Digital calibration circuits, devices and systems including...

Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C326S027000, C326S087000, C327S108000, C327S112000

Reexamination Certificate

active

07459930

ABSTRACT:
A calibration circuit for matching the output impedance of a driver by calibrating adjustments to the driver is described. The calibration circuit includes a driver circuit with a plurality of calibration transistors configured to receive a plurality of adjustment signals. The calibration circuit also includes a comparator circuit, and a binary searcher. The driver provides a signal corresponding to an output impedance to the comparator circuit. The output impedance signal is compared to a target impedance, and the comparator circuit then provides logic signals to the binary searcher representing whether the output impedance is greater than the target impedance. The binary searcher then selects a type of step size and count direction, in response to the logic signals, to count the number of steps for adjusting the calibration transistors of the driver.

REFERENCES:
patent: 4908526 (1990-03-01), Mefford
patent: 5065351 (1991-11-01), Johnston et al.
patent: 5239492 (1993-08-01), Hartwig et al.
patent: 5254883 (1993-10-01), Horowitz et al.
patent: 5287063 (1994-02-01), Izawa
patent: 5517191 (1996-05-01), Wynne
patent: 5657456 (1997-08-01), Gist et al.
patent: 5689203 (1997-11-01), Geist
patent: 6009487 (1999-12-01), Davis et al.
patent: 6064224 (2000-05-01), Esch et al.
patent: 6160851 (2000-12-01), Brown et al.
patent: 6313776 (2001-11-01), Brown
patent: 6330193 (2001-12-01), Yu et al.
patent: 6330194 (2001-12-01), Thomann et al.
patent: 6333639 (2001-12-01), Lee
patent: 6384621 (2002-05-01), Gibbs et al.
patent: 6452849 (2002-09-01), Iwamoto
patent: 6459335 (2002-10-01), Darmawaskita et al.
patent: 6462591 (2002-10-01), Garrett, Jr. et al.
patent: 6480798 (2002-11-01), Lee
patent: 6509756 (2003-01-01), Yu et al.
patent: 6549036 (2003-04-01), Lee
patent: 6556052 (2003-04-01), Garrett, Jr. et al.
patent: 6608507 (2003-08-01), Garrett et al.
patent: 6636821 (2003-10-01), Lawson
patent: 6674377 (2004-01-01), Li
patent: 6707421 (2004-03-01), Drury et al.
patent: 6771097 (2004-08-01), Poh Ho et al.
patent: 6772351 (2004-08-01), Werner et al.
patent: 6792372 (2004-09-01), Lee
patent: 6799290 (2004-09-01), Kirihata et al.
patent: 6807650 (2004-10-01), Lamb et al.
patent: 6812888 (2004-11-01), Drury et al.
patent: 6836142 (2004-12-01), Lesea et al.
patent: 6859068 (2005-02-01), Trivedi et al.
patent: 6870419 (2005-03-01), Garrett, Jr. et al.
patent: 6894543 (2005-05-01), Ho et al.
patent: 6897713 (2005-05-01), Nguyen et al.
patent: 6909387 (2005-06-01), Li
patent: 6954391 (2005-10-01), Baker
patent: 6958613 (2005-10-01), Braun et al.
patent: 6963218 (2005-11-01), Alexander et al.
patent: 6965839 (2005-11-01), Floyd et al.
patent: 6980034 (2005-12-01), O'Shaugnessy
patent: 7002367 (2006-02-01), Yu et al.
patent: 7002500 (2006-02-01), Li
patent: 7003043 (2006-02-01), Casper et al.
patent: 7019556 (2006-03-01), Yoo
patent: 7046078 (2006-05-01), Nguyen et al.
patent: 7068193 (2006-06-01), Dempsey et al.
patent: 7078943 (2006-07-01), Ho et al.
patent: 7093145 (2006-08-01), Werner et al.
patent: 7126345 (2006-10-01), Seidel
patent: 7126510 (2006-10-01), Alon et al.
patent: 7129738 (2006-10-01), Lin et al.
patent: 7285977 (2007-10-01), Kim

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Digital calibration circuits, devices and systems including... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital calibration circuits, devices and systems including..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital calibration circuits, devices and systems including... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-4035287

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.