A 500-MHz CRT video driver using a linear array

A 500-MHz monolithic video driver integrated circuit (IC) for next-generation leading CRT (cathode ray tube) displays with 4 Mpixels or more is presented. The IC has a 320-mA output current amplifier, a video gain controller, a buffered input multiplexer, and a sample-and-hold bias circuit. Using new open-loop amplifier architecture and novel complementary-bipolar circuitry design, the driver IC with bandwidth f/sub B/ of 500 MHz is fabricated. It is economically implemented by a 2.5- mu m commercially available linear array with a transistor f/sub T/ of 4 GHz. Its f/sub B//f/sub T/ ratio (a figure of merit of the driver circuit design) is three times larger than that of the latest conventional design. The driver IC and power transistors are intended to realize a high-output (50.V/sub p-p/), wideband (300 MHz) CRT video amplifier characterized by good output voltage stability (<1%) without high-voltage output feedback for DC restoration.<
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