Active solid-state devices (e.g. – transistors – solid-state diode – Integrated circuit structure with electrically isolated... – Passive components in ics
Reexamination Certificate
2001-05-22
2002-12-10
Flynn, Nathan J. (Department: 2826)
Active solid-state devices (e.g., transistors, solid-state diode
Integrated circuit structure with electrically isolated...
Passive components in ics
C257S467000, C257S469000, C341S119000, C341S154000, C338S007000, C338S009000, C338S013000
Reexamination Certificate
active
06492709
ABSTRACT:
TECHNICAL FIELD
The invention relates generally to resistors and more specifically to an arrangement for compensating for temperature dependent variations and process variations in surface resistance of resistors on a chip.
BACKGROUND OF THE INVENTION
When filters are produced on silicon chips, there are a number of factors that influence the transfer function of the filters. Since it is the RC-constant that sets the cut-off frequency of a filter, one can look at what causes the R, i.e. the resistance, and the C, i.e. the capacitance, to change.
The surface resistance of a resistor varies with temperature. Moreover, the surface resistance can vary in response to variations in the production process. The width of the resistor on the chip can e.g. vary.
In total, the resistance value can vary more than ±50%.
The capacitance value varies merely marginally and does not need compensation in the same extent.
SUMMARY OF THE INVENTION
The object of the invention is to provide an arrangement for compensating for such temperature dependent variations and process variations in surface resistance of a resistor on a chip.
This is attained in accordance with the invention by automatically connecting one or more compensating resistors in series with a main resistor.
REFERENCES:
patent: 3715609 (1973-02-01), Hallen
patent: 4229753 (1980-10-01), Bergeron et al.
patent: 4464646 (1984-08-01), Burger et al.
patent: 4591743 (1986-05-01), Kung
patent: 4622476 (1986-11-01), Venkatesh
patent: 4633230 (1986-12-01), Tam
patent: 4647906 (1987-03-01), Naylor et al.
patent: 4829571 (1989-05-01), Kakiuchi et al.
patent: 5721487 (1998-02-01), Milosevic
patent: 826984 (1998-03-01), None
Flynn Nathan J.
Nixon & Vanderhye P.C.
Sefer Ahmed N.
Telefonaktiebolaget LM Ericsson (publ)
LandOfFree
Arrangement for compensating for temperature dependent... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Arrangement for compensating for temperature dependent..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Arrangement for compensating for temperature dependent... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2957552