| 摘要 |
An NPN output stage for an integrated circuit amplifier includes a first NPN transistor (10) which sinks a first current from the output of said circuit when the first transistor is turned on by a varying input signal. A second transistor (4) is coupled to the output of the circuit and supplies a second current to the output when the first transistor turns off. A resistor (8) is coupled between the collector of the first transistor (10) and the emitter of the second transistor (4) to provide a voltage drop thereacross proportional to the amount of current being sunk by the first transistor so as to control the voltage at the base of the second transistor. In this way, the second transistor is turned on and off as the first transistor is turned off and on respectively. Diode means (6) provide a voltage level shift between the resistor (8) and the base of the second transistor (4). |
