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A noise-shaped direct digital IF to RF (DIF2RF) DAC with embedded upconverter mixer is presented. The digital IF signal is noise shaped by a bandpass Sigma-Delta modulator with 1-bit IF output followed by a semidigital finite impulse response (FIR) filter. The current mode FIR filter combines scaled values of the local oscillator (LO) signal for performing reconstruction filtering and upconversion...
A 1b bandpass DeltaSigma DAC followed by a current steering FIR reconstruction filter and an embedded up-conversion mixer is presented. The RF DAC is implemented in 0.25mum digital CMOS, can be used in low-power digital-IF transmitters and eliminates the need for a transimpedance stage and a separate mixer. The RF DAC draws 49mA from a 2.5V supply, achieving -64.7dBc IM3 at 1.03GHz with an SFDR of...
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