Resonant oscillator with start up and shut down circuitry
AssigneeApple Inc.
InventorsCatherine S. Chou, William C. Athas, Heather R. Sullens
Life of this patent
Estimating the term…
Loading patent…
AssigneeApple Inc.
InventorsCatherine S. Chou, William C. Athas, Heather R. Sullens
Estimating the term…
A system which starts up and shuts down a resonant oscillator circuit. During start up, the system operates a driving circuit, which is external to the resonant oscillator circuit, wherein the driving circuit uses a first clock signal to control a first phase output of the resonant oscillator circuit. At the same time, the driving circuit uses a second clock signal to control a second phase output of the resonant oscillator circuit, wherein the first and second clock signals have opposite phases. While the first and second phase outputs are being controlled, the system ramps up an input voltage, which is used to power the resonant oscillator circuit, wherein the ramping takes place across multiple initial oscillation periods. During shut down, the system shuts down the resonant oscillator circuit by ramping down the input voltage. Next, the system clamps the first and second phase outputs to a fixed voltage.
A method for starting up a resonant oscillator circuit, the method comprising:
A resonant oscillator circuit, comprising:
A resonant oscillator circuit, comprising:
Dependencies are inferred from the claim text.