Design of SC Delta-Sigma Modulators for Multistandard RF Receivers
281
low-pass modulator in the I-branch with its flipped-over version (90 degrees out of
phase)—that is, the ideal NTF of the low-pass modulator in the Q-branch.
Modulator Specifications
The specifications of the ∆Σ modulators highly depend on the selectivity, sensitivity,
linearity, and dynamic range requirements for the multistandard RF receiver. Table
8.2 summarizes the radio specifications of the multistandard RF receiver
[24][25][26]. The next logical step is to translate the specifications in the table into
the design requirements for the ∆Σmodulators.
The in-band blockers
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