JPS6423169A - Pulse width distribution state detecting circuit - Google Patents

Abstract

PURPOSE:To obtain the frequency distribution of pulse width values at a high speed with small memory capacity by providing a pulse width measuring circuit, a memory, a timing control circuit, etc. CONSTITUTION:The pulse with measuring circuit 1 starts measuring pulse width with a command Ps from the timing control circuit 51, generate an end pulse Pe at the end of measurement, and outputs its measurement output Mi to the address bus of the memory 3. Then the circuit 51 generates a read/write signal R/W and accesses the memory 3 by using the output Mi as address information. Further, the contents of a specified address of the memory 3 are read out to a +1 arithmetic circuit 52, increased by 1, and stored again in the same address. Thus, the output Mi is used as the address information to access the memory 3, whose contents are increased by one in order to record the cumulative frequency of each pulse width value in the memory 3 directly. Therefore, the contents of the memory 3 are read out at the end of the measurement in the increasing order of the pulse width values to obtain the frequency distribution of the pulse width values.