Circuit for coupling a signal processing device to a transmissio

Details Circuit for coupling a signal processing device to a transmissio Circuit for coupling a signal processing device to a transmissio

1985-05-29

1987-09-01

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307241, 333 32, H03K 1756, H03K 508, H03H 738

Patent

active

046911286

ABSTRACT:
A coupling circuit is disclosed having a series connection of a first transistor (2) and a controlled current source (3). A transmission line (17) is connected to the junction of the first transistor (2) and current source (3). A signal I/O terminal of a signal processing device (1), acting as both input and output, is connected via a first resistor (4) to the base of the first transistor (2). A control output S of the device (1), which presents a signal establishing the transmission direction, is connected via a second resistor (5) to the base of the first transistor (2). The transmission line (17) is connected via a third resistor (6) to the signal I/O terminal of the device (1). This coupling circuit can be used both for transmitting and for receiving signals, the impedance being low in the transmitting direction and high in the receiving direction. The coupling circuit requires only two connections to the signal-processing device, this being advantageous, in particular, when using large scale integrated circuits.

REFERENCES:
patent: 3585399 (1971-06-01), Andrews, Jr.
patent: 3656002 (1972-04-01), Gilson et al.
patent: 3700832 (1972-10-01), Beurrier
patent: 4535360 (1985-08-01), Briley et al.

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