The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 10, 1999
Filed:
Nov. 18, 1997
Kamran Iravani, San Jose, CA (US);
VLSI Technology, Inc., San Jose, CA (US);
Abstract
The present invention comprises a noise insensitive current source circuit having a high power supply rejection ratio. The circuit of the present invention is for use with noise sensitive circuits. The circuit of the present invention includes a first reference current source, a second reference current source, and a first, second, third, and fourth transistor. The first transistor has a drain coupled to a power supply and a source coupled to a ground via the first reference current. The second transistor has a drain coupled to the power supply and a source coupled to ground via the second reference current source. The gate of the second transistor is coupled to the gate of the first transistor and to the source of the first transistor. A third transistor has a drain coupled to the power supply and a source coupled to ground via the second reference current source. The gate of the third transistor is coupled to the source of the second transistor. The fourth transistor has a drain coupled to the power supply and a source adapted to coupled to a noise sensitive circuit. The gate of the fourth transistor is coupled to the gate of the third transistor such that the noise sensitive circuit receives a current from the power supply via the fourth transistor and the noise insensitive current source effects a high power supply rejection ratio.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile