Allan J. Johnson
Engineering at Strawberry Ln, Orono, MN
License number
Louisiana PE.0016386
Issued Date
Jul 27, 1977
Expiration Date
Sep 30, 2010
Category
Civil Engineer
Type
Mechanical Engineer
Address
Address
5865 Strawberry Ln, Orono, MN 55331
Professional information
Fast Synchronization Circuit For Phase Locked Looped Decoder
US Patent:
4215430, Jul 29, 1980
Filed:
Sep 26, 1978
Appl. No.:
5/945990
Inventors:
Allan L. Johnson - Wayzata MN
Assignee:
Control Data Corporation - Minneapolis MN
International Classification:
H04L 704, H03D 324
US Classification:
375111
Abstract:
A phase detector in a phase locked loop decoder includes a reactive circuit adapted to vary a clock frequency responsive to a signal representing the phase error between a clocking signal and an incoming data signal, to maintain synchronization of the clocking and data signals. A fast synchronization circuit of the phase detector is adapted to generate a clock-frequency-altering signal whenever selected inputs derived from the data and clocking signals occur simultaneously, thereby rapidly forcing the clocking signal toward synchronization with the data signal.