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Additional info for Baseband Analog Circuits for Software Defined Radio (Analog Circuits and Signal Processing)
Example text
Since the folding of spurs into the pass-band is also named aliasing, this continuous-time filter may be called anti-aliasing filter.
A discussion is carried on the optimal specifications aiming at the receiver power minimization. 1, an ADC at the antenna which digitizes different wireless bandwidths simultaneously is not realizable in the foreseeable future. A practical SDR receiver will need a wide-band RF front end that can be tuned to any carrier frequency and channel bandwidth at a time: the Zero-IF architecture is the most attractive solution to achieve this goal thanks to its relative simplicity which means less complexity for a wanted level of flexibility.
6. The RF band is selected by an external passive filter and the signal is amplified by an LNA, as in the superheterodyne architecture. The signal is then mixed directly to DC by a RF quadrature mixer, hence, the rest of the passive filters and mixing stages are unnecessary. 4, it is evident the reduced number of analog components. 6. Direct conversion (zero-IF) receiver architecture. e. the channel select filter, which is responsible for rejection of interferers and anti-aliasing, presents severe power-linearity-noise trade-offs.