Current switching type logic circuit

Details Current switching type logic circuit Current switching type logic circuit

1985-07-29

1987-08-11

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307310, 307362, 307443, H03K 19003, H03K 19086

Patent

active

046863958

ABSTRACT:
A current switching type logic circuit is configured as a current switching circuit comprising a differential amplifier circuit and a constant current source. The differential amplifier circuit comprises a pair of transistors of which emitters are commonly connected to the constant current source. The current switching circuit is provided with two load resistors connected to the collectors of the transistors and two shunt circuits connected in parallel with the two load resistors, respectively, each shunt circuit comprising a diode and a resistor. In response to an input signal and a reference voltage applied to the bases of the transistors constituting the differential amplifier circuit, the current switching circuit effects a switching operation to produce a logic voltage as a voltage appearing across the load resistor. By setting the resistance of the shunt resistor at a suitable value, an adjustment of temperature characteristic of an anode-cathode voltage of the diode provided in the shunt circuit is made, thereby enabling the logic voltage to have a desired temperature characteristic. Usually, the logic circuit further comprises a level shift circuit of emitter follower type. Accordingly, such an adjustment of the resistance value of the shunt resistor also makes it possible that the output low level voltage produced from the level shift circuit has different temperature characteristics.

REFERENCES:
patent: 3569746 (1971-03-01), Lacour
patent: 3622799 (1971-11-01), Marley et al.
patent: 3649844 (1972-03-01), Kroos
The ECL Handbook Section Selector, 1974, Jul., P2-7, FIG. 2-9.

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