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:
Jul. 30, 2002
Filed:
Aug. 22, 2001
Martin G. Guthrie, Mississauga, CA;
Research In Motion Limited, Waterloo, CA;
Abstract
A boot-strapped current switch is provided that includes a biasing network, a control signal, a transistor, a control switch and a boot-strapping circuit. The biasing network generates a substantially constant voltage on a biasing network output. The transistor has a control terminal, a first current-carrying terminal, and a second current-carrying terminal, wherein the first current-carrying terminal generates the output current of the current mirror, and the second current-carrying terminal is coupled to a first potential. The control switch is coupled between the biasing network output and the control terminal of the transistor, and is also coupled to the control signal. The control switch couples the first biasing network output to the control terminal of the transistor when the control signal is in a first state. The boot-strapping circuit is coupled between the control terminal of the transistor and a second potential, and is also coupled to the control signal. The first boot-strapping circuit injects the second potential onto the control terminal of the transistor when the control signal transitions from a second state to the first state in order to decrease the turn-on time of the transistor.