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Logic element
| Details |
Inventors: Rathbone, Ronald; Rydval, Peter;
Assignee: Siemens Aktiengesellschaft (Berlin & Munich, DT)
Primary Examiner: Zazworsky; John
Assistant Examiner:
Attorney, Agent or Firm: Hill, Gross, Simpson, Van Santen, Steadman, Chiara & Simpson
A logic element, particularly a bipolar gate circuit for an LSI-circuit, employing a pair of Schottky-diodes, a pair of resistances and a transistor, with the diodes, connected in high resistance direction, to respective inputs, the other sides of the diodes being connected in common to a first resistance and to the base of the transistor, with said first resistance being operatively connected to a reference potential, said second resistance connecting the collector of the transistor, and the common connection of said diodes. |
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DETAILED DESCRIPTION It is the object of the invention to provide a gate circuit of the type above described which enables a favorable adjustability of the logic swing.
In accordance with the invention, this problem is solved by the utilization of a second resistance disposed between the collector of the transistor and the second terminal of the first and second Schottky-diodes.
By replacement of the third Schottky-diode in a S.
sup.
3 TL-gate circuit, with a second resistance, an improved adjustability of the logic swing is attained with the aid of the resistance ratio between the first and second resistance with respect to the supply voltage or the supply current.
In addition, variations influenced by temperature and production tolerance variation in manufacture may be compensated by means of adjusting the resistance ratio or by supply from a matching current source.
Advantageously, the second terminals of the first and second Schottky-diode are connected to the adjacent terminal of the first resistance over the collector-emitter path of a second transistor.
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Fault Detection 
