| 摘要 |
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.
|
