Double quadrature with adaptive phase shift for improved phase reference performance
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United States of America Patent
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Mar 6, 2018
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Oct 21, 2014
filing date -
Jul 29, 2014
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Abstract
A method for correcting a timing error in a test and measurement instrument. The method includes receiving a clock signal at each of four samplers. The first clock signal is sampled at the first sampler at a first phase, the second clock signal is sampled at the second sampler at a second phase that is 90 degrees offset from the first phase, the third clock signal is sampled at the third sampler at a third phase that is 45 degrees offset from the first phase, and the fourth clock signal is sampled at the fourth sampler at a fourth phase that is 90 degrees offset from the third phase. Each of the outputs from the samplers are digitized and a timing correction is calculated based on the digitized outputs from the digitized outputs.
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