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为了方便在实验室中对TD-SCDMA小区切换性能进行测试,提出了一种可产生规律变化射频信号的双通道可编程衰减器。该方案利用高速单片机C8051F120控制数字衰减器PE4306输出规律变化的射频信号,用户终端根据这种射频信号的变化产生小区切换。文章重点介绍了可编程衰减器的硬件设计原理和软件设计方法,给出了硬件原理框图和关键电路,说明了软件设计的关键点,并给出了实验结论。实验表明该衰减器具有较好的使用价值。
In order to test the handover performance of TD-SCDMA cells conveniently in the laboratory, a dual-channel programmable attenuator capable of generating regularly varying radio frequency signals is proposed. The program uses high-speed microcontroller C8051F120 digital attenuator PE4306 output changes in the law of the RF signal, the user terminal based on this radio frequency signal change cell switching. This paper mainly introduces the hardware design principle and software design method of programmable attenuator, gives the hardware block diagram and key circuit, explains the key points of software design, and gives the experimental conclusion. Experiments show that the attenuator has good value.