Analog Test Signal Generation Using Periodic ΣΔ-Encoded Data by Benoit Dufort PDF

By Benoit Dufort

Analog attempt sign iteration utilizing Periodic SigmaDelta-Encoded Data Streams provides a brand new way to generate prime quality analog signs with low complexity. The thought of periodic SigmaDelta-encoded bitstreams is gifted alongside with a collection of empirical tables to aid opt for the right parameters of a bitstream. An optimization approach is additionally defined to aid pick out a section series with the specified attributes. a wide number of signs will be generated utilizing this method. Silicon implementation matters are mentioned with a selected emphasis on region overhead and simplicity of layout. One FPGA circuit and 3 diverse silicon implementations are awarded besides experimental effects. it's proven that easy designs are in a position to producing very excessive precision signals-on-chip. The method is additional prolonged to multi-bit sign iteration the place it truly is proven the way to bring up the functionality of arbitrary waveform, turbines in most cases present in earlier and present-day mixed-signal testers. No alterations are required, merely the numbers in reminiscence are replaced. 3 varied calibration options to lessen the consequences of the AWG's non-linearities also are brought, including helping experimental proof.
the main target of this article is to explain an area-efficient method for analog sign new release utilizing SigmaDelta-encoded facts move. The major features of the method are:

  • excessive caliber signs (SFDR of a hundred and ten dB observed);
  • huge number of indications generated;
  • Bitstreams simply received with a quick optimization software;
  • stable frequency solution, suitable with coherent sampling;
  • basic and quickly undefined implementation;
  • generally electronic, other than an simply testable 1-bit DAC and doubtless a reconstruction clear out;
  • reminiscence already to be had on-chip might be reused, lowering region overhead;
  • Designs might be integrated into latest CAD instruments;
  • excessive frequency new release.

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Extra resources for Analog Test Signal Generation Using Periodic ΣΔ-Encoded Data Streams

Sample text

2) k = ---

The SNR, on the other hand, stays constant with N due to the constant power in-band. 23) which shows that increasing N reduces the noise floor level but keeps the total noise power constant. Variations in SNR are observed for very short bit streams, due to the very small number of harmonics in band. 5 Windowing It has been described in the previous sub-section how noise spreading will atTect the SNR and SFDR of a bit stream. Windowing is often suggested in DSPrelated textbooks as a way of counteracting this etTect when performing an FFT.

First, a lowpass modulator of order 6 with an OSR of 64 is used. The random lowpass bit stream is shown in Figure 3-18(a) while the optimized selection is depicted in Figure 3-18(b). A bandpass example is also given, with a random selection in Figure 3-18(c) and the optimized version in Figure 3-18(d). The optimization criterion is based on SFDR. The improvement is clearly visible in the optimized selections. The increase in SFDR is in the order of 35 dB for the lowpass case and 30 dB for the bandpass modulator.

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