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US 6,661,213 B2Granted
On-chip filter-regulator, such as one for a microprocessor phase locked loop (PLL) supply
AssigneeIntel Corporation
InventorsEyal Fayneh, Ernest Knoll
Life of this patent
Estimating the term…
Abstract
An on-chip, e.g., on a microprocessor, super filter-regulator acts as a voltage regulator and a low-pass filter. The voltage regulator generates a constant DC output voltage and regulates the DC voltage against instantaneous load changes. The low-pass filter and actively filters AC interference out of the DC output voltage. The super filter-regulator provides the filtered and regulated DC voltage to a phase locked loop circuit.
Claims26
A system, comprising:
- a power supply to generate a peripheral voltage;
- and
- a microprocessor coupled to the power supply and to a core voltage supply, the microprocessor having a filter-regulator coupled to generate a direct current (DC) voltage, to regulate the DC voltage against instantaneous changes in loading, to filter interference from the DC voltage, and to generate an output voltage.
An apparatus, comprising:
- a single integrated circuit microprocessor coupled to receive a core voltage and a peripheral voltage, the microprocessor having:
- circuitry to generate a reference voltage;
- a phase locked loop;
- an operational amplifier coupled to the circuitry to receive the reference voltage on a non-inverting input to generate an output voltage and to the phase locked loop to drive the phase locked loop;
- and
- a resistor-capacitor circuit coupled between the circuitry to generate a reference voltage and the non-inverting input of the operational amplifier to filter alternating current (AC) fluctuations in the reference voltage.
3 more elements
An apparatus, comprising:
- a microprocessor coupled to receive a core voltage and a peripheral voltage, the microprocessor having:
- circuitry to generate a reference voltage from the peripheral voltage;
- a phase locked loop;
- and
- an operational amplifier coupled to the circuitry to receive the reference voltage on a non-inverting input to generate an output voltage and to the phase locked loop to drive the phase locked loop.
2 more elements
Dependencies are inferred from the claim text.