Versatile common-mode driver methods and apparatus

Details Versatile common-mode driver methods and apparatus Versatile common-mode driver methods and apparatus

2006-04-19

2010-12-21

Cho, James (Department: 2819)

Electronic digital logic circuitry

Interface

Current driving

C326S033000, C327S074000

Reexamination Certificate

active

07855576

ABSTRACT:
Methods and apparatus are provided for selectively setting a CM voltage for a transceiver, reducing the effect of current mismatch, and generating a voltage step that can be used for receiver detection. A circuit of the invention can include voltage generator circuitry operable to generate a plurality of voltage signals of substantially different voltages. The circuit can also include multiplexer circuitry with voltage inputs coupled to the voltage signals. The multiplexer circuitry can be operable to select a reference signal from among the voltage inputs. In addition, the circuit can include operational amplifier (“op-amp”) circuitry with a first input coupled to the reference signal and a second input coupled to an output signal of the op-amp circuitry.

REFERENCES:
patent: 6424221 (2002-07-01), Korn
patent: 6469547 (2002-10-01), Rabii
patent: 6888370 (2005-05-01), Luo et al.
patent: 7095263 (2006-08-01), Liu
patent: 7138819 (2006-11-01), Hashimoto

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