`jomiey>01]U0
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`ofJOAJUOY8SIONMOTrOL
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`jeysAig
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`JO}E]IISO
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`JOMOdMO]
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`SOL
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`901
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`OOL
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`
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`
`
`Vdd
`
`200
`
`FIG. 2
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`
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`|vee
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`yayngalxnagoeqgtedoe
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`SIONMO7]
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`Jou]
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`jo1jU04y
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`yup)
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`je}sAug
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`JOJE|LOSO
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`€Sls8ZL
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`JOYINGevgoeOBEOA
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`O0€
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`201”\
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`ccoBLE<<JoyWWIT
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`JEModMOTBIUTIIIJII
`
`
`
`
`
`FIG. 4
`
`
`
`J8MOdqMO]
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`JOU]
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`OSIONMO7]
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`JO}UIT
`
`cOL
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`3SIONMO] 00S
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`8|40}2]/19SO
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`jo1JU0D
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`JOMOdMO7]
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`debpueg
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`jo1jU05
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`wun
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`deBpueg
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`
`
`600
`
`\
`
`602
`
`
`Low-power
`Low power mode/
`Low noise?
`
`604
`
`608
`
`Low-noise
`
`
`
`
`
`
`
`
`
`Switching a voltage
`Switching a voltage
`
`reference input to a low-
`reference input to a low-
`
`
`noise bandgapvoltage
`power bandgapvoltage
`
`reference
`reference
`
`
`
`
`
` Powering down the low-
`Powering downthe low-
`power bandgap voltage
`
`
`noise bandgapvoltage
`
`reference
`
`reference generator
`
`610
`
`
`
`
`Providing a constant
`
`voltage output using an
`
`LDOto a crystal
`oscillator
`
`614
`
`
`
`Generating a clock
`signal using the crystal
`oscillator
`
`
`
`FIG. 6
`
`
`
`700
`
`702
`
`
`
`Low-noise Low-power/ow-power/ low:
`
`noise mode?
`
`
`
`
`
`
`Selecting the low-
`
`poweroutput clock
`signal from the low-
`powerlimiter
`
`
`704
`
`708
`
`
`Selecting the low-
`noise output clock
`
`signal from the low-
`noise limiter
`
`706
`
`710
`
`
`
`
`Powering downthe
`Powering down the
`low-noise limiter
`low-powerlimiter
`
`
`
`
`
`FIG. 7
`
`
`
`800
`
`\ 802
`
`Low-power
`
`Low-power/
`ow-noise mode?
`
`
`
`Low-noise
`
`
`
`voltage reference
` Switching a voltage reference
`
`input to a low-power bandgap
`voltage reference
`
`
`
`804
`
`Switching a voltage reference
`input to a low-noise bandgap
`
`Powering down the low-
`noise bandgap voltage
`
`reference generator
`signal
`
`Providing a constant
`voltage output using a LDO
`to a crystal oscillator and
`generating an input clock
`
`
`
`
`
`Selecting the output clock
`signal from the low-power
`limiter
`
`808
`
`812
`
`816
`
`820
`
`
`
`
`Powering downthe low-
`powerbandgap voltage
`reference generator
`
`
`
`
`
`
`Providing a constant
`voltage output using a LDO
`
`to a crystal oscillator and
`generating an input clock
`signal
`
`
`
`
`
`
`
`Selecting the output clock
`signal from the low-noise
`limiter
`
`Powering downthe low-
`noise limiter
`
`Powering downthe low-
`powerlimiter
`
`FIG. 8
`
`806
`
`810
`
`814
`
`818
`
`822
`
`
`
`Computer System 900
`
`Processor 904
`
`Main Memory 905
`
`Removable
`Storage Unit 915
`
`Removable
`
`Interface 924 Communications Path 926
`
`Storage Unit 902
`
`Communication
`Infrastructure
`906
`
`Secondary Memory 910
`
`Hard Disk Drive
`912
`
`Removable Storage
`Drive 914
`
`Interface 920
`
`Communications
`
`FIG. 9
`
`