By Franco Maloberti
This booklet is the 1st graduate-level textbook providing a entire remedy of information Converters. It offers complete definition of the parameters used to specify info converters, and covers the entire architectures utilized in Nyquist-rate info converters. The e-book makes use of Simulink and Matlab largely in examples and challenge units. this can be a textbook that also is crucial for engineering execs because it used to be written in keeping with a scarcity of organically prepared fabric at the subject. The booklet assumes a high-quality heritage in analog and electronic circuits in addition to a operating wisdom of simulation instruments for circuit and behavioral research.
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Extra resources for Data Converters
4 STATIC SPECIFICATIONS The input-output transfer characteristic depicts the static behavior of a data converter. For an ideal case the input-output characteristic is a staircase with uniform steps over the entire dynamic range. Fig. 2 plots the initial part for a generic number of bits. If the ﬁrst and last steps are ∆/2 then the full-scale Notice range is divided by 2n −1 instead of 2n to give ∆. Fig. 2 outlines that a quanThe static characteristic is tization interval can be encoded usthe basis of all the static ing both digital code or midstep point.
All the bits are complemented and the meaning remains the same. Therefore, since (01 · · · 111) denotes the zero crossing in the BOB scheme the zero crossing of COB is becomes (10 · · · 000). BTC - Binary Two’s Complement: is one of the most used coding schemes. The bit in the MSB position indicates the sign in a complemented way: it is 0 for positive inputs and 1 for negative inputs. The zero crossing occurs at (· · · 0000). For positive signals the digital code increases normally for an increasing analog input.
Notice that the S&H ﬁlter causes signal attenuation in the Nyquist interval. 9 dB). 1 (−20 dB) in the ﬁfth Nyquist zone. In summary, an S&H causes an unwanted attenuation in the band-base and leaves a good portion of images in high Nyquist zones. The phase response is an important issue for some applications. For this reason, in addition to the magnitude error the designer must often account for the phase error caused by the sample-and-hold in the signal band and correct it with suitable ﬁlters like an all-pass scheme.
Data Converters by Franco Maloberti