DUTY CYCLE CORRECTION ON AN INTERVAL-BY-INTERVAL BASIS
First Claim
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1. A circuit comprising:
- a measurement circuit configured to;
receive an input signal comprising a plurality of transitions, each transition being a rising transition or a falling transition; and
measure an average time interval duration of a pair of consecutive time intervals of the input signal, each time interval defined by a pair of consecutively occurring transitions of the input signal; and
an output circuit configured to generate an output signal comprising a time interval having a duration set to the average time interval duration.
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Abstract
A duty cycle correction system corrects for duty cycle distortion by measuring average time interval durations of consecutive intervals of an input signal. The system generates complementary ramp signals that have cross-points indicating midpoints of the intervals, and detects those cross-points. An output circuit of the duty cycle correction system generates an output signal that performs rising and falling transitions in response to the detected cross-points.
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Citations
22 Claims
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1. A circuit comprising:
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a measurement circuit configured to; receive an input signal comprising a plurality of transitions, each transition being a rising transition or a falling transition; and measure an average time interval duration of a pair of consecutive time intervals of the input signal, each time interval defined by a pair of consecutively occurring transitions of the input signal; and an output circuit configured to generate an output signal comprising a time interval having a duration set to the average time interval duration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A circuit comprising:
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a detection circuit configured to detect midpoints of a plurality of time intervals of an input signal comprising a plurality of transitions, each transition being a rising transition or a falling transition, each time interval defined by a pair of consecutively occurring transitions of the input signal, the input signal comprising a plurality of cycles, each cycle of the plurality of cycles comprising two time intervals of the plurality of time intervals; and an output circuit configured to set durations of consecutive time intervals of an output signal according to the detected midpoints of the plurality of time intervals of the input signal. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A system comprising:
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an input circuit configured to receive a pair of complementary input signals comprising a first input signal and a second input signal; a ramp generation circuit configured to; generate a first pair of complementary ramp signals that transition over time durations corresponding to pulse durations of pulses of the first input signal; and generate a second pair of complementary ramp signals that transition over time durations corresponding to pulse durations of pulses of the second input signal; a cross-point detection circuit configured to detect a plurality of consecutive cross-points of the first and second pairs of complementary ramp signals; and an output circuit configured to set durations of consecutive intervals of an output signal in response to detection of the plurality of consecutive cross-points of the first and second pairs of complementary ramp signals. - View Dependent Claims (20)
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21. A circuit comprising:
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means for generating pairs of complementary ramp signals that ramp up and ramp down over ramp periods corresponding to time durations of time intervals of an input signal, the pairs of complementary ramp signals comprising; a first pair of complementary ramp signals that ramp up and ramp down for durations corresponding to durations of a first set of the time intervals during which the input signal is at an associated high level; and a second pair of complementary ramp signals that ramp up and ramp down for durations corresponding to durations of a second set of the time intervals during which the input signal is at an associated low level; means for detecting cross-points of the pairs of complementary ramp signals; and means for generating an output signal that performs rising and falling transitions in response to the detected cross-points.
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22. A method comprising:
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frequency dividing an input signal to generate a first set of pre-intermediate signals; generating a second set of pre-intermediate signals that transition over ramp periods corresponding to time windows established by the first set of pre-intermediate signals; generating a set of intermediate signals that transition in response to detected cross-points of the second set of pre-intermediate signals; generating a first set of post-intermediate signals based on combinations of two signals of the set of intermediate signals; halving pulse widths of pulses of the first set of post-intermediate signals to generate a second set of post-intermediate signals; combining pulses of the second set of post-intermediate signals to generate a third post-intermediate signal; and frequency dividing the third post-intermediate signal to generate an output signal.
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Specification