Dynamic power saving video DAC

Coded data generation or conversion – Analog to or from digital conversion – With particular solid state devices

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

341144, H03M 166

Patent

active

054899028

ABSTRACT:
Power dissipation is reduced in a video DAC by providing a sleep mode in which DAC current sources are shut off during the blanking period in a manner that allows them to be rapidly turned back on at the end of sleep mode. In particular, a digital to analog converter includes a current source for producing a current, a current steering circuit connected to the current source, the current steering circuit including switches responsive to first and second control signals, respectively, for steering the current into either a load or a current return path, and a control circuit for generating the first and second signals each as a logical combination of a video data signal and a sleep signal. The sleep signal, when it is active, causes both the first and second switches to turn off, which in turn causes the current source to turn off. In a preferred embodiment, the switches are MOSFETS having low gate capacitance. At the end of sleep mode, the current source may be rapidly turned back on by turning on one of the MOSFETS. Performance of the video DAC is therefore not affected, while power dissipation is substantially reduced, facilitating higher-level integration and compliance with the Green PC standard. Reduced power dissipation also allows for use of an inexpensive chip package, reducing manufacturing cost, and increases reliability of the chip.

REFERENCES:
patent: 5023614 (1991-06-01), Fung et al.
patent: 5184129 (1993-02-01), Fung et al.
patent: 5369402 (1994-11-01), Kwon

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

Dynamic power saving video DAC does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dynamic power saving video DAC, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamic power saving video DAC will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2177579

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