The principle and realization fashion of pulse frequency modulation
Abstract
This article described the principle and realization and realization means of the pulse frequency modulation.Simply introducing the common pulse frequency modulation means by the optical communication system the three main modulation technique used in analog transmission of and doing a simple comparison; Analyzing the principle of the pulse frequency modulation optical transmission systems and system modules,deeply researching the basic principles of frequency modulation;Introduced adouble-steady-state trigger 74LS123 and the LM741 comparator pin function,and by 74LS123 and LM741 to achieve pulse frequency modulation;Finally,switching amplifier Class Eamplifier to increase its power output,making this system in the optical fiber communication technologies are widely applied.
Keywords: optical fiber communication;pulse frequency modulation;voltage comparator;steady-trigger;
