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The thresholding inverters are the key to the TIQ based ADC circuit. For an n-bit ADC, total (2**n)-1 TIQ comparators are required. Each of the (2**n)-1 TIQ comparators are different from each other. We use special layout technique to generate (2**n)-1 unique comparators, the Systematic Parameter Variation (SPV) technique. The SPV technique is based on the spice parameter provided by the chip fabrication vendor.
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