Transmitter and receiver circuit

Details Transmitter and receiver circuit Transmitter and receiver circuit

1987-01-27

1988-04-05

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

178 63R, 375 36, 375104, H04L 2508, H04B 350

Patent

active

047363851

ABSTRACT:
High frequency transmitter and receiver circuits are AC coupled for party line transmission over coaxial cable where the circuits are connectable to the cable by use of stinger taps and thereby eliminate the need to interrupt service when connecting the circuits to the cable. The transmitter circuit includes oppositely polled current sources which are alternately switched to the coaxial cable via the stinger tap or to a dummy load by current switches connected to data inputs via buffer circuits. A transmit enable circuit controls the current sources to be active or inactive and to prevent unbalances from saturating either current sources. The receiver includes a high input impedance biasing network and buffer amplifier that maintain the high input impedance even when power is off. Capacitance at the tap is reduced by a capacitor drive circuit which feeds input signal back to transmitter blocking diodes and to the trunk tap. A feed ahead network, differentiating network, and another buffer amplifier form a network for recovering the transmitted signal shape regardless of distance from the transmitter. A gated amplifier restores the shaped signal to logic levels ready for conversion to non-return-to-zero data. Filter and buffer circuits restrict level detection to signals in the frequency band of the transmitter. A threshold circuit sets the carrier sense detection level and a high gain amplifier converts signals above the threshold to ECL logic levels. After conversion of the ECL logic levels to TTL logic signals, a single shot produces a DC level from the logic level carrier signal. That DC carrier sense output enables data conversion circuits and drives a gate circuit for gating the gated amplifier.

REFERENCES:
patent: 3613012 (1971-10-01), Feistel
patent: 3671671 (1972-06-01), Watanabe
patent: 4086534 (1978-04-01), Olson
patent: 4425663 (1984-01-01), Lam
patent: 4434497 (1984-02-01), Rolfe

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