Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Reexamination Certificate
2005-11-15
2005-11-15
Lam, Tuan T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
C327S060000, C327S062000
Reexamination Certificate
active
06965257
ABSTRACT:
A level discrimination circuit includes two offset compensation circuits. Each offset compensation circuit receives a differential pair of input signals, detects their peak values, and adds the peak value of each input signal to the other input signal, thereby generating an offset-compensated differential pair of output signals. The output signals of the first offset compensation circuit are used directly as the input signals of the second offset compensation circuit. The output signals of the second offset compensation circuit therefore have the correct duty cycle, and can be correctly discriminated by a comparator, even if the input signals to the first offset compensation circuit are burst signals in which each burst includes a large direct-current bias. This level discrimination circuit is suitable for receiving optical signals transmitted in bursts.
REFERENCES:
patent: 5892609 (1999-04-01), Saruwatari
patent: 6018407 (2000-01-01), Hatakeyama et al.
patent: 6151150 (2000-11-01), Kikuchi
patent: 6215335 (2001-04-01), Rabii
patent: 6671075 (2003-12-01), Mizunaga
patent: 08-293838 (1996-11-01), None
patent: 9312528 (1997-12-01), None
patent: 10-84231 (1998-03-01), None
Lam Tuan T.
Nguyen Hiep
Oki Electric Industry Co. Ltd.
Rabin & Berdo P.C.
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