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在VCO环路滤波器上我们原来用的运放是AD797，现在换成TI的OPA211，没有改外围电路，其性能不如规格书标的参数(噪声、压摆率、带宽)，请问OPA211用在VCO环路滤波器上有哪些注意事项？或者有没有更好的型号推荐来替换AD797？
