Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Fusible link or intentional destruct circuit
Patent
1993-08-09
1995-02-28
Hudspeth, David R.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Fusible link or intentional destruct circuit
338195, 257537, 327524, 327564, H02H 720, H03K 326
Patent
active
053940199
ABSTRACT:
A resistor ladder (10) includes a plurality of series resistors (16,18,20,22,24,26,28) connected in series with each other between a first terminal (12) and a second terminal (14). A plurality of shunt resistors (60,62,64,66, 68,70) are connected between junctions (48,50,52,54,56) of adjacent series resistors and the second terminal (14). The series resistors (16,18,20,22,24,26,28) and shunt resistors (60,62,64,66,68,70) are formed on a substrate (80) as film resistors which blow open at a predetermined current density. The shunt resistors (60,62,64,66,68,70) have a smaller cross-sectional area than the series resistors (16,18,20,22,24,26,28) such that they successively blow open from the first terminal (12) toward the second terminal (14), while the series resistors (16,18,20,22,24,26,28) do not blow open, as a progressively increasing voltage is applied between the first terminal (12) and the second terminal (14). The resistance of the ladder (10) increases as the shunt resistors (60,62,64,66,68,70) are successively blown. The shunt resistors (60,62,64,66,68,70) preferably have twice the resistance as the series resistors (16,18, 20,22,24,26,28), enabling the resistance of the ladder (10) to be electrically trimmed in increments equal to the resistance of each series resistor (16,18,20,22,24,26,28).
REFERENCES:
patent: 3930304 (1976-01-01), Keller
patent: 4150366 (1979-04-01), Price
patent: 4225878 (1980-09-01), Dobkin
patent: 4766366 (1988-08-01), Davis
patent: 4870472 (1989-09-01), Vyne
patent: 5065221 (1991-11-01), Imamura
patent: 5070383 (1991-12-01), Sinar et al.
patent: 5243319 (1993-09-01), Brokaw
Licari et al., Hydrid Microcircuit Technology Handbook, Noyes Publications, 1988, pp. 132-148.
Analog Devices Inc.
Hudspeth David R.
Roseen Richard
LandOfFree
Electrically trimmable resistor ladder does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electrically trimmable resistor ladder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrically trimmable resistor ladder will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-850259