Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1991-09-30
1992-07-21
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307241, 307268, 307311, 307555, H03K 301, H03K 501
Patent
active
051325535
ABSTRACT:
An LED pulse shaping circuit is disclosed which is capable of providing improved rise time (using current peaking) and fall time (using charge extraction). The pulse shaping circuit consists of a conventional differential current switch coupled to a pair of switching elements and resistance elements. A first switching element is activated at the beginning of a pulse to provide for an initially increased drive current to the LED, the value of a first resistance element used to determined the level of the increased drive current. The current peaking thus results in decreasing the rise time of the LED. The remaining switching element and resistance are utilized, in conjunction with the differential current switch, to provide a reverse current flow through the LED at the end of the pulse. The charge extraction thus results in decreasing the fall time of the LED.
REFERENCES:
patent: 3770986 (1973-11-01), Drehle
patent: 3828206 (1974-08-01), Zuk
patent: 3976932 (1976-08-01), Collins
patent: 4166947 (1979-09-01), Dirksen
patent: 4198602 (1978-08-01), Nishijima et al.
patent: 4262320 (1981-04-01), Herron
patent: 4295226 (1981-10-01), Dombrowski
patent: 4496849 (1985-01-01), Kotowski
patent: 4585953 (1986-04-01), Gaudenzi et asl.
patent: 4636654 (1987-01-01), Lach
patent: 4795916 (1989-01-01), Liron
patent: 4939381 (1990-07-01), Shibata et al.
patent: 5028820 (1991-07-01), Sullivan
"High-Speed 1.3-.mu.m LED Transmitter . . . ", T. Suzuki et al., Journal of Lightwave Technology, vol. LT-4, No. 7, Jul. 1986 pp. 790-794.
AT&T Bell Laboratories
Cunningham Terry D.
Koba Wendy W.
Miller Stanley D.
LandOfFree
LED pulse shaping circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with LED pulse shaping circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and LED pulse shaping circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-845647