Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2011-07-19
2011-07-19
Nguyen, Hai L (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S148000
Reexamination Certificate
active
07982510
ABSTRACT:
The frequency synthesizer for implementing a self-calibration method includes (i) a first phase lock loop comprising: a reference oscillator, a phase comparator, a first charge pump, a first loop filter, a voltage controlled oscillator, and a multimode divider counter controlled by a modulator and connected to the phase comparator; (ii) a high frequency access comprising a digital-analogue converter connected to an input of the voltage-controlled oscillator; (iii) a second charge pump connected to the phase comparator; and (iv) a second loop filter in the high frequency access. The second charge pump forms, when switched on, a second phase lock loop with the second loop filter. To calibrate gains of the converter, a voltage comparator compares an output voltage of the converter with a voltage stored in the second loop filter, after disconnecting the second charge pump from the second phase lock loop, previously locked onto a determined output frequency.
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European Search Report issued in corresponding application No. EP08165830 completed May 13, 2009.
Griffin & Szipl, P.C.
Nguyen Hai L
The Swatch Group Research and Development Ltd
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