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US 2020/0186100 A1Published application
Circuits and methods for providing a trimmable reference impedance
AssigneeArm Limited
InventorEl Mehdi Boujamaa
Life of this patent
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Abstract
Briefly, embodiments of claimed subject matter relate to determination of a high-impedance state or a low-impedance state of a resistive memory element over a wide range of temperature, such as temperatures approaching −40.0° C. to temperatures approaching +125.0° C. Such determination may be brought about by implementing a circuit which, according to various embodiments described herein, emulates a reference impedance having a negative temperature coefficient.
Claims21
A circuit, comprising:
- first and second current sources to provide current to corresponding input signal nodes of first and second impedances;
- an amplifier having input signal nodes coupled to the corresponding input signal nodes of the first and second impedances;
- and
- a transistor circuit having a gate coupled to an output signal node of the amplifier, wherein the drain-to-source impedance of the transistor circuit emulates a negative temperature coefficient that is based on a difference between the first and the second impedances.
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A method, comprising:
- activating first and second current sources to provide first and second electric currents for coupling to corresponding input signal nodes of first and second impedances, wherein the input signal nodes of the first and the second impedances are coupled to corresponding first and second input signal nodes of an amplifier;
- coupling a signal from the amplifier to a transistor circuit, wherein drain-to-source impedance of the transistor circuit emulates a negative temperature coefficient that is based on a difference between the first and the second impedances;
- and
- determining the state of a resistive memory element based on the voltage of the signal coupled from the amplifier to the transistor circuit.
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A circuit to generate, comprising:
- first and second current sources to provide substantially identical currents to corresponding input signal nodes of first and second impedances;
- an amplifier having input signal nodes coupled to the corresponding input signal nodes of the first and second impedances;
- and
- a transistor circuit having a first node coupled to an output signal node of the amplifier and having a second node coupled to an output signal node of an impedance of the first and second impedances, wherein the drain-to-source impedance of the transistor circuit exhibits a reference impedance that is based on a difference between the first and the second impedances.
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Dependencies are inferred from the claim text.