SYSTEMS AND METHODS FOR PROVIDING DELAYED SIGNALS
First Claim
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1. A variable delay apparatus comprising:
- a calibrating unit receiving a signal from a variable delay unit and from a plurality of fixed delay sources, said calibrating unit comparing said signal from said variable delay unit with a plurality of signals from said fixed delay sources to control operation of said variable delay unit over a delay range independently of environmentally-induced drift.
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Abstract
A variable delay apparatus comprises a calibrating unit receiving a signal from a variable delay unit and from a plurality of fixed delay sources, the calibrating unit comparing the signal from the variable delay unit with a plurality of signals from the fixed delay sources to control operation of the variable delay unit over a delay range independently of environmentally-induced drift.
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Citations
30 Claims
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1. A variable delay apparatus comprising:
a calibrating unit receiving a signal from a variable delay unit and from a plurality of fixed delay sources, said calibrating unit comparing said signal from said variable delay unit with a plurality of signals from said fixed delay sources to control operation of said variable delay unit over a delay range independently of environmentally-induced drift. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system comprising:
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a programmable variable delay line providing a variable delay to a first trigger signal; a coarse delay unit in communication with said variably delayed trigger signal, said coarse delay unit providing a second delay to said variably delayed trigger signal; a calibration delay unit providing at least one known, fixed delay; and calibration logic comparing the delay from said calibration delay unit with said variably delayed trigger signal and with a signal from said coarse delay unit and providing input to control said programmable variable delay line in response to said comparing. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system comprising:
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a programmable variable delay unit adding a first delay to a trigger signal, said first delay variable over a delay range; and a calibration unit including a first blown, fixed delay corresponding to a first point in said delay range and a second known, fixed delay corresponding to a second point in said delay range, said calibration unit comparing said first delay with said first and second known, fixed delays, said calibration unit further providing control input to control said programmable variable delay unit to maintain said delay range constant over an operating temperature range causing drift in said programmable variable delay unit. - View Dependent Claims (16, 17, 18)
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19. A method comprising:
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receiving a first signal, said first signal including a first delay from a variable delay unit; receiving a second signal, said second signal including a second delay from a known and fixed delay source; comparing said first and second signals; and controlling said variable delay unit to output said first delay substantially the same as said second delay in response to said comparing. - View Dependent Claims (20, 21, 22, 23)
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24. A system comprising:
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a digitally variable delay unit receiving a trigger signal and providing a first delay thereto to produce a first output signal; a coarse delay unit receiving said first output signal and providing a coarse delay thereto to produce a second output signal; a switching unit receiving said first and second output signals and outputting a selected one of said first and second output signals; and a radar system using said first and second output signals and said trigger signal to perform equivalent time sampling on received data. - View Dependent Claims (25, 26)
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27. A method comprising:
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receiving a trigger signal in a variable delay unit and applying a variable delay thereto to produce a first output signal; receiving the output of said variable delay unit by a coarse delay unit and adding a second delay thereto to produce a second output signal; selectively outputting one of said first and second output signals to produce a third output, said third output having a delay range from a reference zero to a delay equal to a defined maximum variable delay plus said second delay; and applying said third signal and said trigger signal in a radar system to perform equivalent time sampling on a received waveform. - View Dependent Claims (28, 29, 30)
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Specification