Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Reexamination Certificate
2011-03-08
2011-03-08
Tran, Anh Q (Department: 2819)
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
C326S032000, C326S034000, C326S087000
Reexamination Certificate
active
07902859
ABSTRACT:
Circuitry including an output circuit having a first variable resistance block coupled between a first supply voltage and an output node, the first variable resistance block having a plurality of selectable resistive elements coupled in series with at least one resistor between the first supply voltage and the output node, the output circuit having an output impedance determined by the resistance of the first variable resistance block; and a compensation circuit for regulating the impedance of the first variable resistance block of the output circuit, the compensation circuit having a second variable resistance block coupled between the first supply voltage and the first node of an external resistor, the second node of the external resistor being coupled to a second supply voltage, wherein the second variable resistance block comprises a plurality of selectable resistive elements coupled in series with at least one resistor between the first supply voltage and the first node of the external resistor, and wherein the plurality of selectable resistive elements of the first and second variable resistance blocks are selected based on a voltage level at the first node of the external resistor.
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French Search Report, dated Oct. 9, 2009, from French Application No. 08/57026.
Garcia Laurent Jean
Ricard Nicolas
Jorgenson Lisa K.
Morris James H.
STMicroelectronics S.A.
Tran Anh Q
Wolf Greenfield & Sacks P.C.
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