Patent ID: 7843279

Claim:
A low temperature coefficient oscillator, comprising: a current generator, generating a first current, a second current, a third current and a fourth current according to a control signal; a first voltage generator, coupled to the current generator, and generating a first voltage according to the first current; a second voltage generator, coupled to the current generator, and generating a second voltage according to the second current and a frequency signal; an amplifier, generating the control signal according to the first voltage and the second voltage; a first resistor, having a first terminal receiving the third current, and a second terminal coupled to ground; a first switch, having a first terminal coupled to the first terminal of the first resistor, wherein the first switch is conducted or not according to the frequency signal; a first capacitor, having a first terminal coupled to a second terminal of the first switch, and a second terminal coupled to the ground; and an oscillating unit, generating the frequency signal according to the fourth current and a voltage of the first capacitor.