MULTI-FREQUENCY DROP-OUT DETECTING CIRCUIT BY USING ELECTRIC CURRENT CONTROL

摘要

The circuit for detecting the multiple frequency drop-out comprises an input section (1) for receiving the amplified input signal, a frequency integrating section (2) which integrates the input signal of the input section (1) according to the frequency, current control section (3) which decides the current for controlling the output level of the frequency integrating part, a bias section for deciding the operating point of the circuits in the input section, a high-speed comparator which compares the reference frequency with the integrated signal, a current control section (6), and a bias section (7) for deciding the operating point of the circuit in the high-speed comparator (7).