Programmable logic device with power supply noise monitoring

Details Programmable logic device with power supply noise monitoring Programmable logic device with power supply noise monitoring

2008-04-15

2008-04-15

Raymond, Edward (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C326S038000

Reexamination Certificate

active

11153984

ABSTRACT:
Programmable logic device power supply noise levels are characterized using internal measurements. By making power supply noise measurements internally, noise measurements are made without influence from device packaging or circuit board environmental effects. The input-output circuitry of a programmable logic device is configured to supply a power supply voltage from the output of an output buffer to one of the inputs of a differential input buffer. The other of the inputs of the differential input buffer is provided with a reference voltage from an external voltage reference circuit. The differential input buffer serves as a comparator and generates an output signal based on a comparison of the power supply voltage from the output buffer and the reference voltage. A noise monitoring circuit processes the output of the input buffer. The noise monitoring circuit may be based on a register.

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