LOCAL OSCILLATION STABILIZER

摘要

PROBLEM TO BE SOLVED: To provide a local oscillation stabilizer that can lock a local oscillating frequency of an optional channel only with a simple setting. SOLUTION: Focusing attention on the utilization of a reference signal with a frequency of 10 MHz having higher precision than the frequency of a local oscillation signal to stabilize the oscillated frequency of a local oscillator 11, a frequency divider 13 and a comb generator 14 convert the reference signal received by a waveform shaping device 12 into a signal with a multiple frequency equal to the oscillated frequency by the local oscillator 11, a phase comparator 15 compares a phase of the multiple frequency signal with a phase of the local oscillation signal generated by the local oscillator 11, a loop filter 17 converts a difference signal equivalent to the phase error into a control voltage and given to the local oscillator 11 as its control voltage so as to control the oscillated frequency of the local oscillator 11 with the precision of the reference signal.