Gerald K Lunn

A multisystems on screen display for TV MCU

A novel on-screen display system for TV incorporated into an application-specific MCU (microprocessor control unit) is described. It uses the PLL (phase-locked loop) technique and is compatible with all currently known scanning standards which are detected automatically. The circuit is developed so that the characters are stable regardless of system change. Special techniques are used to minimize the horizontal jitter of the display. >

A Monolithic Wideband Synchronous Video Detector for Color TV

This paper describes a low-level detector intended primarily for video IF detection in TV sets and designed specifically for integrated circuit fabrication. The device is a detector for amplitude modulated signals with up to 100% modulation, giving a low distortion high level, wideband output for small input signals. The detection is full-wave synchronous, or doubly-balanced, giving rejection of carrier components in the input signal. When used as a TV video IF detector, where the carrier frequency is in the 40-50 MHz range, the unwanted products of detection are high enough in frequency to be lost in the internal capacitance of the device, with the output comprising only the wanted video signal. A built-in suppression of chroma-sound intercarrier beat greatly eases the sound trapping requirements. The principle behind the device is not new, but the integrated circuit structure used is novel and has many advantages over a discrete approach.

Monomax-An Approach to the One-Chip TV

Monochrome TV receivers, like portable AM radios, have remained impenetrable to the skills of the linear IC designer - mainly because of very stringent cost requirements and relatively low demands on performance. There is, however, a market demand for a more sophisticated breed of receiver for portable use which is relatively complex when built with discrete components.