DIGITAL FREQUENCY FILTER
Original Publication Date: 2000-May-01
Included in the Prior Art Database: 2002-Sep-19
In a mixed analog to digital design, where the digital domain is performing a frequency measurement on a signal that comes from the analog domain, a comparator is required to create the signal for the digital side. In order to avoid false transition coming through to the logic, there is a need for hysteresis around the threshold point in the comparator and filtering of the input signal to avoid false reading the frequency.