High-stability clock signal regenerator

Details High-stability clock signal regenerator High-stability clock signal regenerator

H - Electricity

03

L

331/35, 331/58

H03L 7/00 (2006.01) G04G 5/00 (2006.01) G04G 7/00 (2006.01) H03K 5/26 (2006.01)

Patent

CA 1193676

11 ABSTRACT: "High-stability clock signal regenerator". A clock signal regenerator comprising a frequen- cy control loop (1, 2, 3, 4) which comprises a variable- frequency clock signal generator (2) is inter alia 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 diffe- rence between the generated clock signal and the auxiliary signal. This frequency difference is determined periodical- ly and written into a storage device (13). In addition, the regenerator comprises a second difference signal pro- ducer (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), the content of the storage device (13) not being 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.

431560

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