Semiconductor memory device

Details Semiconductor memory device Semiconductor memory device

1989-10-16

1991-05-14

James, Andrew J.

Static information storage and retrieval

Magnetic bubbles

Guide structure

357 31, 357 32, 357 34, 365 34, H01L 2972, H01L 2714, H01L 3100, H01L 3114

Patent

active

050160753

ABSTRACT:
A semiconductor memory device is constructed of a lateral bipolar transistor as a load element. The base region of the lateral bipolar transistor has an impurity concentration which is increased from the upper surface of the base region in the depth direction of the base region.

REFERENCES:
patent: 4056810 (1977-11-01), Hart et al.
patent: 4152627 (1979-05-01), Priel et al.
patent: 4257059 (1981-03-01), Herndon
patent: 4320410 (1982-03-01), Nishizawa
patent: 4580244 (1986-04-01), Birrittella
patent: 4589096 (1986-05-01), Kaneko et al.
patent: 4667218 (1987-05-01), Takahashi
patent: 4826780 (1989-05-01), Takemoto et al.
patent: 4914629 (1990-04-01), Blake et al.
Bhattacharyya et al., "Dual Base Lateral Bipolar Transistor", Sept. 1977 of IBM, 357 *35.

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