| 摘要 |
The output stage of amplifier according to invention relates to the field of radio engineering and telecommunications and can be used in development of circuits of microelectronics for different purposes. The aim of invention is to increase the dynamic range of output voltage up to values near to bus voltage source of negative voltage polarity. The output stage of amplifier contains voltage bias circuit (1), the first output of which is connected to input of amplifier (2), the first emitter follower (3), built-up on the first transistor (4), the second emitter follower (5), built-up on the second transistor (6), wherein the networks of the first (4) and the second (6) transistors are connected to output of amplifier (7), but collector of the second (6) transistor is connected to the first bus (8) of output stage of amplifier and to resistor (9) connected to emitter of power source on the third (10) transistor, collector of which is connected to the second input of voltage bias circuit (1). In order to achieve the aim of invention the operational amplifier is provided with differential stage (11) built-up on the fourth (12) and fifth transistor (15), the first (14) and the second (15) power sources, circuit of voltage level shift (16), circuit of diode shift (17), diode-switched transistor (18) and the sixth (19) transistor, wherein the third input of circuit of voltage level shift (16) is connected to the second bus (20) of output stage of amplifier.
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