Shared current source for alpha particle insensitive bipolar lat

Details Shared current source for alpha particle insensitive bipolar lat Shared current source for alpha particle insensitive bipolar lat

1991-04-25

1992-07-28

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307289, 307455, 307467, H03K 3289, H03K 19086

Patent

active

051343126

ABSTRACT:
A bipolar ECL latch or flip-flop circuit of the isolated differential feedback type provides a high level of alpha particle immunity, without unduly affecting the propagation delay, power dissipation or circuit area in an integrated circuit device. A pair of latch transistors having differential input are used, with common emitters coupled to a clocked current source. The latch outputs are coupled back to a pair of holding transistors by two emitter follower feedback transistors. The holding transistors have a common emitter connection to a current source clocked inversely to that of the current source for the latch transistors, so the state of the latch is held by the holding transistors. The amplification of the feedback transistors is reduced so that the speed with which the transistor can react to transient noise such as that produced by an alpha hit is reduced. A shared current source is employed for the emitter follower feedback transistors to reduce the alpha particle sensitivity by lowering the feedback current without requiring two larger resistor values.

REFERENCES:
patent: 4777388 (1988-10-01), Widener
patent: 4779009 (1988-10-01), Tsunoi et al.
patent: 4825097 (1989-04-01), Bazil et al.
patent: 5001361 (1991-03-01), Tamamura et al.
Okabe et al., "Design for Reducing Alpha-Particle-Induced Soft Errors in ECL Logic Circuitry", Journal of Solid-State Circuits, Oct. 1989, pp. 1397-1403.

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