放大器一级,使用的光电二极管为5V偏压,0.8pf。在使用opa847作为一级放大电阻选用的为1K,发现使用1K的增益不能让OPA847稳定,想咨询有没有更合适的芯片作为一级放大,放大1K增益,带宽至少能达到400M,且反馈电容也比较适合的芯片。
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