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US 6,650,170 B1Granted
Temperature compensated output driver
AssigneeIntel Corporation
InventorLawrence S. Uzelac
Life of this patent
Estimating the term…
Abstract
According to some embodiments, a drive circuit provides an output resistance substantially stable despite variations in operating temperature.
Claims22
A circuit, comprising:
- a transistor having a first resistance at a first temperature, said first resistance increasing as said temperature increases;
- and
- a polysilicon resistor, coupled to a drain of said transistor and to an output voltage line, said polysilicon resistor having a second resistance at said first temperature, said second resistance decreasing as said temperature increases.
A circuit, comprising:
- a p-channel transistor having a gate coupled to a first signal line, a source coupled to a first voltage source, and a drain coupled to a polysilicon resistor;
- said polysilicon resistor coupled to an output signal line and to a second polysilicon resistor, said first and second polysilicon resistors formed to each have a resistance which decreases as an operating temperature of said circuit increases;
- an n-channel transistor having a drain coupled to said second polysilicon resistor, a source coupled to a second voltage source, and a gate coupled to a second signal line;
- and
- wherein a signal on said first signal line causes said output signal line to be pulled to a potential of said first voltage source and a signal on said second signal line causes said output signal line to be pulled to a potential of said second voltage source.
2 more elements
A method for operating a circuit, comprising:
- biasing a transistor;
- and
- coupling an output line to a first voltage source through a first resistance provided by said transistor and a second resistance provided by a polysilicon resistor, said first resistance selected to increase as a temperature increases and said second resistance selected to decrease as said temperature increases.
A method, comprising:
- generating a current using a current source;
- and
- generating an output signal having a desired magnitude by driving said current over an effective resistance, said effective resistance created by selectively switching at least one leg of a circuit, each said leg having a transistor coupled in series to a polysilicon resistor, said transistor having a resistance which increases as a temperature increases, said polysilicon resistor having a resistance which decreases as said temperature increases.
A circuit, comprising:
- a switching device, coupled to a first voltage source, said switching device having a resistance;
- a resistor, coupled between said switching device and an output signal line, said resistor and said resistance selected to provide an output resistance that remains substantially stable over variations in an operating temperature of said circuit when said output signal line is coupled to said first voltage source.
A system, comprising:
- a dynamic random access memory to store data from a device, said device comprising at least a first output driver, coupled to provide an output signal to a load device, said at least first output driver having at least a first transistor having a first resistance at a first temperature, and a resistor having a second resistance at said first temperature, said transistor and said resistor selected to have a total resistance which is substantially stable over variations in said temperature.
Dependencies are inferred from the claim text.