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模擬集成電路的低電壓系統(tǒng)-Analog ICs for Lo

作者： 時(shí)間：2012-01-30 來源：網(wǎng)絡(luò) 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

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    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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