On-chip high frequency power supply noise sensor
AssigneeInternational Business Machines Corporation
InventorsGeorge Smith, Michael Sperling
Life of this patent
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Abstract
The lower power on-chip power supply noise sensor detects high frequency overshoots and undershoots of the power supply voltage. The sensor has two resistor chains that span the full power rail, with a reactive element to form a low pass filter as part of one of the resistor chains. By this expedient the high frequency transient behavior differs between the two chains, while the low frequency behavior is equivalent. This allows a voltage comparison to be made with comparators. The comparator output can be latched or transmitted as a sampling signal.
Claims8
An on-chip power supply noise sensor between an on-chip power supply and ground, the sensor comprising:
- a. a first resistor series between the power supply and ground;
- and
- b. a low pass filter in parallel with the first resistor series, between the power supply and ground.
A power supply noise sensor between an on-chip power supply and ground, the sensor comprising:
- a. a first resistor series between the power supply and ground;
- and
- b. a low pass filter in parallel with the first resistor series, between the power supply and ground.
Dependencies are inferred from the claim text.