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This paper describes two techniques for measuring phase noise of a clock using a delta-sigma time-to-digital converter (TDC). One technique uses a reference signal (which has only very small phase noise), and the other does not use a reference signal. Both proposed techniques can be implemented with relatively simple circuitry, due to the following: (i) The clock under test (CUT) is a repetitive signal...
This paper proposes a new architecture of the feedforward multibit DeltaSigmaAD modulator for low power application. The SQNDR (Signal to Quantization Noise and Distortion Ratio) of DeltaSigmaAD modulator is limited by the dynamic range of the input signal and non-idealities of circuit building blocks, particularly by the harmonic distortion in amplifier circuits. In a full feedforward DeltaSigmaAD...
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