Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Patent
1992-09-18
1995-01-24
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
331 10, 331 16, H03L 708, H03L 7107
Patent
active
053845501
ABSTRACT:
An apparatus and method for improving the capture performance of frequency and phase locked loops. The invention permits improved capture performance while, at the same time, maintaining the signal-to-noise ratio performance of the loop while the loop is tracking. The invention estimates the transient response of an automatic control loop. This estimate is used to control elements added to a PLL to accelerate acquisition, and eliminate the noise contribution of those added elements while the loop is tracking. The system uses the variation in the gradient of the loop transient response to derive an estimate of the loop's distance from lock. The system then uses this estimate to control loop parameters which affect the loop's acquisition.
REFERENCES:
patent: 3748590 (1973-07-01), Gray
patent: 3768030 (1973-10-01), Brown et al.
patent: 4007429 (1977-02-01), Cadalora et al.
patent: 4074207 (1978-02-01), Forsberg
patent: 4107624 (1978-08-01), Turner
patent: 4354277 (1982-10-01), Crackel et al.
patent: 4367444 (1983-01-01), Gardner et al.
patent: 4419759 (1983-12-01), Poklemba
patent: 4454604 (1984-06-01), Myers
patent: 4563767 (1986-01-01), Brandt
patent: 4614917 (1986-09-01), Zelitzki et al.
patent: 4745372 (1988-05-01), Miwa
patent: 4896336 (1990-01-01), Henely et al.
patent: 5208546 (1993-05-01), Nagaraj et al.
patent: 5220294 (1993-06-01), Ichikawa
patent: 5247265 (1993-09-01), Norimatsu
patent: 5276408 (1994-01-01), Norimatsu
A. Mileant and S. Hinedi, "Analysis of Lock Detection in Costas Loops", Jul. 1991, Technical Support Package for NASA Tech Brief, vol 15, No. 7, Item No. 86, JPL Invention Report, NPO-18102/7612 (no page #s).
Charles R. Cahn, "Improving Frequency Acquisition of a Costas Loop", Dec. 1977, IEEE Transactions on Communications, vol. Com-25, No. 12, pp. 1453-1459.
Henely Steven J.
Pool Robert H.
Hamann H. Fredrick
Mis David
Murrah M. Lee
Rockwell International Corporation
Williams Gregory G.
LandOfFree
Loop transient response estimator for improved acquisition perfo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Loop transient response estimator for improved acquisition perfo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Loop transient response estimator for improved acquisition perfo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1470313