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US 6,605,965 B1Granted
Differential window comparator
AssigneeMicrel, Inc.
InventorFrancisco Fernandez-Texon
Life of this patent
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Abstract
A window comparator is disclosed having a 1st and a 2nd voltage input wherein the window comparator is fully differential with respect to the 1st and 2nd voltage inputs. Two differential pairs control the state of a zero-crossing comparator in response to the difference between the 1st and 2nd voltage inputs.
Claims11
A window comparator having a first input voltage and a second input voltage, comprising:
- a first differential pair of transistors;
- a second differential pair of transistors, wherein the transistors in the first differential pair of transistors are biased to each conduct a first current and the transistors in the second differential pair of transistors are biased to conduct substantially no current when the difference between the first input voltage and the second input voltage equals a positive voltage threshold, and wherein the transistors in the second differential pair of transistors are each biased to each conduct a second current and the transistors in the first differential pair of transistors are biased to conduct substantially no current when the difference between the first input voltage and the second input voltage equals a negative voltage threshold;
- and
- a zero-crossing comparator having a first input coupled to a terminal on a first transistor in the first and second differential pairs of transistors and a second input coupled to a terminal on a second transistor in the first and second differential pairs of transistors.
1 more element
Dependencies are inferred from the claim text.