Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Reexamination Certificate
2008-05-06
2008-05-06
Karlsen, Ernest (Department: 2829)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
C324S601000, C326S030000, C363S095000, C702S107000
Reexamination Certificate
active
11262101
ABSTRACT:
Substantially-accurate calibration of output impedance of a device-under-test (DUT) to within a predetermined range of allowable impedance. The DUT is part of a source series terminated (SST) serial link transmitter, in which two branches of parallel transistors each provide an impedance value when particular transistors of the parallel branch are turned on. The impedance value is added to a series-connected resistor to provide the output impedance. The DUT consists of one branch of parallel transistors in series with a resistor. Output impedance of the DUT is compared to the resistance of a reference resistor, and the comparator provides a control signal based on whether the output impedance falls within the pre-set percentage variance of the reference resistance. The control signal is processed by a FSM (finite state machine) that individually turns on or off the transistors within the parallel branch until the DUT impedance value falls within the desired range.
REFERENCES:
patent: 6359464 (2002-03-01), Hui
patent: 6359465 (2002-03-01), Hui
patent: 6373276 (2002-04-01), Hui
patent: 6400178 (2002-06-01), Hui
patent: 6420897 (2002-07-01), Hui
patent: 6472934 (2002-10-01), Pehlke
patent: 6577114 (2003-06-01), Roo
patent: 6670828 (2003-12-01), Ramaswamy
patent: 6788102 (2004-09-01), Atyunin et al.
patent: 6924660 (2005-08-01), Nguyen et al.
patent: 6940303 (2005-09-01), Vargas
patent: 2002/0158659 (2002-10-01), Suzuki et al.
patent: 2003/0234677 (2003-12-01), Atyunin et al.
patent: 2005/0093570 (2005-05-01), Menolfi et al.
patent: 2005/0180521 (2005-08-01), Hsu et al.
Clements Steven M.
Cornwell William P.
Cox Carrie E.
Cranford, Jr. Hayden C.
Norman Vernon R.
Cockburn Josh G.
Dillon & Yudell LLP
Karlsen Ernest
LandOfFree
Impedance calibration for source series terminated serial... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Impedance calibration for source series terminated serial..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impedance calibration for source series terminated serial... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3952180