Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1991-06-06
1993-02-02
Logan, Sharon D.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341136, H03M 166
Patent
active
051841290
ABSTRACT:
In a CMOS DAC having a plurality of stages a control circuit for selectively switching said DAC between a sleep mode and a normal operating mode with little, if any, surge current resulting therefrom. In the control circuit there is provided control transistors responsive to control signals for applying a reverse biasing potential to a reference voltage transistor and a digital input transistor in each of the stages at a rate such that the rate of change of current in the reference voltage transistor is less than a predetermined magnitude, e.g. less than 5 ma
sec. when said DAC is switched to its sleep mode and transistor means responsive to control signals for first applying a predetermined forward biasing potential to a bias transistor and thereafter changing said reverse potential applied to said reference voltage transistor to a predetermined reference voltage and removing said reverse bias potential from said digital input transistor when said DAC is switched to its normal operating mode.
REFERENCES:
patent: 4521765 (1985-06-01), Wang et al.
patent: 4712091 (1987-12-01), Schoofs et al.
patent: 4716398 (1987-12-01), Eccleston et al.
patent: 4716463 (1987-12-01), Stacy et al.
patent: 4766415 (1988-08-01), Dielacher
patent: 4831282 (1989-05-01), Colles
patent: 4839530 (1989-06-01), Greenwood
patent: 4926064 (1990-05-01), Tapang
patent: 5023614 (1991-06-01), Fung et al.
An Jiu
Campbell David L.
Fung Jimmy
Shyu Steven
Advanced Micro Devices , Inc.
Logan Sharon D.
LandOfFree
Switchable DAC with current surge protection does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Switchable DAC with current surge protection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switchable DAC with current surge protection will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-9208