US 7,321,272 B2
Device for detecting the temperature of an oscillator crystal
Markus Neumann, Nürnberg (Germany)
Assigned to NXP B.V., Eindhoven (Netherlands)
Appl. No. 10/551,966
PCT Filed Apr. 01, 2004, PCT No. PCT/IB2004/050380
§ 371(c)(1), (2), (4) Date Oct. 05, 2005,
PCT Pub. No. WO2004/091100, PCT Pub. Date Oct. 21, 2004.
Claims priority of application No. 03100986 (EP), filed on Apr. 11, 2003.
Prior Publication US 2006/0267702 A1, Nov. 30, 2006
Int. Cl. H03L 1/02 (2006.01); H03B 5/32 (2006.01)
U.S. Cl. 331—176  [331/66; 331/116 R; 331/158; 331/177 R] 11 Claims
OG exemplary drawing
 
1. A device for detecting the temperature of an oscillator crystal that has a crystal vibrator in an oscillator-crystal housing, in particular in a mobile radio apparatus, wherein a temperature sensor is arranged on a carrier in such a way that it is subjected to the same ambient temperature as the oscillator crystal, or the crystal vibrator, wherein the temperature sensor is provided on the same side of the carrier as the oscillator crystal, or the crystal vibrator respectively, and is not separated from the oscillator crystal, or from the crystal vibrator, by a wall or by intervening circuit elements, and that the temperature sensor is electrically connected parallel to the terminals of the crystal vibrator or to a series connection of the crystal vibrator and at least one coupling capacitor, wherein a characteristic curve of the temperature sensor is stored in an evaluation circuit coupled to the temperature sensor.