Seiichi Ueda

An 8-b ADC with over-Nyquist input at 300-Ms/s conversion rate

An 8-b flash analog-digital (A/D) converter (ADC) LSI for high-speed data acquisition systems such as digital oscilloscopes and wave digitizers is described. This converter can convert analog input signals over the Nyquist frequency (up to 200 MHz) at a conversion rate of 300 megasamples per second (Ms/s) without glitch errors. In addition, it can be operated at up to 440 Ms/s when input frequency is as low as 100 kHz. This ADC is fabricated by a 2.5- mu m, 10-GHz f/sub T/, Si bipolar technology called the advanced sidewall base contact structure (advanced SICOS) technology. For high-performance glitch error suppression, an inhibitory circuit and a comparator design with an inner clock buffer are developed. Both techniques require few hardware additions. >

A 500-MHz 8-bit D/A converter

An ultrafast monolithic 8-bit DAC is designed and fabricated. To realize this DAC, a new high-speed conversion technique, referred to as the data multiplexing method, and a variation of the segmented DAC (J.A. Shoeff, 1979) for low glitch are developed. The DAC is fabricated with shallow-groove-isolated 3-/spl mu/m VLSI technology with peak f/SUB T/s of 4.5 GHz. An experimental 8-bit DAC features a conversion rate of over 500 MHz, a full-scale settling time to 1% of 2 ns, rise/fall times of 0.6 ns, and a glitch energy of 20 ps-V without input latches or a deglitcher.

A 300 MHz monolithic video current driver for high-resolution CRT applications

A current-mirror-driven cascade amplifier, which is an open-loop, wide-bandwidth integrated video amplifier for high-resolution color CRT displays, and its key driver IC are described. The IC, with a bandwidth of DC to 300 MHz and an output current of 300 mA, is successfully applied in a 40 V/sub p-p/ video amplifier for 2 Mpixel displays operating up to 150 MHz. This IC, fabricated in 3 mu m bipolar technology, has a high-current amplifier, a video gain controller, and a dual-input buffer with multiplexer. >

A 400-MHz DA converter with a 4-bit color map for 2000-line display

A monolithic ultra-high-speed bipolar 400-MHz video DAC with a color-map memory has been fabricated and operated successfully. The chip enables the use of 256-step color-map data by addressing with a 4-bit video input signal, in an extremely high-definition 2000×2000-pixel display.