Hybrid switched mode/linear power amplifier power supply for use in polar transmitter
A technology of power amplifier and switch mode, which is applied in the field of DC-DC converter power supply
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[0047] refer to Figure 5 , the present invention provides a hybrid voltage regulator or power supply 30 that combines a switching section 32 that preferably handles most of the power with high efficiency but low bandwidth and a smaller portion of the required power that is best handled with low efficiency but high bandwidth The linear part of 34. The resulting power supply has the required bandwidth and efficiency slightly lower than that of a pure switching power supply but still much higher than that of a pure linear regulator. The resulting hybrid power supply 30 provides an improved output voltage quality since the linear section 34 can be used to compensate for the output voltage ripple typically associated with a pure switching power supply. This is an important advantage since excess output voltage ripple can adversely affect the output spectrum of the PA 6.
[0048] It is to be noted that in principle the amount of power (x) handled by the switching section 32 is gr...
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