Current injected ramp with reduced recovery time background of t

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Generating sawtooth or triangular output

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

327131, H03K 19084

Patent

active

059735228

ABSTRACT:
A ramp circuit discharges an output capacitor to generate a substantially linear ramp signal, current injection is used to stabilize the ramp's output, reducing overshooting and ringing. With faster output stabilization, the ramp exhibits significantly faster repetition rates suitable testing high speed components such as RAM, microprocessors, high speed logic, and the like. The ramp includes an output transistor, with its output defining an output node coupled to a current source and a charge storage device such as a capacitor. The charge storage device charges when the transistor is "on". Namely, when the transistor is turned on, the output charge storage device is coupled to a reference voltage, which charges the device in a fixed time. When the transistor is turned "off", the charge storage device discharges, aided by the flow of current through the current source, resulting in the linear ramp signal. After the charge storage device discharges, current injection is used to quickly stabilize the ramp's output. Particularly, while the output transistor is turned on, permitting the charge storage device to recharge, a transistor couples a bias current source to the output node. Specifically, the transistor is configured to selectively couple the bias current source to the output node when the output transistor is turned on, or a predetermined time thereafter. Conversely, the transistor selectively decouples the bias current source from the output node when the ramp output arrives within a predetermined threshold value of the target ramp starting value.

REFERENCES:
patent: 3411153 (1968-11-01), Steele
patent: 4409494 (1983-10-01), Smith
patent: 4421995 (1983-12-01), Gottschalk
patent: 4503396 (1985-03-01), Fawkes
patent: 4739192 (1988-04-01), Price, Jr.
patent: 4774497 (1988-09-01), Taylor
patent: 4779013 (1988-10-01), Tanaka
patent: 4885585 (1989-12-01), Barrow et al.
patent: 4950929 (1990-08-01), Yan
patent: 5025176 (1991-06-01), Takeno
patent: 5241221 (1993-08-01), Fletcher et al.
patent: 5329175 (1994-07-01), Peterson
patent: 5406215 (1995-04-01), Asahina
patent: 5483183 (1996-01-01), Dunn et al.
patent: 5502410 (1996-03-01), Dunn et al.
patent: 5514979 (1996-05-01), Collins et al.
patent: 5517143 (1996-04-01), Gross
patent: 5585795 (1996-12-01), Yuasa et al.
patent: 5617051 (1997-04-01), Bingham
patent: 5627486 (1997-05-01), Gross
patent: 5633637 (1997-05-01), Noro
patent: 5825218 (1998-10-01), Colli et al.

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

Current injected ramp with reduced recovery time background of t does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Current injected ramp with reduced recovery time background of t, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Current injected ramp with reduced recovery time background of t will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-768883

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