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Abstract

A circuit for processing an analog signal having a time sequence of discrete signal levels, each of which lies in a time interval and represents an information-bearing segment of the interval while the rest of the time interval is a non-information-bearing segment, comprises a transistor (10) in emitter-follower or source-follower configuration, a high emitter or source resistance or, instead, a high-ohm constant current source (20), and a device (14) for applying a voltage supply, as well as a switch (24) which is connected between the emitter and a reference potential (26) to prevent a current from flowing via the high-ohm resistance or the high-ohm voltage source (20) for charge reversal of an output capacitance (22) of the circuit in one direction, whereas for charge reversal in the other direction the dynamic current boosting effect of the transistor (10) is exploited. This results in a fast emitter-follower or source-follower circuit which is particularly suitable as the output stage for image sensors.

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