Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1989-12-14
1990-12-04
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 17, 331 27, 307514, 328133, 375120, H03L 7085, H04L 7033
Patent
active
049756605
ABSTRACT:
The invention relates to automatic phase adjustment in a phase locked loop including an oscillator (Os) with a controllable frequency. The oscillator generates a timing signal which is used together with a received data signal (1) to form two pulse trains (9,10) which comprise pulses of a duration which in the first pulse train (9) is independent of, and in the second pulse train (10) is responsive to, the phase position of the timing signal relative the phase position of the data signal. The pulse trains are utilized to form a control signal to the oscillator (Os). In forming the pulse trains (9,10) there is utilized a first array of signals (6-8) which are formed by the data signal (1) being sampled in several different phase positions with the aid of mutually phase shifted clock signals (2-4). A rapid locking-in of the phase locked loop is obtained in accordance with the following. The signals in the first array are sampled simultaneously with the aid of a common clock signal (11), whereby a second array of signals (12-14 ) is formed. The signals (12-14) in the second array are compared with each other and an error signal (15,16) is formed if there is deviation. The error signal is used to amplify the control signal to the oscillator (Os).
REFERENCES:
patent: 4380815 (1983-04-01), Clendening
patent: 4535459 (1985-08-01), Hogge, Jr.
Grimm Siegfried H.
Telefonaktiebolaget L M Ericsson
LandOfFree
Method and apparatus for automatic phase adjustment in a phase l does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for automatic phase adjustment in a phase l, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for automatic phase adjustment in a phase l will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-885249