive Publication Date: 2011-12-21
SHANGHAI XINPUZHEN MICROELECTRONICS
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AI Technical Summary

Problems solved by technology

[0006] The problem to be solved by the present invention is to provide a system and method for implementing radio frequency automatic gain control in a digital manner, so as to solve the problems of complex design and large chip area occupied by the implementation of radio frequency automatic gain control in analog circuit mode

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  • Radio Frequency Automatic Gain Control System and Method

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Embodiment Construction

[0021] In view of the fact that analog circuits are mostly used in the prior art to realize the radio frequency automatic gain control loop, but there are problems such as complex design and large chip area occupied, the inventor of the present invention has improved the prior art and proposed a digital circuit The method realizes the automatic gain control of radio frequency, provides a simple, effective and reliable solution for the gain control design of the whole chip.

[0022] The radio frequency automatic gain control system and method thereof proposed by the present invention will be described in detail below through specific embodiments. In an example of the present invention, the radio frequency automatic gain control technology is applied in a China Mobile Multimedia Broadcasting (CMMB) mobile TV receiver chip.

[0023] figure 1 It is a structural schematic diagram of the radio frequency automatic gain control system of the present invention. Such as figure 1 As s...

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Abstract

The invention relates to a radio frequency (RF) automatic gain control (AGC) system and a method thereof. The system comprises a low-noise amplifier, an RF variable gain amplifier (VGA), an RF power detector and an RF AGC logic, wherein the low-noise amplifier is matched with the RF VGA and is used for carrying out AGC on a received RF signal; the RF power detector is used for detecting output signal energy of the RF VGA and outputting a detecting signal to the RF AGC logic after comparing the output signal energy with a preset value; and the RF AGC logic is used for respectively generating a control signal which is used for controlling a gain of the low-noise amplifier and a control signal which is used for controlling a gain of the RF VGA according to the detecting signal transmitted by the RF power detector. The RF AGC system and the method thereof provided by the invention realize RF AGC in a digital circuit manner, thus a simple, efficient and reliable solving scheme is provided for the AGC of an RF end of a mobile television receiver chip.

Description

technical field [0001] The invention relates to the communication field, in particular to a radio frequency automatic gain control system and method applied in radio frequency circuits. Background technique [0002] With the continuous development of technology, the market of radio frequency devices is expanding, and its application fields include traditional cellular phones and wireless phones, as well as other fields that are gradually developing, such as wireless local area network (Wireless Local Area Network, WLAN), radio frequency identification Tags (RFID), inventory monitors, satellite transceivers, and the burgeoning digital television world-wide. For example, the China Mobile Multimedia Broadcasting (CMMB) system is the first set of standards independently developed in China for various mobile terminals such as mobile phones, PDAs, digital cameras, and notebook computers. cover. On October 24, 2006, the State Administration of Radio, Film and Television officiall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/52
Inventor 王辉闫涛涛周健军
Owner SHANGHAI XINPUZHEN MICROELECTRONICS
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