BI-CMOS tracking servo LSI for 8 mm VCR

A tracking servo LSI for an 8-mm VCR has been developed by utilizing 3- mu m high-speed bipolar CMOS technology. The chip contains analog functions, such as a low-noise amplifier, a gain-control amplifier, balanced demodulators, rectifiers, a precision Schmit amplifier and subtracter; mixed analog-digital functions, such as switched-capacitor filters, sample-and-hold amplifiers and analog switches; and digital functions, such as an oscillator, a clock generator, counters, and an externally selectable four-mode counter. High-performance mixed analog/digital performance is obtained by combined bipolar and CMOS devices. By integrating all necessary functions on one chip, no adjustment of the servo system is needed and low power capability has been realized. >