All-digital frequency synthesis with DCO gain calculation

Details All-digital frequency synthesis with DCO gain calculation All-digital frequency synthesis with DCO gain calculation

2011-08-16

2011-08-16

Ha, Dac (Department: 2611)

Pulse or digital communications

Synchronizers

Frequency or phase control using synchronizing signal

C375S366000, C375S365000

Reexamination Certificate

active

08000428

ABSTRACT:
An all-digital frequency synthesizer architecture is built around a digitally controlled oscillator (DCO) that is tuned in response to a digital tuning word (OTW). In exemplary embodiments: (1) a gain characteristic (KDCO) of the digitally controlled oscillator can be determined by observing a digital control word before and after a known change (Δfmax) in the oscillating frequency; and (2) a portion (TUNE_TF) of the tuning word can be dithered (1202), and the resultant dithered portion (dkTF) can then be applied to a control input of switchable devices within the digitally controlled oscillator.

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