Electronic digital logic circuitry – Interface – Current driving
Reexamination Certificate
2005-02-15
2005-02-15
Le, Don (Department: 2819)
Electronic digital logic circuitry
Interface
Current driving
C326S083000, C326S030000
Reexamination Certificate
active
06856169
ABSTRACT:
Receiving units with inputs that may be ground-terminated and with inputs that are selectively ground-terminated or non-ground terminated are enabled with signal level shifting and a termination mode selection input. In a first exemplary implementation, a receiving unit is capable of having ground-terminated inputs. However, common mode voltage of the signal that is input to decoding data recovery circuitry is above ground because the input signal may be level shifted in between the ground-terminated inputs and the decoding data recovery circuitry. In a second exemplary implementation, a mode selection is accomplished by switching a voltage divider into operation and bypassing a level shifter for a non-ground terminated mode. For a ground terminated mode, the voltage divider is switched out of operation and the level shifter is switched into operation for its signal output to be decoded. Pre-amplification may also be employed to improve signal strength.
REFERENCES:
patent: 4513427 (1985-04-01), Borriello et al.
patent: 6266001 (2001-07-01), Fang et al.
patent: 6344765 (2002-02-01), Taguchi
patent: 6768352 (2004-07-01), Maher et al.
Frans Yohan U.
Nguyen Nhat M.
Wang Yueyong
Le Don
Lee & Hayes PLLC
Rambus Inc.
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