Delay line calibration
First Claim
1. An apparatus for signal processing, comprising:
- a delay line having a delay that is adapted to be adjusted in accordance with a control signal;
a feedback path adapted to couple an output of the delay line to an input of the delay line;
a counter coupled to the output of the delay line and adapted to generate a count by counting pulse signals outputted by the delay line; and
a controller coupled to an output of the counter and adapted to generate the control signal based on the count.
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Accused Products
Abstract
A tunable delay line is calibrated to maintain the delay of the delay line at a desired value or within a desired range of values. In some aspects a signal is passed through a delay line multiple times so that the cumulative delay of the signal through the delay line (e.g., as indicated by a count) may be calculated over a period of time. The count is compared with an expected count and, based on this comparison, the delay of the delay line is adjusted as necessary. In some aspects the signal may comprise a digital signal. In some aspects a delay through a delay line may be calculated based on analysis of amplitude changes in a signal caused by a phase shift imparted on the signal by the delay line. In some aspects a delay line is incorporated into a transmitted reference system to generate and/or process transmitted reference signals.
175 Citations
22 Claims
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1. An apparatus for signal processing, comprising:
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a delay line having a delay that is adapted to be adjusted in accordance with a control signal; a feedback path adapted to couple an output of the delay line to an input of the delay line; a counter coupled to the output of the delay line and adapted to generate a count by counting pulse signals outputted by the delay line; and a controller coupled to an output of the counter and adapted to generate the control signal based on the count. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of signal processing, comprising:
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coupling pulse signals outputted by a delay line to an input of the delay line using a feedback path; counting the pulse signals outputted by the delay line; adjusting a delay of the delay line based on the counting; and generating seed pulse signals and feeding the seed pulse signals to the input of the delay line, while concurrently routing the pulse signals outputted by the delay line through the feedback path. - View Dependent Claims (13, 14)
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15. A method of signal processing, comprising:
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coupling pulse signals outputted by a delay line to an input of the delay line; counting the pulse signals outputted by the delay line; adjusting a delay of the delay line based on the counting, wherein adjusting the delay further comprises comparing an expected count with a count generated by the counting; and adjusting the expected count or the count to compensate for a component delay in a feedback path. - View Dependent Claims (16)
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17. A method of signal processing, comprising:
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coupling pulse signals outputted by a delay line to an input of the delay line; counting the pulse signals outputted by the delay line; adjusting a delay of the delay line based on the counting; and adjusting a gain of the pulse signals coupled to the input of the delay line. - View Dependent Claims (18)
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19. A method of signal processing, comprising:
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coupling pulse signals outputted by a delay line to an input of the delay line; counting the pulse signals outputted by the delay line; adjusting a delay of the delay line based on the counting; and regenerating the pulse signals and wherein coupling the pulse signals to the input of the delay line comprises coupling the regenerated pulse signals to the input of the delay line. - View Dependent Claims (20)
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21. An apparatus for signal processing, comprising:
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means for coupling pulse signals outputted by a signal delaying means to an input of the signal delaying means; means for counting the pulse signals outputted by the signal delaying means; means for adjusting a delay of the signal delaying means based on the counting, wherein adjusting the delay further comprises comparing an expected count with a count generated by the means for counting; and means for adjusting the expected count or the count to compensate for a component delay in a feedback path.
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22. A computer-program product, comprising:
a non-transitory computer-readable storage medium encoded with codes for causing an apparatus to; couple pulse signals outputted by a delay line to an input of the delay line; generate a count of the pulse signals outputted by the delay line; adjusting a delay of the delay line based on the count, wherein adjusting the delay further comprises comparing an expected count with the generated count; and adjusting the expected count or the count to compensate for a component delay in a feedback path.
Specification