High frequency broadband TV signal transformer, especially for 4

Wave transmission lines and networks – Coupling networks – With impedance matching

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336188, H03H 738

Patent

active

052163938

ABSTRACT:
Conventional transformers for coupling a transmission line to a laser diode have an upper frequency limit of about 600 MHz. In order to extend bandwidth up to 860 MHz, an improved transformer features a first winding W1 and a second winding W2 twisted together and wrapped through apertures L1 and L2 of a double-aperture ferrite core DK. The twisting together of the windings suppresses stray inductances which would otherwise limit bandwidth. Preferably, a first grounding C1 is connected to the input terminal E and a second grounding capacitor C2 is connected to the output terminal O. Further, at the output terminal O, a laser diode LD is connected. The improved structure will perform anywhere within a bandwidth from 47 MHz up through 860 MHz.

REFERENCES:
patent: 4201962 (1980-05-01), Hosoga
patent: 4379273 (1983-04-01), Bender
patent: 4687947 (1987-08-01), Cobb
patent: 5051710 (1991-09-01), Kaltenecker
John Watkinson, The Art of Digital Video, pp. 243-244, 328-330, Focal Press, Stoneham, Mass., 1990, ISBN 0-240-51287-1.
Peter Wandel, "Simplified Combination Laser Diode Protective Circuit," corresponding to DE-OS 40 31 066.3 (U.S. Ser. No. 07/766002 filed Sep. 26, 1991).

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