Power supply noise filter

Details Power supply noise filter Power supply noise filter

1995-12-20

1997-05-06

Nappi, Robert

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

H02M 114, H02J 102

Patent

active

056277369

ABSTRACT:
A method and an apparatus for filtering noise from power supplied to a noise sensitive load. A voltage supply circuit is coupled between a first voltage and a second voltage provided on a chip. The voltage supply circuit is configured to supply third voltage. A filter circuit is coupled to the voltage supply circuit to receive and to filter the third voltage. A transistor is coupled between the first voltage and the noise sensitive load and the filter circuit is coupled between the gate of the transistor and the voltage supply circuit. The transistor is coupled in a source follower configuration so as to supply a filtered fourth voltage to the noise sensitive load. In one embodiment, the voltage supply circuit comprises a diode configured transistor such that the output third voltage is equal to the second voltage plus the threshold voltage of the source follower configure transistor. The filter circuit then filters the third voltage and the transistor drops the voltage by the threshold voltage resulting in the noise sensitive load receiving a noise filtered voltage equal to the second voltage.

REFERENCES:
patent: 4934822 (1990-06-01), Higaki
patent: 5319514 (1994-06-01), Walsh et al.
patent: 5371667 (1994-12-01), Nakao et al.

Affiliated with

Also associated with

Rating

Power supply noise filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Power supply noise filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power supply noise filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2137341