Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Pulse multiplication or division
Patent
1992-12-10
1994-04-19
Wambach, Margaret R.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Pulse multiplication or division
H03K 2354
Patent
active
053053621
ABSTRACT:
A system for reducing structure spurs in multiple modulator fractional-N dividers caused by certain fractional divisors inducing an insufficiently random modulation pattern. The system sums with a first summer a fractional divisor value with an addend that changes periodically. Offset of the fractional divisor value caused by the summed addends is compensated by first subtracting the offset from the fractional divisor value with a second summer. Underflow or overflow of the fractional divisor value is accommodated by incrementing or decrementing an integer divisor value with a third summer connected in series with an integer divisor input of the multiple modulator divider.
REFERENCES:
patent: 3928813 (1975-12-01), Kingsford-Smith
patent: 4204174 (1980-05-01), King
patent: 4545072 (1985-10-01), Skutta et al.
patent: 4609881 (1986-09-01), Wells
patent: 4694475 (1987-09-01), Mehrgardt
patent: 4758802 (1988-07-01), Jackson
patent: 4800342 (1989-01-01), Jackson
patent: 4816774 (1989-03-01), Martin
patent: 4918403 (1990-04-01), Martin
patent: 4933890 (1990-06-01), Nuytkens et al.
patent: 4951237 (1990-09-01), Essenwanger
patent: 5021754 (1991-06-01), Shepherd et al.
patent: 5038117 (1991-08-01), Miller
patent: 5128633 (1992-07-01), Martin et al.
Mathew et al., "A Review of Sigma-Delta Modulation Structures," IEEE Colloquium on `Advanced A/D and D/A Conversion Techniques and Applications,` Digest No. 72, May 8, 1989, pp. 4/1-8.
Chou, et al., "Multistage Sigma-Delta Modulation," IEEE Transactions on Information Theory, vol. 35, No. 4, Jul. 1989, pp. 784-796.
Lewis et al., "Simulation and Modelling of Non-Linear Sampled-Data and Discrete Control Systems," IFAC Simulation of Control Systems, 1986, pp. 173-178.
Stikvoort, "Some Remarks on the Stability and Performance of the Noise Shaper or Sigma-Delta Modulator," IEEE Transactions on Communications, vol. 36, No. 10, Oct. 1988, pp. 1157-1162.
Nicholas et al., "An Analysis of the Output Spectrum of Direct Digital Frequency Synthesizers in the Presence of Phase-Accumulator Truncation," IEEE, 41st Annual Frequency Control Symposium, 1987, pp. 495-502.
Wheatley et al., "Spurious Suppression in Direct Digital Synthesizers," Proc. 35th Ann. Freq. Control Symposium, USAERADCOM, May, 1981, pp. 428-435.
Bjerede et al., "An Efficient Hardware Implementation For High Resolution Frequency Synthesis," Proc. 30th Ann. Symposium on Freq. Control, Jun. 1976, pp. 318-321.
Hewlett--Packard Company
Wambach Margaret R.
LandOfFree
Spur reduction for multiple modulator based synthesis does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spur reduction for multiple modulator based synthesis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spur reduction for multiple modulator based synthesis will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-26439