By Lawrence T. Pillage

This accomplished quantity unearths how, utilizing uncomplicated ideas of hassle-free circuit research besides wide-spread numerical tools, readers can building up subtle digital simulation instruments in a position to interpreting huge, advanced circuits. Written by means of 3 of the field's stated specialists, the booklet describes in transparent language an extremely huge variety of makes use of to which circuit simulation rules should be put-from working basic functions, to appreciate why SPICE works often times and never in others.

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As an example, if the input frequency is chosen as 5 kHz, there will be harmonic components at 15 kHz, 25 kHz, 35 kHz, etc. Since only the baseband (0–20 kHz in most examples) is considered for SINAD calculations, only the component at 15 kHz will be taken into account. The SINAD value for this input frequency will therefore be most likely higher than for a slightly lower input frequency which has multiple harmonics in the baseband. e. one which takes most harmonic distortion components into account, in most experiments an input frequency of 1 kHz is used.

2. An analysis of the time domain SINAD measurements for steady-state signals is made in Sect. 3. Next, SINAD measurement results on a non-steady-state signal are discussed in Sect. 4. Finally, the chapter is concluded in Sect. 5. 1 Measuring Signal Conversion Quality Traditional signal quality analysis can only be performed on steady-state signals. However, since real-life signals are, typically, not steady-state and an SDM is a nonlinear system, it could also be interesting to measure the conversion performance for non-steady-state signals.

In the case of a traditional SDM the stability can be determined for a given configuration, but cannot be changed or influenced in any way. 4 Sigma-Delta Modulator Performance Indicators 23 Fig. 21 Illustration of the definition of a limit cycle (left) and an idle tone (right) the available computational resources the stability will vary. It is considered beneficial to have a stable modulator to enable a large input range and high SNR. 2 Limit Cycles and Idle Tones Because of the non-linear behavior of a few-bit SDM, the output signal can sometimes contain correlated frequency components that are not present in the input signal and that are not part of the normal quantization noise floor.

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