Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Patent
1997-03-27
2000-01-11
Tokar, Michael
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
326 21, H03K 1716
Patent
active
060140372
ABSTRACT:
Embodiments of the invention include a method and arrangement of integrated circuit components for enhancing the integrity of communication signals transmitted through a multi-device communication system. Embodiments of the invention provide controllable impedance arrangements for coupling to one or more integrated circuit components coupled along a bus transmission line within the communications system. The coupled impedance arrangements establish damping impedances for selected devices between the signal transmitting component and the signal receiving component along the bus transmission line to advantageously reduce distortion and ringing associated with the LC parasitic network behavior of the devices. Typically, a damping impedance is coupled to the integrated circuit component immediately adjacent to the signal transmitting component along the bus transmission line between the signal transmitting component and the signal receiving component. Alternatively, other integrated circuit components between the signal transmitting component and the signal receiving component have damping impedances coupled thereto in addition to or instead of the integrated circuit component adjacent to the signal transmitting component. According to an embodiment of the invention, the controllable damping impedance arrangements are on-chip and off-chip configurations of switchable impedance elements that when actuated couple the necessary impedance to the characteristic capacitance and associated inductance of selected integrated circuit components. The damping impedance arrangements are controlled by a controller operably coupled to the arrangement or by other suitable means. Implementation of the damping impedance arrangements advantageously improves the integrity of signals transmitted along the bus transmission line and reduces ringing without unnecessarily increasing power dissipation and/or driving power requirements of the signal transmitting components within the communications system.
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patent: 5596285 (1997-01-01), Marbot et al.
patent: 5686872 (1997-11-01), Fried et al.
patent: 5731711 (1998-03-01), Gabara
Gabara Thaddeus John
Rudnick Robert E.
Harman John M.
Le Don Phu
Lucent Technologies - Inc.
Tokar Michael
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