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

By Benoit Dufort

ISBN-10: 1461369681

ISBN-13: 9781461369684

ISBN-10: 1461543770

ISBN-13: 9781461543770

Analog try out sign new release utilizing Periodic SigmaDelta-Encoded Data Streams provides a brand new option to generate top of the range analog indications with low complexity. The thought of periodic SigmaDelta-encoded bitstreams is gifted alongside with a suite of empirical tables to assist decide on the suitable parameters of a bitstream. An optimization method can be defined to aid pick out a section series with the specified attributes. a wide number of indications may be generated utilizing this method. Silicon implementation concerns are mentioned with a particular emphasis on quarter overhead and simplicity of layout. One FPGA circuit and 3 assorted silicon implementations are awarded besides experimental effects. it really is proven that straightforward designs are in a position to producing very excessive precision signals-on-chip. The method is additional prolonged to multi-bit sign new release the place it truly is proven how one can raise the functionality of arbitrary waveform, turbines typically present in earlier and present-day mixed-signal testers. No ameliorations are required, in basic terms the numbers in reminiscence are replaced. 3 assorted calibration ideas to lessen the consequences of the AWG's non-linearities also are brought, including assisting experimental proof.
the main target of this article is to explain an area-efficient process for analog sign new release utilizing SigmaDelta-encoded info circulate. The major features of the process are:

  • excessive caliber indications (SFDR of a hundred and ten dB observed);
  • huge number of signs generated;
  • Bitstreams simply acquired with a quick optimization application;
  • solid frequency answer, appropriate with coherent sampling;
  • easy and quick undefined implementation;
  • usually electronic, other than an simply testable 1-bit DAC and probably a reconstruction filter out;
  • reminiscence already on hand on-chip will be reused, lowering region overhead;
  • Designs could be included into present CAD instruments;
  • excessive frequency new release.

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

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MIA *100%) are plotted in Fig. 3-11 and Fig. 3-12 for a lowpass and bandpass case. The results for a lowpass modulator of order 2 is shown in Fig. 3-II(a). Part (b) of this figure shows the results of an 8th -order lowpass modulator. Similarly, the results for a 2nd_ and 8th -order bandpass modulator are shown in Fig. 3-12. The number of averaged bit streams for each point is 1024 and all modulators have an OSR of 32. Two conclusions can be drawn from these graphs. The first one is the reduction of both the variance and the maximum amplitude as N increases.

Part (b) of this figure shows the results of an 8th -order lowpass modulator. Similarly, the results for a 2nd_ and 8th -order bandpass modulator are shown in Fig. 3-12. The number of averaged bit streams for each point is 1024 and all modulators have an OSR of 32. Two conclusions can be drawn from these graphs. The first one is the reduction of both the variance and the maximum amplitude as N increases. The second is that an increase in modulator order brings the average amplitude closer to the desired amplitude.

The area occupied by the DAC can also be a concern. To replace the multi-bit DAC, it is possible to use a ~Ll DAC with one-bit output [24]. This approach will be preferred in a BIST scheme since it is easier to test the ~Ll DAC with digital methods, a I-bit DAC being the only analog component. If an analog filter is required, sufficient margin should be allowed to compensate for process variations. 2 LL\ Oscillator Another approach to generate digital sinewaves is through the use of a digital resonator circuit.

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


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