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DACs sampling frequency is chosen according to the  frequency. It has to be high enough to avoid  noise overlapping. Targeted communication standards require high Sigma-Delta frequencies and therefore significant sampling frequency for DACs. In the structure (b), envelope and phase signals (ρ(t) and  (t)) are calculated and processed independently. The output of the low-pass sigma-delta modulator is analog. The digital phase signal is converted by a DAC and then modulated to the carrier frequency (fc).

For the same PAPR, the power amplifier efficiency also depends on the average output power. The power supply of the PA should be adjusted in order to take into account the desired average output power and keep a constant efficiency on a large range of average output power. Different kinds of polar architectures have been proposed as candidate solutions for high PAPR management or for adjustment of power supply to the average power. The terminology is not very stable. But, one can distinguish: - Polar lite architectures.

A) (b) (c) Fig. 19. (a) Polar Sampled Architecture, PSA, with 2 DACs. (b) PSA with a single DAC and an analog mixer. (c) PSA with a single DAC and with digital mixing. , 2008], see Fig. 19. In the structure (a) of this figure,  modulator output is digital, as well as I(t) and Q(t) (ρcos() and ρsin()). Therefore, two DACs are necessary before the IQ modulator. DACs sampling frequency is chosen according to the  frequency. It has to be high enough to avoid  noise overlapping. Targeted communication standards require high Sigma-Delta frequencies and therefore significant sampling frequency for DACs.

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Analyzing Delayed-Fission Gamma Yields [pres. slides]


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