| 摘要 |
A power supply system comprises a parallel arrangement of a linear amplifier (LA) and a DC-DC converter (CO). An output of the linear amplifier (LA) is directly coupled to a load (LO) for supplying a first current (II) to the load (LO). The DC-DC converter (CO) has a converter output coupled to the load (LO) for supplying a second current ( 12 ) to the load (LO). The linear amplifier (LA) comprises a first amplifier stage (OS 1 ) to supply the first current (II), and the second amplifier stage (OS 2 ) to generate a third current ( 13 ) being proportional to the first current (II). The first amplifier stage (OS 1 ) and the second amplifier stage (OS 2 ) have matched components. The DC-DC converter (CO) further comprises a controller (CON) having a control input for receiving a voltage generated by the third current ( 13 ) to control the second current ( 12 ) for minimizing a DC-component of the first current (II).
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