Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Regenerating or restoring rectangular or pulse waveform
Patent
1996-02-22
1997-11-11
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Regenerating or restoring rectangular or pulse waveform
327147, 327156, 327162, 33 11, H03L 7087
Patent
active
056868499
ABSTRACT:
The circuit for clock signal extraction from a high speed data stream which allows a rapid attainment of the identity between the frequencies of the locally generated clock signal and of the data signal, even when such frequencies are very different. The circuit can easily be inserted into a more complex CMOS digital integrated circuit, it has low power dissipation and is capable of operating at bit rates exceeding 300 Mbit/s. The circuit has a main phase locked loop, which controls a voltage controlled oscillator by continually controlling its phase and a secondary loop, which allows the main loop to become locked, by causing the voltage controlled oscillator to oscillate at a frequency close to the operating frequency.
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patent: 5015970 (1991-05-01), Williams et al.
patent: 5157355 (1992-10-01), Shikakura et al.
patent: 5525935 (1996-06-01), Joo et al.
Callahan Timothy P.
Cselt Centro Studi e Laboratori Telecomunicazioni S.p.A.
Dubno Herbert
Lam T.
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