PULSE-MODULATED SIGNAL DEMODULATING CIRCUIT, PHOTODETECTING CIRCUIT PROVIDED WITH SAME, AND ELECTRONIC EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To provide a pulse-modulated signal demodulating circuit capable of reducing noise components of an output signal.

SOLUTION: The pulse-modulated signal demodulating circuit is equipped with an integrating circuit INT1 which generates a 1st pulse signal having pulses with a pulse width corresponding to the number of successive pulses of a pulse-modulated signal PMS, an integrating circuit INT2 which generates a 2nd pulse signal having pulses corresponding to the pulse width of nonindependent pulses of the 1st pulse signal by removing pulses independent of other pulses and having width equal to or smaller than a specified pulse from the 1st pulse signal and mutually coupling the nonindependent pulses of the 1st pulse signal having pulses corresponding to the pulse width of pulses independent of the other pulses of the 1st pulse signal and having width larger than the specified pulse on the basis of the pulses, and an integrating circuit INT3 which generates a 3rd pulse signal being a signal obtained by adjusting the pulse with of the 2nd pulse signal according to its pulse width.

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