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Automatic gain control method for digital signal

An automatic gain control and digital signal technology, applied in the direction of gain control, amplification control, electrical components, etc., can solve problems such as limitations, low position resolution, and inability to guarantee signals, and achieve fast automatic gain control, improve resolution, The effect of solving application limitations

Active Publication Date: 2011-02-02
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, many FPGA-based general-purpose commercial digital signal processing boards on the market do not have such a complex RF front-end, and do not have the function of adjusting RF signals.
Therefore, when the input radio frequency signal amplitude changes, the digital signal processing module cannot guarantee that the output signal can obtain the most effective bits, and the position resolution is relatively low. Applications are very limited

Method used

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  • Automatic gain control method for digital signal
  • Automatic gain control method for digital signal
  • Automatic gain control method for digital signal

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Embodiment Construction

[0029] Below, according to the accompanying drawings, preferred embodiments of the present invention are given and described in detail, so that the functions and features of the present invention can be better understood.

[0030] In order to measure the beam current position, the general commercial digital signal processing board needs to have four ADC chips respectively corresponding to the four channels, and respectively sample the electrode signal strengths detected by the four probes.

[0031] In order to obtain position signals of different rates such as turn-by-turn, fast acquisition, and full acquisition on the accelerator storage ring, it is necessary to further process the digital signal sampled by the ADC, which is carried out in the FPGA.

[0032] FPGA is widely used in various fields of digital signal processing because of its user programmability, high-speed parallelism and low power consumption. Unavoidable in digital signal processing is the bit truncation prob...

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Abstract

The invention discloses an automatic gain control method for a multichannel signed N-digit digital signal expressed by two's complement. The method comprises the following steps of: converting each signed N-digit digital signal into a corresponding absolute value signal; performing bit orient exclusive disjunction on the absolute value signal so as to obtain an or signal; generating a corresponding locking index signal for a specified position of the or signal; controlling a plurality of cascaded multiplexers by using the locking index signal; acquiring a signal S of an output end of the lastmultiplexer; and shifting each signed N-digit digital signal leftwards according to the signal S and outputting the signal. The method of the invention can be used for measuring a beam position and has the advantages of high beam position resolution, quick automatic gain control and the like.

Description

technical field [0001] The invention relates to an automatic gain control method for digital signals, in particular to an automatic gain control method for digital signals used in an accelerator digital beam position monitoring system (DBPM). Background technique [0002] The beam position measurement (BPM) system is an important part of the accelerator beam diagnosis system. Through this system, in addition to directly measuring the beam position, important parameters such as operating point, damping time, and phase diagram can also be calculated indirectly. At the same time, the system is also an important part of the accelerator track feedback system. [0003] The position of the electron beam on the accelerator in the beam vacuum tube is as follows: figure 1 As shown, its direction is perpendicular to the inside of the paper, and there are four button-type BPM probes A, B, C, and D. The signals detected by the four probes adopt the difference ratio and signal processi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/20
Inventor 赖龙伟冷用斌韩扣兄张宁
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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