Patent ID: 8416028
Filing Date: 2013-04-09
Classification: H03B

Abstract:
1. A voltage controlled oscillator, comprising: a resonance part having a variable capacitance element, whose electrostatic capacitance varies in accordance with a control voltage for frequency control input from the outside, an inductance element, and a fixed capacitance element that has a fixed electrostatic capacitance, and in which a series resonance frequency is adjusted in accordance with the electrostatic capacitance; and a feedback part amplifying a frequency signal from said resonance part and making the amplified signal to be fed back to said resonance part; and wherein the inductance element in said resonance part is a conductive line formed on a quartz-crystal substrate; wherein the quartz-crystal substrate is provided on a base substrate made of a dielectric, and on the base substrate are provided the variable capacitance element, feedback part and peripheral component; wherein the series resonance frequency is 5 Ghz or more and wherein said fixed capacitance element is formed from a pair of comb-like conductive paths which intersect with a space therebetween, and which are provided on the quartz-crystal substrate on which said inductance element is formed.