High speed edge detection
First Claim
Patent Images
1. A method, comprising:
- detecting, by a comparator, an edge by determining when an all pass signal is below a low pass signal minus an offset or the all pass signal is above the low pass signal plus the offset;
sending, by the comparator, a latching signal to a latch when the edge is detected; and
holding, by the latch, a last edge location when the latching signal is received from the comparator.
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Abstract
Analog circuits for detecting edges in pixel arrays are disclosed. A comparator may be configured to receive an all pass signal and a low pass signal for a pixel intensity in an array of pixels. A latch may be configured to receive a counter signal and a latching signal from the comparator. The comparator may be configured to send the latching signal to the latch when the all pass signal is below the low pass signal minus an offset. The latch may be configured to hold a last negative edge location when the latching signal is received from the comparator.
9 Citations
13 Claims
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1. A method, comprising:
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detecting, by a comparator, an edge by determining when an all pass signal is below a low pass signal minus an offset or the all pass signal is above the low pass signal plus the offset; sending, by the comparator, a latching signal to a latch when the edge is detected; and holding, by the latch, a last edge location when the latching signal is received from the comparator. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An analog signal detection apparatus, comprising:
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a comparator configured to receive an all pass signal and a low pass signal for a pixel intensity in an array of pixels; and a latch configured to receive a counter signal and a latching signal from the comparator, wherein the comparator is configured to send the latching signal to the latch when the all pass signal is above the low pass signal plus an offset, and the latch is configured to hold a last positive edge location when the latching signal is received from the comparator. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification