Frequency-controllable oscillator

摘要

A frequency-controllable oscillator, having an oscillation device in which the oscillation frequency is controlled on the basis of a feedback current or voltage; a constant current source circuit; a charge device which charges a capacitor with a constant current from the constant current source circuit on the basis of an oscillation output from the oscillation device; and a control device which generates the current or voltage for control of the oscillation frequency of the oscillation device on the basis of electric charge stored in the capacitor and a predetermined reference value and which includes an integrator formed of an operational amplifier and an integrating capacitor, the Integrator performs integration on the basis of the charged voltage across the capacitor and the predetermined reference value, and the current or voltage for control of the oscillation frequency of the oscillation device is generated on the basis of an integrated output from the integrator.