Dave Jackson
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Posts: 6
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Hi Raj, Treat the two drivers (with their respective loads) as black boxes. Pretend that you know nothing else about the drivers other than that one has 1.2V applied across it and the other has 1V applied across it. Since they draw the same current, the driver/load combination with 1.2V will dissipate more power (24mW) than the driver/load combination with 1V across it (20mW). Now think about the loads. Since the two drivers have the same output swing into identical loads, the two loads dissipate the same power (xmW). Subtract xmW from both 24mW and 20mW, and you find that the driver with 1.2V across it still dissipates the higher power. Your driver with 1.2V across it is less efficient (or is being used in a less efficient way) than your driver with 1V across it. Hope this helps, Dave
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