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Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2002-Jan-07
Document File: 3 page(s) / 150K

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Thomas J. Hoppal


This publication describes an inexpensive circuit for an enhanced frequency/period counter. Communi- cations analyzers are required to have either a frequency or period counter to make frequency measurements of such signals as the intermediate frequencies (IF), fre- quency error of input signals, modulating signal and tone sequences. These tests require frequency measurements for input signals ranging from 1 Hz to 1 MHz with as much as 0.1 Hz resolution. In particular, tone sequences become very difficult to measure since tone durations can be as short as a few milliseconds. Frequency coun- ters are excellent for measuring high freuency signals while period counters are excellent for measuring low frequency input signals. This circuit performs both func- tions with almost the same hardware, provides a period counter which can measure the frequency of every input cycle and provides 32 bit counters for both frequency and period counting functions.