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一般来说PSRR是指Power supply rejection ratio
即PSRR=电源的变化量/输出电压的变化量...
但是运放LMH6518的PSRR参数不是很理解啊...这意思是说只变了共模量么???
假如是5V供电,有1mv的纹波,那么到输出端的纹波将扩大70dB????
关于运放的DC-PSRR请参阅:
http://www.deyisupport.com/question_answer/analog/amplifiers/f/52/t/19458.aspx
AC-PSRR请参阅:
http://www.deyisupport.com/question_answer/analog/amplifiers/f/52/t/19467.aspx
1mV的纹波要看纹波的频率是多少,如PSRR在纹波频率上的值为-60dB。则1mV纹波会引起运放输入端产生1uV的纹波,这个纹波等效输入的失调电压。这个电压要经过你的放大电路放大到输出端的。