POWER APPLY DEVICE OF AN RF-MODULE, SPECIALLY RELATED TO INCREASING USAGE TIME OF A BATTERY BY CONTROLLING POWER APPLIED TO THE RF-MODULE

摘要

PURPOSE: A power apply device of an RF-module is provided to control the power applied to the RF-module by employing a switch using a semiconductor element, thereby removing unnecessary power consumption and effectively controlling a switching time by using lock detection signals of PLLs as switch control signals. CONSTITUTION: A switch(100) controls DC power applied to a receiver(30), an FM detector(40), and a transmitter(90) by using lock detection signals of PLLs(50,70) as control signals. A lock detection circuit generates the lock detection signals having low levels in connection with the switch(100), and outputs the generated lock detection signals to the switch(100).