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:
Oct. 29, 2002
Filed:
Apr. 28, 1999
Sanjay Manohar Bhandari, Santa Clara, CA (US);
David Allouche, Belmont, CA (US);
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A feedback system includes an emitter-follower as a gain stage in the forward path. The emitter-follower has a very wide band width and does not, by itself, effectively narrow the bandwidth of an information channel in which it is used. Emitter-followers are frequently used as buffers in many gain systems so using an emitter-follower which is already present effectively reduces die area for the feedback system. In an embodiment, the feedback system includes a differentiator with a programmable zero in the feedback path. The zero in the feedback path creates a pole in the forward path and the programmed location of the zero influences the pole and controls the bandwidth of the forward path. The emitter-follower also buffers the differentiator so that it does not effect the operation of any prior gain stages in which the feedback system is used. A switch in the feedback path enables the differentiator to be turned off or switched out of the loop so that the forward path is not effected when bandwidth reduction is not required. With appropriate switching, the same differentiator is used to create a zero in the forward path as well as pole in the forward path.