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US 8,041,552 B2Granted
Behavioral modeling of high speed differential signals based on physical characteristics
AssigneeIntergrated Device Technology, Inc.
InventorDavid J. Pilling
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Abstract
A method of modeling the output drivers in an integrated circuit, for example a serializer/deserializer circuit, is provided. In accordance with embodiments of the invention, at least one parameter of the circuit is physically measured and a behavioral model utilizing that parameter is constructed. The behavioral model can then be utilized to predict the behavior of the integrated circuit output drivers.
Claims7
A method of modeling an output driver circuit, comprising:
- physically measuring at least one characteristic of the actual output driver circuit;
- and
- using the at least one characteristic to determine at least one parameter in a behavioral model in order to predict a behavior of the output driver circuit, the behavioral model based on a circuit comprising at least one output driver circuit having a differential amplifier including a first current source having a first current value and an emphasis driver including a second current source having a second current value;
- calibrating the first and second current values with accepted values;
- using the behavioral model to design target integrated circuits having at least one output driver circuit;
- wherein the modeling includes:
- modeling a voltage controlled voltage source section;
- modeling a capacitively loaded inverter section coupled to receive signals from the voltage controlled voltage source section;
- modeling a differential pre-amplifier section coupled to receive signals from the capacitively loaded inverter section;
- modeling a main differential driver coupled to receive signals from the differential preamplifier section;
- and
- modeling an emphasis driver coupled to receive signals from the differential pre-amplifier section and the main differential driver,
- wherein the at least one parameter determines a characteristic of the behavioral model.
10 more elements
Dependencies are inferred from the claim text.