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OPA627和OPA603组合放大器提供传统和电流反馈两种运
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2009-06-03
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Classical op amps such as the OPA627 have excellent
performance in applications where the required gain bandwidth
is low compared to the gain-bandwidth product of the
op amp. However, increasing closed-loop gain decreases the
error-reducing loop gain. Furthermore, starting at relatively
low frequencies, the loop gain rolls-off at 20dB/decade of
signal frequency increase. In combination these effects can
produce significant errors, especially at higher frequencies
where the loop gain can be very low.
performance in applications where the required gain bandwidth
is low compared to the gain-bandwidth product of the
op amp. However, increasing closed-loop gain decreases the
error-reducing loop gain. Furthermore, starting at relatively
low frequencies, the loop gain rolls-off at 20dB/decade of
signal frequency increase. In combination these effects can
produce significant errors, especially at higher frequencies
where the loop gain can be very low.
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