Circuit and method of biasing a drive transistor to a data bus

Details Circuit and method of biasing a drive transistor to a data bus Circuit and method of biasing a drive transistor to a data bus

1995-02-28

1996-08-20

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327539, 323315, H03K 522

Patent

active

055482333

ABSTRACT:
A data transmitter (12) on a data bus (16) keeps its drive transistor (36) at a minimum bias according to the minimum voltage level on the data bus. The current flowing through the drive transistor in response to a data signal, or a proportional current, is mirrored (52, 54) and compared to a current source (60). Any mismatched between the mirrored current and the current source enables a transistor (58) to bias the drive transistor so that it maintains a minimum conduction state. The base of the drive transistor is held one V.sub.be above the minimum voltage on the data bus. The minimum bias on the base of the drive transistor keeps it conducting so that the transition to full conduction is smooth and prevents any sharp transitions that may cause undesired radiated emissions.

REFERENCES:
patent: 3996498 (1976-12-01), Schade, Jr.
patent: 4081695 (1978-03-01), Allen et al.
patent: 4350904 (1982-09-01), Cordell
patent: 4553044 (1985-11-01), Bittner
patent: 4577125 (1986-03-01), Allen
patent: 4701631 (1987-10-01), Chieli
patent: 4766367 (1988-08-01), Saller et al.
patent: 4906863 (1990-03-01), Van Tran
patent: 5012128 (1991-04-01), Chan

Affiliated with

Also associated with

Rating

Circuit and method of biasing a drive transistor to a data bus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit and method of biasing a drive transistor to a data bus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit and method of biasing a drive transistor to a data bus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2332806