Diagram of amplitude detection based on the trigonometric calculation. (IMAGE)
Caption
To obtain amplitude A from an incoming sin wave Asinωct, after the calculation of A2 = A2(sin2ωct + cos2ωct) = (Asinωct)2 + (Acosωct)2 is performed, the square root operation is subsequently performed. So far, a phase-shift-based (PSB) operation that has finite intrinsic latency has been used to calculate Acosωct (blue box shown in the center). Here, the scientists use a differential-based (DB) operation that has zero intrinsic latency to calculate Acosωct (red box shown in the bottom center). Furthermore, it was found that a faster amplitude detection and less invasive imaging were achieved by skipping the square root operation.
Credit
Kanazawa University
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