Two-wire loop electric circuit arrangement

Details Two-wire loop electric circuit arrangement Two-wire loop electric circuit arrangement

1989-01-25

1991-11-12

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34087039, 340310A, H04Q 900

Patent

active

050651528

ABSTRACT:
The circuit includes a loop (3) in which a signal current flows; a supply voltage generation circuit (1); a signal conversion circuit (2); a switch (5) operative to connect either the supply voltage generation circuit or the signal conversion circuit into the loop (3) at any instant, the outputs of the supply voltage generation circuit and the signal conversion circuit being supplied to a common load (4) which controls operation of the switch (5); and a pair of capacitors (6,7) connected across the outputs of the supply voltage generation circuit and the signal current conversion circuit, respectively.

REFERENCES:
patent: 4520488 (1985-05-01), Houvig et al.
patent: 4603318 (1986-07-01), Philp
patent: 4623871 (1986-11-01), Akano
patent: 4831375 (1989-05-01), Kajiura
patent: 4926158 (1990-05-01), Zeigler
Bob Stevens, Signal Transmissions Put on a Pedestal, Control and Instruments, Sep. 1976, pp. 28 and 29.

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