Abstract
In this brief, a new modulation scheme called sample-and-hold asynchronous sigma-delta modulation (SH-ASDM), the extension of the classical asynchronous sigma-delta scheme (ASDM), is introduced. The SH-ASDM is aimed to provide an instantaneous time encoding instead of the mean value encoding realized in the ASDM. This eliminates the effect of the dynamic range reduction of output pulses lengths, which appears for high-frequency input signals in ASDM. SH-ASDM outperforms the ASDM by about 3 dB in the signal-to-noise ratio quantization characteristics, in respect to the worst case input signal. The new analytic model of ASDM is also proposed, which decomposes this type of time-encoding into a linear filtering, sampling, and nonlinear sample transformation.
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