研究了程控增益在红外触摸屏中的应用.整个系统采用STM32微处理器作为主控制单元,信号处理部分增加了数字电位器,并使其与运算放大器构成增益可变放大器.通过实验,程控增益的方法能大大提高红外触摸屏的成品率和寿命,同时对抗环境光干扰也有一定的改善作用.%Programmable gain method on the infrared touch screen is researched in this paper. The system chooses the STM32 microcontroller as the main control unit, and adds digital potentiometers to the signal processing part, which along with OP AMP constitutes the variable gain amplifier. Concluded from the experiment, programmable gain method can greatly increase the yield and lifetime of the infrared touch screen, and can effectively improve its anti-interference of light.
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