Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2006-06-06
2006-06-06
Mai, Lam T. (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S154000
Reexamination Certificate
active
07057545
ABSTRACT:
A semiconductor resistor circuit having a controllable resistance associated therewith includes a plurality of resistor segments connected in a series and/or parallel configuration. The resistor circuit further includes a plurality of switches controlling connection of respective ones of the resistor segments to the resistor circuit, to thereby selectively control a resistance of the resistor circuit in response to respective control signals presented to the switches. The resistor circuit is selectively controllable in discrete resistance intervals, the resistance intervals being unequal to one another. The resistor segments have resistance values that are selected such that a percentage resistance variation across each of the respective resistance intervals as a function of process, voltage and/or temperature conditions to which the resistor circuit is subjected is substantially the same.
REFERENCES:
patent: 6788042 (2004-09-01), Nazarian et al.
patent: 6894550 (2005-05-01), Trosa et al.
Bhattacharya Dipankar
Kothandaraman Makeshwar
Kriz John C.
Morris Bernard L.
Agere Systems Inc.
Mai Lam T.
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