Patent ID: 7332944
Filing Date: 2008-02-19
Classification: G11B,H03K,H03L

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