Circuit and method for controlling an oscillation loop
AssigneeNXP B.V.
InventorFranck Castex
Life of this patent
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Abstract
The circuit for controlling the oscillation frequency of an oscillation loop (66) has among others the following components—a first tunable capacitor unit (80) for providing a selectable amount of capacitance to the oscillator loop in accordance with a stored setting, and for controlling the oscillation frequency of the oscillator loop, and—a volatile storage unit (84) adaptated to store the setting of the tunable capacitor unit. The circuit further comprises a supply line (52) to the volatile storage unit and at least one other supply line (44) for the other components of said circuit. The supply line to the volatile storage unit is independent of said at least one other supply line, so that the volatile storage unit can be powered independently of other components of said circuit.
Claims10
A circuit for controlling the oscillation frequency of an oscillation loop, the circuit having among others the following components:
- a first tunable capacitor unit for supplying a selectable amount of capacitance to the oscillation loop in accordance with a stored setting, and for controlling the oscillation frequency of the oscillation loop, and
- a volatile storage unit adaptated to store the setting of the tunable capacitor unit, wherein the circuit comprises a supply line to the volatile storage unit and at least another supply line to the other components of said circuit, the supply line to the volatile storage unit being independent of said at least one other supply line, so that the volatile storage unit can be powered independently of other components of said circuit.
A method of controlling the oscillation frequency of an oscillation loop, the method comprising the steps of:
- tuning a tunable capacitor unit to provide a selectable amount of capacitance to the oscillation loop in accordance with a stored setting, to control the oscillation frequency of the oscillation loop, and
- loading the setting of the tunable capacitor unit in a volatile storage unit, wherein the method further comprises steps of cutting off the supply line to the other components needed to control the oscillation frequency of the oscillation loop and simultaneously continuing to supply power to the volatile storage unit.
Dependencies are inferred from the claim text.