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IRS2334SPbF/MPbF
signal has a duration given approximately by the difference between the input signal and t FILIN . The lower
waveforms of Example 2 show an input signal with a pulse duration slightly longer than the filtering time t FILIN ; the
resulting output signal has a duration given approximately by the difference between the input signal and t FILIN,
much shorter than it should be.
Figure 10 shows the advanced input filter and the symmetry it produces on its output signal. The upper
waveforms of Example 1 show an input signal with a pulse duration much longer than the filtering time t FILIN ; the
resulting output signal has approximately the same duration as the input signal. The lower waveforms of Example
2 show an input signal with a pulse duration slightly longer than the filtering time t FILIN ; the resulting output signal
has approximately the same duration as the input signal.
Figure 9: Typical input filter
Figure 10: Advanced input filter
Short-Pulse and Noise Rejection
The advanced input filter that improves the input/output pulse symmetry of the signals processed by the HVIC
also helps the rejection of noise spikes and of short pulses on the input signals.
Input signals with a pulse duration less than the filtering time t FILIN will be filtered out. In Figure 11 Example 1
shows an input signal in the low state with superimposed positive noise spikes of duration less than t FILIN ; the
advanced input filter filters out the noise spikes and the output signal remains in the low state. Example 2 shows
an input signal in the high state with superimposed negative noise spikes of duration less than t FILIN ; the
advanced input filter filters out the noise spikes and the output signal remains in the high state.
Figure 11: Noise rejection of the advanced input filter
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