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:
Mar. 24, 2015
Filed:
Mar. 07, 2014
Applicant:
Nxp B.v., Eindhoven, NL;
Inventor:
Marco Berkhout, Tiel, NL;
Assignee:
NXP B.V., Eindhoven, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05F 1/10 (2006.01); G05F 3/02 (2006.01); G05F 3/26 (2006.01); H03K 17/042 (2006.01); H03F 3/00 (2006.01);
U.S. Cl.
CPC ...
G05F 3/02 (2013.01); G05F 3/262 (2013.01); H03K 17/04206 (2013.01); H03F 3/00 (2013.01);
Abstract
A switchable current source in which a reference voltage value to be used in driving the gate of an output transistor is sampled and stored. The reference voltage is derived using a reference current source which feeds a current sensing transistor. The current sensing transistor is turned off when the output transistor is turned off, so that the reference current source then does not consume power. A large reference current Iref can then be used for a short time.