Idea of all-digital I/Q modulator*
Abstract
The polar RFDAC of the preceding chapters was commercially proven for narrowband wireless cellular modulation standards. However, due to the unavoidable bandwidth expansion, it is less attractive in wideband modulation standards. This chapter proposes a method to convert the previously described all-digital RFDAC into the in-phase/quadrature (I/Q) configuration that avoids the bandwidth expansion. The key idea is a 25% duty-cycle clocking.
Keywords
In-phase/quadrature (I/Q); Cartesian modulator; Orthogonal summation; Duty cycle; Matching network
As discussed in the preceding ...
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