Patent ID: 7486153
Filing Date: 2009-02-03
Classification: H03B

Abstract:
1. 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 adapted to store the setting of the tunable capacitor unit, wherein the circuit comprises a supply line to the volatile storage unit providing a voltage of a first voltage level through a first switch, and at least another supply line to the other components of said circuit providing a voltage of a second voltage level through a second switch, said second voltage level being greater than the first voltage level, 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, through corresponding switches, independent of other components of said circuit.