| 摘要 |
A direct-coupled DC amplification circuit effects amplification over all the amplification stages using a ground potential as the reference voltage, and yet supplies a load with voltages in both positive and negative directions. In one preferred embodiment, a second or subsequent amplification stage including a phase compensating element has an amplification element in the form of cascode-connected complementary transistors connected to positive and negative power input terminals via first and second constant current circuits, respectively, and the set current of the first constant current circuit is set to be twice greater than that of the second constant current circuit. The disclosed arrangement enables to completely eliminate the influences of noise component superposed with the power source voltage, and to drastically improve the power source noise suppression ratio alone up to a high frequency range, independently of such dynamic characteristics of the amplification circuit as the slew rate, band width, operation speed and the like.
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