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Multi-Level Grey Scale Video Amplifier for Monochrome Displays

IP.com Disclosure Number: IPCOM000060134D
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Le, T: AUTHOR

Abstract

Fig. 1 illustrates a grey scale video amplifier with a built-in radio frequency (RF) digital-to-analog (D/A) converter. The RF transistor 10 is connected in common-base configuration with anti-saturation Baker- clamping diodes 11. R2 removes the storage charge from the base of 10 and also sets its bias through Rv. Currents I, 2I,..., 2nI are steered into the emitter 12 of transistor 10 through a series of Schottky inverters connected in current- open-collectors. The inputs of the inverters 15 are resynchronized using a "fast" D-type flip-flop 20 with a dot clock input 21. This circuit is fast and gives clean output waveforms. The arrangement is equivalent to a linear amplifier with a gain-bandwidth product of 3500 MHz.

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Multi-Level Grey Scale Video Amplifier for Monochrome Displays

Fig. 1 illustrates a grey scale video amplifier with a built-in radio frequency (RF) digital-to-analog (D/A) converter. The RF transistor 10 is connected in common- base configuration with anti-saturation Baker- clamping diodes 11. R2 removes the storage charge from the base of 10 and also sets its bias through Rv. Currents I, 2I,..., 2nI are steered into the emitter 12 of transistor 10 through a series of Schottky inverters connected in current- open-collectors. The inputs of the inverters 15 are resynchronized using a "fast" D-type flip-flop 20 with a dot clock input 21. This circuit is fast and gives clean output waveforms. The arrangement is equivalent to a linear amplifier with a gain-bandwidth product of 3500 MHz.

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