Apparatus for injecting energy into crystal in crystal oscillator, and crystal oscillator

Abstract

Embodiments of the present application provide an apparatus for injecting energy into a crystal in a crystal oscillator, and a crystal oscillator. The apparatus includes: a crystal; a voltage-controlled oscillator configured to output an oscillation signal to the crystal; a ramp voltage generating circuit configured to generate a ramp voltage that changes over time; a first switch disposed between the ramp voltage generating circuit and the voltage-controlled oscillator; a first capacitor, where a first terminal of the first capacitor is connected to the first switch and the voltage-controlled oscillator, and a second terminal of the first capacitor is grounded; and a control circuit configured to control a status of the first switch according to a current through the crystal. Therefore, the apparatus can efficiently inject energy into the crystal.

Dependencies are inferred from the claim text.