Download Data Converters by Franco Maloberti PDF

By Franco Maloberti

This e-book is the 1st graduate-level textbook proposing a entire therapy of information Converters. It presents finished definition of the parameters used to specify information converters, and covers the entire architectures utilized in Nyquist-rate info converters. The booklet makes use of Simulink and Matlab greatly in examples and challenge units. this can be a textbook that also is crucial for engineering execs because it was once written in keeping with a scarcity of organically equipped fabric at the subject. The booklet assumes a fantastic historical past in analog and electronic circuits in addition to a operating wisdom of simulation instruments for circuit and behavioral research.

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The function, as already mentioned, is obtained by cascading a sample-and-hold (S&H) and a low pass (reconstruction) filter. 27. fs 2fs 3fs 4fs 5fs Amplitude response of the ideal and real sample-and-hold. 39) sτ where τ is a suitable gain factor whose dimension is time for making HS&H dimensionless. 40) showing a phase shift proportional to ω and an amplitude attenuation proportional to the sinc (=sin(x)/x) function. Fig. 40) with the magnitude response of the ideal reconstruction filter. Notice that the S&H filter causes signal attenuation in the Nyquist interval.

Dynamic specifications. Digital and switching specifications. 1 General Features Most of the general features are self-explanatory. However, for the others it is worth recalling the definitions or providing some comments. Type of Analog Signals: the analog input or output of a data converter can be single-ended, pseudo-differential or differential. Single-ended analog signals are referred to a common ground that is connected to the analog ground of the converter. Pseudo-differential signals are symmetrical with respect to a fixed reference voltage that can differ from the analog ground of the converter.

Observe that if the signal band is a small fraction of fs then the attenuation caused by the S&H is negligible and compensation is often not necessary. Only when the signal band extends over a good fraction of the band-base can the in-band sinc attenuation become problematic thus needing a compensation filter that mimics in the signal band the x/sin(x) response and drops down in the stop-band region. 28 depicts the typical spectrum of a transcoded signal followed by an S&H. Notice that the base-band spectrum occupies about half of the Nyquist interval.

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