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:
Dec. 07, 1999
Filed:
Jan. 08, 1999
Arthur J Bellemore, Salem, NH (US);
John M McBride, Peabody, MA (US);
Agfa Corporation, Wilmington, MA (US);
Abstract
A laser diode driver system automatically tracks the difference between the steady state operating point of a feedback signal in response to a laser diode driver circuit operation and the steady state operating point of the same feedback signal in response to a dummy driver circuit operation. That difference is used to compensate the dummy driver circuit operation such that its operating point correlates with the laser diode driver circuit operation. Further, in accordance with a second aspect of the present invention, a laser diode driver system automatically tracks the difference between the steady state operating point of a feedback signal in response to the quiescent laser diode driver circuit operation and the steady state operating point of the same feedback signal in response to the output of a high frequency oscillator. That difference is used to adjust a variable current source such that a dummy driver circuit is not disabled until the laser diode turn-on time delay has expired. The disablement is extended when the current drawn by the current source changes the discharge time of a capacitor that is connected to the enable signal for the dummy driver circuit.