IDEAL CURRENT SOURCE

An ideal current source produces a given amount of current is no matter what load it sees. As shown in Fig. 1.9, a commonly used symbol for such a device is circle with an arrow indicating the direction of current flow. While a battery is a good approximation to an ideal voltage source, there is nothing quite so familiar that approximates an ideal current source. Some transistor circuits come close to this ideal and are often modeled with idealized current sources.