| 摘要 |
The present invention is a differential amplifier with circuitry to eliminate the effect of transistor impedance other than an actual load impedance on voltage gain. The circuitry includes a pair of transistors 400 and 402, each with a base connected to a respective input of the differential amplifier along with a similar base connection of a respective one of transistors 100 and 102, and an emitter connected to a current source 404. A collector of transistor 400 is connected through transistor 410 to the emitter of a current sink transistor 306, while the collector of transistor 402 is connected through transistor 412 to the emitter of a current sink transistor 308. Operational amplifiers (opamps) 420 and 422 serve as voltage followers to connect the collector of transistor 100 to the base of transistor 412, and the collector of transistor 102 to the base of transistor 410. An inverting input of the opamps 420 and 422 are connected to the emitter of transistors 410 and 412 to eliminate the effect of a emitter to base voltage drop in transistors 410 and 412. With such components, loading at the outputs VOUT and VOUTB is substantially limited to the actual load provided by transistors 306 and 308 and resistors 316 and 318.
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