| 摘要 |
A system for driving a plurality of loads each connected to respective signal terminals and to a shared common load terminal. Multiple conventional signal amplifiers each provide a content signal at one of the signal terminals. The signal amplifiers each have a primary-power upper terminal, to receive a first voltage (V<SUB>1</SUB>) from a first power supply, and a primary-power lower terminal, to receive a second voltage (V<SUB>2</SUB>) from the first power supply. A bias amplifier biases the common load terminal, and has a secondary-power upper terminal to receive a third voltage (V<SUB>3</SUB>) from a second power supply and a secondary-power lower terminal to receive a fourth voltage (V<SUB>4</SUB>) from the second power supply, wherein V<SUB>2</SUB><=V<SUB>4</SUB><V<SUB>3</SUB><=V<SUB>1</SUB>.
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