Voltage rail noise sensing circuit and method

摘要

Apparatus and methods level shift a direct current (DC) component of a voltage rail signal from a first DC level to a second DC level such that voltage rail noise can be determined. The actual voltage rail noise can be compared to an expected amount of noise for analysis and validation of simulation models. Such assessment can be used to validate simulation models used to refine a design of an integrated circuit or as part of built-in self test.

主权项

1. An integrated circuit comprising:
a noise sensing circuit having an input voltage operating range; and a voltage level shifter coupled to the voltage signal measurement circuit to level shift a DC component of a voltage rail signal from a first voltage level to a second voltage level, wherein the first voltage level is outside the input voltage operating range of the noise sensing circuit, and wherein the second voltage level is within the input voltage operating range, wherein the voltage rail signal is sourced from a voltage rail within the integrated circuit.