Patent ID: 6879218
Filing Date: 2005-04-12
Classification: H03B,H03C,H03L

Abstract:
1. A frequency modulation corrector for use with a voltage-controlled oscillator including a parallel connection of a first capacitor element having a capacitance changeable with a first control voltage signal controlling an oscillation frequency and a second capacitor element having a capacitance changeable with a second control voltage signal controlling frequency modulation, comprising: a frequency setting circuit for generating and outputting DC signals based on a predetermined reference voltage signal and on a voltage signal which is in keeping with a desired frequency; a modulation degree setting circuit for amplifying AC signals and for generating and outputting a modulation adjusting signal used for controlling the degree of the frequency modulation; and a signal summation circuit for summing the DC signals and the modulation adjusting signal to generate and output the second control voltage signal; said frequency modulation correction circuit being arranged outwardly of said voltage-controlled oscillator.