H - Electricity – 03 – L
Patent
H - Electricity
03
L
H03L 7/16 (2006.01) H03L 7/113 (2006.01) H03L 7/197 (2006.01)
Patent
CA 2123477
A fractional - N frequency synthesizer comprises a voltage-controlled oscillator(VCO) for generating an output signal in response to a control voltage derived by a digital-to-analog converter from a digital error signal. The error signal is derived by a differencing device which subtracts a digital signal representing a desired frequency of the output signal. The digital signal representing the output signal frequency is derived by a frequency discrimination device which determines the instant frequency of the analog output signal and provides a corresponding digital representation with zero static frequency error. In preferred embodiments, the frequency discrimination device is a delta-sigma frequency synthesizer is combination with a decimator. This frequency synthesizer configuration avoids deficiencies due to non-linearity and noise sensitivity of analog phase detectors. The invention also provides a frequency discriminator comprising a feedforward path including a multimodulus divider means for dividing the frequency of a digital signal (F0) in dependence upon a division ratio control signal, comparison means for comparing the divided frequency signal with a reference frequency signal to provide an error signal, and a feedback path comprising a transfer function of 2-Z-1 and responsive to the error signal and the reference frequency signal to provide the division ratio control signal.
Copeland Miles Alexander
Riley Thomas Atkin Denning
Adams Thomas
Nortel Networks Limited
LandOfFree
Delta-sigma fractional-n frequency synthesizer and frequency... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Delta-sigma fractional-n frequency synthesizer and frequency..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Delta-sigma fractional-n frequency synthesizer and frequency... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1804070