Hysteresis Comparators with Current Conveyors

journal article - other

English

Circuits for analog signal processing that use elements working in the current mode have recently found increasing application. The current conveyor (CC) was defined as early as 1968. As a component, this element has not been much of a success in industrial practice. Some of the components manufactured can be employed as current conveyors, usually implemented as experimental connections. Current conveyors are used as function blocks in a number of integrated circuits for analog technology. It is therefore meaningful to be concerned with new connections and examine their properties. The present paper deals with hysteresis comparators with a CCII+ current conveyor, which forms part of the AD844 transimpedance amplifier. The comparator is basically a pulse circuit. In these circuits, the maximum rate of change in the output voltage is required during switching from one state to another. In com-parators with operational amplifiers the switching time is given by the slew rate of the operational amplifier used, which is not too high. If a current con-veyor is used, the time of switching the comparator should get shorter. The comparator will be capable of operating at a higher frequency and if it is used, for example, in converters, a higher operating frequency can be reached. The connection of an inverting and a non-inverting comparator with adjustable hys-teresis is shown as a practical implementation. Experimental measurements have confirmed the theoretical assumptions and the results of computer simulation.

current conveyor, comparator

Jiri Misurec

2006

1. 6. 2006

1738-9682

International Transactions on Communication and Signal Processing

2006

7

Republic of Korea

19

29

11