| 摘要 |
A power supply apparatus for a radio frequency power amplifier (RFPA) is provided, where the output end of a voltage controlled voltage source (VCVS) and the output ends of N current controlled current sources (CCCSs) are coupled in parallel to supply power to the RFPA. The apparatus further includes an nth sampling unit, configured to sample the sum of the output currents of the first (n−1) CCCSs and the VCVS to obtain an nth sampling signal; and an nth filtering unit, configured to filter the nth sampling signal according to a predefined nth passband and output the filtered nth sampling signal to an nth CCCS, thus controlling the output current of the nth CCCS. The nth passband is higher than an (n−1)th passband. The switching frequency of the nth CCCS is higher than the switching frequency of an (n−1)th CCCS. N is an integer greater than or equal to 2, and n is a positive integer smaller than or equal to N.
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