Design of a voltage-to-current converting interface for current-mode video signal processing applications

Abstract

Voltage-to-current converters (VICs) are starting to be extensively used in video speed current-mode analog circuits, especially in A/D converters, as internal building blocks or external interfaces with voltage-mode signals. Despite the important role played by VIC's in video signal processing systems, until now no design examples nor experimental results on video rate VIC's have been reported. The purpose of this paper is to present the design of a newly developed VI converter, suitable for interfacing 8-b current-mode circuits operating at video frequencies with voltage signals. A test circuit has been fabricated in 0.7-/spl mu/m, 5-V single-supply CMOS digital process.