Patent ID: 6271730
Filing Date: 2001-08-07
Classification: H03B,H03K,H03L

Abstract:
A voltage-controlled oscillator in which an odd number of inverter circuits are connected with each other so as to form a ring, comprising:a first current-control element connected to an oscillation signal line which is used for connecting adjacent inverter circuits and a power-source-potential point, a current flowing through said first current-control element varying by a first control signal; anda second current-control element connected to the oscillation signal line and a ground point, a current flowing through said second current-control element varying by a second control signal, whereineach first current-control element includes a resistance element and a p-channel metal-oxide-semiconductor transistor;each second current-control element includes a resistance element and an n-channel metal-oxide-semiconductor transistor;the first control signal is input to the gate of said p-channel metal-oxide-semiconductor transistor; andthe second control signal is input to the gate of said n-channel metal-oxide-semiconductor transistor.