On-chip regulator providing good high frequency rejection and noise filtering from the supply
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United States of America Patent
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Aug 24, 1999
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N/A
app pub date -
Jul 9, 1997
filing date -
Jul 9, 1997
priority date (Note) -
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Abstract
A power supply filter has a primary current source coupled to a node carrying a power supply signal. The second end of the primary current source is coupled to an impedance that is further coupled to a low voltage node. A differential amplifier having an inverting input, a non-inverting input, and an output, has its non-inverting input coupled to the junction between the impedance and the primary current source. The output of the differential amplifier carries the filtered power supply signal and is coupled to a capacitance. The capacitance is coupled between the output and a lower voltage. A feedback path is coupled between the output and the inverting input.
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