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简单输出滤波器消除隔离放大器的输出行波和保持完整带宽

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  • 标      签: 隔离 滤波器 放大器

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The ISO120/121/122 isolation amplifiers (ISO amps) have asmall (10-20mVp-p typ) residual demodulator ripple at theoutput. A simple filter can be added to eliminate the outputripple without decreasing the 50kHz signal bandwidth of theISO amp.The ISO120/121/122 is designed to have a 50kHz singlepole(Butterworth) signal response. By cascading the ISOamp with a simple 50kHz, Q = 1, two-pole, low-pass filter,the overall signal response becomes three-pole Butterworth.The result is a maximally flat 50kHz magnitude responseand the output ripple reduced below the noise level.
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