Precise rail tracking method for powering dual voltage integrated circuits
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United States of America Patent
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Sep 11, 2001
Issued Date -
N/A
app pub date -
Dec 5, 2000
filing date -
Dec 8, 1999
priority date (Note) -
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Abstract
A rail tracking system and method for providing precise tracking of voltage levels to a dual supply voltage Integrated Circuit. A switch mode DC-DC voltage regulator is used to derive the lower of the two voltage levels from the higher level. The switch mode regulator employs a pulse width modulator (PWM) to derive the lower voltage level. A separate supply source is utilized to power the PWM and the timing of the supply voltage is such that the PWM has reached steady state before the higher voltage level is provided to the regulator.
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