Some Digitally Controlled Devices for Adaptive Control

In adaptive control systems the controller parameters are to be adjusted in real time in accordance with the information received from the measurements on system dynamics. A special purpose or general purpose digital computer is often necessary for generating the signals for controller parameter adjustments. In this paper we describe a few electronic devices whose parameters are directly under the control of digital signals. These devices will be of great use for many applications including adaptive control. The devices described in this paper are, digitally controlled variable gain amplifier, digitally controlled compensating network and digitally controlled variable frequency sampler.