| US 7,486,153 B2 | ||
| Circuit and method for controlling an oscillation loop | ||
| Franck Castex, Le Mans (France) | ||
| Assigned to NXP, B.V., Eindhoven (Netherlands) | ||
| Appl. No. 11/578,500 PCT Filed Apr. 04, 2005, PCT No. PCT/IB2005/051109 § 371(c)(1), (2), (4) Date Oct. 12, 2006, PCT Pub. No. WO2005/101646, PCT Pub. Date Oct. 27, 2005. |
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| Claims priority of application No. 04300203 (EP), filed on Apr. 13, 2004. | ||
| Prior Publication US 2007/0164827 A1, Jul. 19, 2007 | ||
| Int. Cl. H03L 7/099 (2006.01) | ||
| U.S. Cl. 331—185 [331/36 C; 331/158; 331/177 V] | 10 Claims |
| 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.
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