Hi Sir,
Can suggest high speed OP Amp, let me replace ADI OP Amp, thanks.
AD844
AD845
AD817
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Hi Kuo,
For the AD817 (+/-18V supplies, 350 V/us slew rate, good video performance, 50MHz, unlimited cap load, 7.5mA supply current), the closest device is the LM7171 (which is not really rated for "unlimited cap load" but might otherwise fit).
However, the LM8272 (24V max operating supply, 13MHz bandwidth, 12 V/us) is the closest unlimited cap load drive device I can find. If they can tolerate a higher supply current (9.5mA), the THS4041, with its cap load drive capability, might be the best fit
For the AD844, the LM6171 you noted, or the LM7171 may be good fits, but their offset voltage (3mV and 1mV respectively) are higher than AD844 (150uV max).
Regards,
Hooman