首页>
外国专利>
Polarity inverter circuit for telecommunications line - feeds emitters of differential amplifier transistors from common polarity switching circuit
Polarity inverter circuit for telecommunications line - feeds emitters of differential amplifier transistors from common polarity switching circuit
展开▼
机译:电信线路的极性逆变器电路-从公共极性切换电路向差分放大器晶体管的发射极供电
展开▼
页面导航
摘要
著录项
相似文献
摘要
The invertor consists of a subscriber line circuit which contains two operational amplifiers and is controlled by the outputs of a differential amplifier. The emitters of the transistors in the differential amplifier are fed by a common polarity switching circuit; the input to the switching circuit being a logic level signal. The two differential amplifier inputs are supplied by circuits which divide the output of a voltage reference source. The reference source is also controlled by logic level signals. Current summing techniques used in the input circuit to one side of the differential amplifier ensure that temperature changes do not affect the accuracy of the inversion.
展开▼