Static information storage and retrieval – Systems using particular element – Semiconductive
Patent
1978-10-24
1980-04-15
Fears, Terrell W.
Static information storage and retrieval
Systems using particular element
Semiconductive
365228, 307238, G11C 1140
Patent
active
041986962
ABSTRACT:
Use of a residual charge bleed-off diode connected to the gate of an FET device in a Read Only Storage (ROS) is disclosed. The ROS is personalized by cutting selected gate leads in an array of FETs with a laser beam. Experience has shown that static electric charges on the lead due to handling prior to cutting become isolated at the gate after the gate lead is cut, producing an unpredictable conduction state for the FET instead of a solid off-state as desired. By providing a bleed-off diode which remains connected to the FET gate after the cut is made, the charges are allowed to leak away from those FETs whose gates have been cut while, at the same time, preventing the voltage of the FET gate from floating. The diode is oriented so as to offer a high impedance to current flowing from the gate node when the gate is biased for FET conduction. This minimizes the effect of the diode on circuit speed when the gate remains connected with the balance of the read only storage circuitry. If the gate and diode have been selectively severed from the balance of the read only storage circuitry, in the course of programming the storage, any residual charge on the gate is conducted through the diode by virtue of its reverse bias leakage or forward biased conduction state, depending upon the polarity of the residual charge on the gate.
REFERENCES:
patent: 3777216 (1973-12-01), Armstrong
patent: 3967295 (1976-06-01), Stewart
IBM Tech. Dis. Bul. vol. 19, No. 4 Sep. 1976 "Monolithic IC Fuse Link" by Deliduka et al. p. 1161. _
IBM Tech. Dis. Bul. vol. 15, No. 8 Jan. 1973 "ROM Fabrication by Laser Fonmeo Connections" Cook et al. pp. 2371-2372. _
Bertin Claude L.
Bula John
Martin Larry C.
Williams Thomas A.
Fears Terrell W.
Hoel John E.
International Business Machines - Corporation
LandOfFree
Laser cut storage cell does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Laser cut storage cell, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laser cut storage cell will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-478652