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This circuit measures high speed clocks or similar devices by obtaining and storing minimum and maximum pulse widths delivered by the measured clock.
English (United States)
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Pulse-Width Measuring Circuit
This circuit measures high speed clocks or similar devices by obtaining and
storing minimum and maximum pulse widths delivered by the measured clock.
Reference and measure pulses from the device to be measured enter the
circuit via inputs 1 and 2. Mixer 3, controlled by appropriate control signals from
terminal 4, sends set and reset signals to trigger 5. In addition, a control signal
defines the pulse parameters to be evaluated. Trigger 5 transforms the set/reset
signal pair into start/ stop signals fed to 16-bit-counter 6, which is driven by a 100
MHz oscillator. The count obtained during each start/stop interval is stored in a
count register and transferred to comparators 7 and 8.
Comparator 7 checks if the obtained count is smaller than the smallest
previously measured count. If so, the new smaller count is stored in minimum
register 9. Comparator 8 checks if the obtained count is larger than the largest
previously measured one. If so, the new larger count is stored in maximum
register 10. Thus, the circuit continuously monitors the pulse widths, and stores
the digitized minimum and maximum pulse-width values. The minimum and
maximum values can be obtained from respective output terminals 11 and 12,
and compared with specification values.
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