Electronic digital logic circuitry – Interface – Current driving
Patent
1997-10-08
1999-06-29
Mis, David
Electronic digital logic circuitry
Interface
Current driving
326 27, 326 29, 326 60, 326 83, 326 87, H03K 1716, H03K 17687, H03K 19003, H03K 190185
Patent
active
059173408
ABSTRACT:
A twisted-pair current driver is implemented in CMOS. EMI from sharp changes in the current driven is reduced by gradually changing the current driven when the inputs change. The current driver is divided into N differential drivers, each driving one-Nth of the total switching current to the twisted pair. Delay lines delay when input changes are sent to each of the four differential drivers, staggering their response. Either binary or multi-level-transition (MLT-3) data can be transmitted. A binary-to-MLT converter uses a dummy flip-flop to match delays and eliminate encoding glitches. Either the binary or the MLT-3 encoded data is coupled to the inputs of the delay lines and the differential drivers. The mid-level for MLT-3 is driven when both the inputs are high, causing the differential drivers to split the current among the two differential outputs to the twisted pair. The amount of current switched by each differential driver is doubled for multi-level mode to allow receivers to observe the smaller, multiple steps.
REFERENCES:
patent: 4533878 (1985-08-01), Rehm et al.
patent: 5111080 (1992-05-01), Mizukami et al.
patent: 5122690 (1992-06-01), Bianchi
patent: 5263049 (1993-11-01), Winen et al.
patent: 5355391 (1994-10-01), Horowitz et al.
patent: 5418478 (1995-05-01), Van Brunt et al.
patent: 5467369 (1995-11-01), Vijeh et al.
patent: 5485488 (1996-01-01), Van Brunt et al.
patent: 5504728 (1996-04-01), Yokota et al.
patent: 5519728 (1996-05-01), Kuo
patent: 5528636 (1996-06-01), Sevenhans et al.
patent: 5739707 (1998-04-01), Barraclough
Lee Bor
Manohar Amar S.
Auvineu Stuart T.
Mis David
Pericom Semiconductor Corp.
LandOfFree
Twisted-pair driver with staggered differential drivers and glit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Twisted-pair driver with staggered differential drivers and glit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Twisted-pair driver with staggered differential drivers and glit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1378559