| 摘要 |
PURPOSE:To obtain an inversional amplifier in which the gain is extensively enlarged, by forming the amplifier by using three enhancement type FETs and three depression type FETs. CONSTITUTION:When the electric potential at a connecting point 5 rises, an action which increases the electric current of an FETD2 and another action which decreases the electric current simultaneously take place and the FETD2 supplies a constant electric current to another FETE2 irrespectively of the electric potential at the connecting point 5. When the electric potential at an input terminal 2 drops and the electric potential at an output terminal 3 rises under this condition, an action which decreases the drain current of an FETD1 and another action which increases the drain current simultaneously take place. As a result, the electric current flowing to the FETD1 becomes almost constant and the FETD1 becomes a load having a very high resistance component. Therefore, an inversional amplifier in which the gain is extensively enlarged can be obtained. |
