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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
消耗积分:5 |
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大小:177 |
2009-06-04
张亮
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The ISO120/121/122 isolation amplifiers (ISO amps) have a
small (10-20mVp-p typ) residual demodulator ripple at the
output. A simple filter can be added to eliminate the output
ripple without decreasing the 50kHz signal bandwidth of the
ISO amp.
The ISO120/121/122 is designed to have a 50kHz singlepole
(Butterworth) signal response. By cascading the ISO
amp 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 response
and the output ripple reduced below the noise level.
small (10-20mVp-p typ) residual demodulator ripple at the
output. A simple filter can be added to eliminate the output
ripple without decreasing the 50kHz signal bandwidth of the
ISO amp.
The ISO120/121/122 is designed to have a 50kHz singlepole
(Butterworth) signal response. By cascading the ISO
amp 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 response
and the output ripple reduced below the noise level.
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