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:
Jun. 13, 2006
Filed:
Feb. 10, 2004
Alan Fiedler, Bloomington, MN (US);
Alan Fiedler, Bloomington, MN (US);
Other;
Abstract
So as to compare an amplitude of a differential input signal to a threshold, a signal detection circuit includes first and second matched input signal level-shifters, a comparator threshold generation circuit, and a two-stage comparator. The differential input signal is comprised of a true input signal and a complement input signal, and the first input signal level-shifter is coupled to the true input signal, and the second input level-shifter is coupled to the complement input signal. The comparator threshold generation circuit is matched to the input signal level-shifters and outputs first and second compare voltages. The first stage of the two-stage comparator outputs a low signal if the more positive of the level-shifted input signals is greater than the more positive of the compare voltages. The second stage of the two-stage comparator amplifies the output of the first stage of the two-stage comparator, includes positive feedback to inhibit comparator self-oscillation, and has a sufficiently low bandwidth so as not to pass to its output a momentary pulse at its input during a transition in the differential input signal.