Subscriber's circuit

Abstract

Abstract PURPOSE:To produce a miniaturized light weight subscriber's circuit with high density by installing 3 amplitifers and plural resistors for preventing the round routing of signals. CONSTITUTION:DC corerentIis supplied to a subscriber's terminals SUB through transistors Q10, Q11 and resisters R10, R11. A signal from the subscriber's terminal SUB is applied to a differential amplifier OP10 through resisters R16, R17, which are considerably larger than the resisters R10, R11, and capactiros C10, C11 and an output from the differential amplifier OP10 is sent to a terminal TA. A signal outputted from the terminal TA is applied to a differential amplifier OP11 through resisters R22, R24, R25. An output from the amplifier OP11 is supplied to the transistor Q10 through a capacitor C12 and, simultaneously, applied to the transistor Q11 through an inversion amplifier OP12 and a capacitor C13 to send the signal to the subscriber's terminal SUB. Thus, the round routing of signals can be prevented by setting up the values of the resisters R18, R19 and R23, R24, R25, R26 appropriately.

Inventors

• 👤 Nobuyuki Miyahara

Bibliographic Details