Apparatus and method for improving the resolution with which a test signal is counted

摘要: Apparatus and method for counting frequency of a signal with improved resolution. Frequency counters (10, 60, 100) accumulated clock cycles from reference oscillator (20) during sample interval. In the simplest form counter, is inverted both noninverted are in separate (40 44). The counts totaled summing circuit (48) divided by two to determine their average, thereby doubling resolution counter. A more complex embodiment invention corrects raw count an input (12) that extended interval defined successive rising edges (114). fractional portion cycle waveform occurred prior beginning added after end subtracted. These portions as ratios partial full cycles. number occurring between edge next signal, while signal. One-half logic circuits (126 136) double counter (122) (142), which determined.