| 摘要 |
PURPOSE:To obtain the high-S/N amplifier which switches operation conditions of a differential amplifier. CONSTITUTION:The amplifier has a 1st input terminal e1 and a 2nd input terminal e2 and one output terminal eo, and the 1st input terminal e1 and output terminal eo are compared and detected by a 1st differential amplifier Ad1 for 1st comparison and detection and added through an in-phase feeding resist RD; and the other 2nd input terminal e2 and a 2nd differential amplifier Ad2 compensate loss by resistors R4' and R3' and addition to the input from the output terminal of the 1st differential amplifier Ad1 is performed through a resistor R1'; and an input circuit has no noise generation source due to a resistance, so the good-S/N amplifier is obtained. |
