Patent ID: 8400226

Claim:
An oscillation circuit operating between a ground voltage and a power voltage, and providing a pair of oscillating signals respectively at a first oscillation node and a second oscillation node; the oscillation circuit comprising: a first capacitor coupled between the first oscillation node and a first node; a second capacitor coupled between the second oscillation node and a second node; a switch circuit having two connection nodes and a control node, the two connection nodes respectively coupled to the first oscillation node and the second oscillation node, the switch circuit receiving an enable voltage at the control node and conducting between the two connection nodes on the enable voltage, wherein the enable voltage is greater than the power voltage; and a level shifter having an input node and an output node, the output node coupled to the control node; the level shifter receiving a control signal at the input node and providing a corresponding switch signal at the output node, wherein a voltage range of the control signal is from the ground voltage to the power voltage, and a voltage range of the switch signal is from the ground voltage to the enable voltage.