Patent ID: 7164326
Filing Date: 2007-01-16
Classification: H03B

Abstract:
1. An oscillator circuit comprising: an oscillator including an oscillating transistor through which an oscillating current flows; and a current mirror circuit via which said oscillating current is adjusted by a resistance consisting of an external resistor to adjust an oscillating frequency of said oscillator, wherein said current mirror circuit comprises: a first reference transistor through which a current adjusted by said external resistor flows; a first mirror transistor connected to said oscillating transistor in series such that an output signal from said oscillating transistor is fed back to said oscillator therethrough; wherein the gate of said first reference transistor and the gate of said first mirror transistor are connected with each other; and a second current mirror circuit including a second reference transistor, a parasitic element connected to said second reference transistor in series, and a second mirror transistor, wherein said second mirror transistor is connected to said first reference transistor in series.