Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1983-06-29
1985-08-27
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307443, 307528, 307529, 307269, 328 75, 328134, 328157, H03K 5135, H03K 526
Patent
active
045381100
ABSTRACT:
A clock signal regenerator comprising a frequency control loop (1, 2, 3, 4) which comprises a variable-frequency clock signal generator (2) used in digital telephone exchanges, when a local clock signal must be generated from incoming clock signals (1-1, 1-N). The clock signal regenerator comprises a very stable auxiliary signal generator (9) and a first difference signal producer (11) for determining the frequency difference between the generated clock signal and the auxiliary signal. This frequency difference is determined periodically and written into a storage device (13). In addition, the regenerator comprises a second difference signal producer (14) in which the difference is determined between a new frequency difference determined in the first difference signal producer (11) and the preceding frequency difference stored in the storage arrangement (13). After the incoming clock signals (1-1, . . . 1-N) have dropped out the difference signal produced in the second difference signal producer (14) is applied as a control signal to the clock signal generator (2), and the content of the storage device ( 13) is not changed. This has the advantage that the stability of the clock signal regenerator is then the same as the stability of the auxiliary signal generator.
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Hollaar Leendert J.
Verbeek Robert J. M.
Zoetman Herman
Briody Thomas A.
Hudspeth D. R.
Miller Stanley D.
Streeter William J.
U.S. Philips Corporation
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