最近焊了几块dsp开发板，输出pwm波形不知为什么纹波特别大，开发板外围电路有AD和DA,焊接时是一级一级焊接的，先焊芯片供电电源电路，之后焊接AD外围电路，然后是晶振，测试各个输出电压均稳定无纹波，之后焊接dsp芯片，然后烧写程序，测试的pwm输出波形纹波很大，且此时dsp的供电芯片tps767d301输出1.8v和3.3v均存在较大电压纹波，不知是什么原因，请各位大神帮忙看看，万分感谢！
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