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模擬集成電路的低電壓系統(tǒng)-Analog ICs for Lo

作者: 時間:2012-01-30 來源:網(wǎng)絡 收藏
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Power Savings from Low-Voltage Operation

The power saved by reducing a system supply voltage from 5V to a lower value can be dramatic. For resistive and capacitive loads, power saved is proportional to the voltage squared. For constant-current loads such as references and op amps, the savings are linear. For constant-power loads such as hard-disk drives, the switch to low voltage does not save power, but requires the device to operate at a lower input voltage. Table 2 summarizes the power savings offered by lower voltage systems as compared to 5V systems.

Table 2. Power Savings Compared to 5V When Using Lower Voltages

            Load TypePower-Savings
            Formula
            Power Savings Compared to 5V (%)
            1.8V
            Operation
            2.5V
            Operation
            3V
            Operation
            3.3V
            Operation
            Resistive(1 - (V / 5)2) x 10087756456
            Capacitive(1 - (V / 5)2) x 10087756456
            Constant Current(V / 5) x 100645040

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