Electronic digital logic circuitry – Interface – Current driving
Reexamination Certificate
2006-10-17
2006-10-17
Chang, Daniel D. (Department: 2819)
Electronic digital logic circuitry
Interface
Current driving
C326S030000, C327S012000
Reexamination Certificate
active
07123055
ABSTRACT:
Impedance-matched output driver circuits include a first totem pole driver stage and a second totem pole driver stage. The first totem pole driver stage includes at least one PMOS pull-up transistor and at least one NMOS pull-down transistor therein responsive to a first pull-up signal and a first pull-down signal, respectively. The second totem pole driver stage has at least one NMOS pull-up transistor and at least one PMOS pull-down transistor therein responsive to a second pull-up signal and second pull-down signal, respectively. The linearity of the output driver circuit is enhanced by including a first resistive element that extends between the first and second totem pole driver stages. The first resistive element has a first terminal, which is electrically coupled to drain terminals of the at least one PMOS pull-up transistor and the at least one NMOS pull-down transistor in the first totem pole driver stage, and a second terminal, which is electrically coupled to source terminals of the at least one NMOS pull-up transistor and the at least one PMOS pull-down transistor in the second totem pole driver stage.
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Fan et al., “On-Die Termination Resistors with Analog Impedance Control for Standard CMOS Technology,” IEEE Journal of Solid-State Circuits, vol. 38, No. 2, Feb. 2003.
Butka Brian K.
Chong Yew-Keong
Klein David J.
Chang Daniel D.
Integrated Device Technology Inc.
Myers Bigel & Sibley & Sajovec
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