A monolithic video frequency filter using NIC-based gyrators
Hisatoshi Hagiwara, Masazumi Kumazawa, Shigetaka Takagi, Makoto Furihata, Minoru Nagatav, Takeshi Yanagisawa · Tokyo Tech Research Repository (Tokyo Institute of Technology) · 1987
In consumer electronic video products, one of the most important problems is to build filters in LSI system. The authors have presented an LC simulation synthesis of balanced-type active RC filters using NIC-based gyrators [1]. Since the proposed method have required only npn transistors with better frequency characteristics than those of pnp transistors, excellent frequency responses can have been obtained even at video frequencies. Therefore, the filters are suitable for video signal processing and can be easily implemented by a consumer electronic bipolar process. However, time constants of the circuits depend on device technology, and it is difficult to determine cutoff or center frequencies of the filters precisely.