Geoffrey W. Perkins

A low cost, monolithic, color picture-in-picture device

A complete low cost, bus controlled, NTSC color picture-in-picture device using 0.8 /spl mu/m BiCMOS technology is described. A total system integration has been achieved that includes a field memory plus digital and analog video signal processing. >

A Multi-standard Geometry Correction Device For Flat Shadow Mask High Definition Displays

A circuit which integrates a set of basic geometry correction waveforms together suitable for flat shadow mask displays has been implemented. A sinewave generation technique which does not use frequency selective components is used. Horizontal and vertical frequencies may be independently changed by modifying two external circuits. Since all output waveforms track these frequency changes while retaining their shapes and amplitudes, this implementation is suitable for multimode operation. The proposed technique does not have the drawbacks of current methods of sinewave generation, which involve frequency selective components and do not lend themselves to multifrequency operation. >

Multimode high definition and personal computer monitor chip set

A new family of devices to simplify the design of multimode computer displays has been developed. This cost-effective and highly integrated system has been developed for personal computer and high-definition CRT displays. The range of signals with which the chip set can operate includes TTL (transistor transistor logic) and/or analog video, and composite or separate H and V TTL level sync. The horizontal timebase has frequency agility, enabling it to lock over a range of 15.5 kHz to 50 kHz automatically. The analog video bandwidth is in excess of 50 MHz. Four integrated circuits are included in the family: one is used exclusively for TTL-to-analog video conversion, the other three are variants of the timebase/video circuit. The main system functions are TTL-to-analog conversion, DC video contrast and brightness controls, video cascode drivers for video output stages, automatic sync source and polarity control, a vertical oscillator and ramp generator, a frequency agile horizontal timebase, and programmable drivers for horizontal frequency-dependent power MOSFET switching. >

A low cost, general purpose S-video, PAL/NTSC encoder

The device is used to encode red, green, and blue (RGB) color difference signals from a camera, computer graphics system, or some other originating generator into the established PAL or NTSC standards. In addition to the color composite video output, separate chrominance and luminance S-video signals are generated for improved display and video recording quality. All three outputs have 75- Omega drive capability and are available concurrently. The RGB inputs require 700 mV p-p for 100% color saturation and for 700 mV p-p at the 75- Omega video output loads. The device may be phase locked to an external 4.43-MHz or 3.58-MHz subcarrier source, driven from an external four times subcarrier frequency clock or free run from the internal four times subcarrier frequency crystal oscillator. The device was fabricated using a 2- mu m oxide isolated 4-GHz bipolar process, had 20 pins, and operated from a single 5-V supply. >