APPARATUS FOR DETECTING A FREQUENCY OF SIGNAL

摘要

The present invention relates to a frequency detection apparatus which detects a frequency as to an input signal using a low pass equalizer and a high pass equalizer as to a continuous wave (CW) inputted from an RF system. According to the frequency detection apparatus, if the CW signal is inputted to an input port of a directional coupler, the CW signal is provided to a power splitter and then is split into two signals which are provided to the low pass equalizer and the high pass equalizer. Each signal whish has passed the low pass equalizer and the high pass equalizer is detected as a voltage through a first voltage detector and a second voltage detector respectively, and two output voltages are amplified and outputted after a voltage difference between the two output voltages is detected by a voltage difference detection part comprising an operational amplifier. The voltage difference detected by the voltage difference detection part which uses a voltage according to the amplitude of an input signal as a reference voltage is provided by being converted into a frequency using a previously established table.