| 摘要 |
PURPOSE:To prevent the deterioration in the AC characteristic and the production of an error by adopting a common emitter or common source connection to a complementary transistor (TR) to an emitter or source of a TR of common base or common gate connection so as to decrease number of components and reduce the power current. CONSTITUTION:Differential pair TRs 17, 18 driven by a current source 7 amplify the signal given from input terminals 3, 4 together with active loads 5, 6 and the amplified output is given to an emitter of a TR 10 and a base of a TR 11 via an emitter follower comprising a TR 8. A common base input resistance R1 is expressed in equation I, where alpha10 is a common base current amplification factor of the TR 10 and gm10 is the mutual conductance. Then equation II is established, where gm11 is the mutual conductance of a TR 11 itself and Gm is the overall mutual conductance of the resistor Ri and the TR 11. Then equation III is established, and equation V is given under the assumption of the establishment of equation IV, and the mutual conductance is a half the conventional circuit.
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