| 摘要 |
PURPOSE: To improve the transient characteristics and inverse destroy voltage of an input stage by providing a differential transistor amplifier, error detecting means and correction circuit, converting a correction voltage to a correction current and adding it with the output current of a main differential amplifier stage. CONSTITUTION: An error voltage dV is settled at a base/emitter voltage Vbe of input transistors 46-60. The same error as this error is generated in a collector/emitter voltage Vce of detection transistors 52-50. Therefore, assuming that a signal source resistors 44-62 are ignored and theβof transistors is infinitely large, concerning a main differential output current dI of a main differential amplifier, the voltage to be impressed to a correction amplifier is only the dV. This voltage is fine and the correspondent error voltage of this stage is low and can be ignored. Therefore, the correct representative value of an error voltage between paired input transistors is impressed to the correction amplifier. When regulation resistors 50-56 are suitably selected as primary approximation, the gain fluctuation factors of these resistors can be completely excluded.
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