Method and apparatus for detecting interruption of an input signal

摘要

A first amplifier receives an input signal and outputs an amplified input signal. A peak detector receives the amplified input signal and outputs a signal that represents a peak level of the amplified input signal. A threshold generator generates a threshold signal. A second amplifier receives the threshold signal and outputs an amplified threshold signal. A comparator compares the signal output from the peak detector with the amplified threshold signal to detect loss of the input signal.