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US 9,806,700 B2Granted
Input receiver with multiple hysteresis levels
AssigneeSanDisk Technologies LLC
InventorLakhdar Iguelmamene
Life of this patent
Estimating the term…
Abstract
An integrated circuit (“IC”) includes an input receiver with multiple hysteresis levels. An exemplary input receiver may be an input buffer with a Schmitt trigger that has multiple hysteresis windows between different high and low input voltages. This circuit may improve the input noise immunity of the external input signals and timing by allowing for a selection one of the plurality of levels depending on parameters of the input (e.g. noise level).
Claims20
A method comprising:
- receiving an input signal;
- identifying a speed level and a noise level of a device providing the input signal;
- and
- selecting one of multiple hysteresis levels through a plurality of control signals and transistors, wherein such selection includes an input high voltage and an input low voltage, wherein higher speed and lower noise inputs utilize a smaller hysteresis level with a lower input high voltage and a higher input low voltage, further wherein lower speed and higher noise inputs utilize a larger hysteresis level with a higher input high voltage and a lower input low voltage;
- wherein at least a pair of the control signals is coupled with at least a pair of the transistors to control only a power signal and at least another pair of the control signals is coupled with another pair of transistors to control only a ground, further wherein the control signals control corresponding transistors to establish the multiple hysteresis windows.
2 more elements
An integrated circuit (“IC”) comprising:
- a power supply signal;
- an input signal;
- and
- an input buffer powered by the power supply signal, the input buffer configured to reduce noise of the input signal by generating an output using multiple hysteresis windows, the input buffer comprising:
- a Schmitt trigger circuit that includes transistors and control signals for adjusting an input low voltage and an input high voltage to establish one of the multiple hysteresis windows based on the input low voltage and the input high voltage, wherein at least a pair of the control signals is coupled with at least a pair of transistors to control only the power supply signal and at least another pair of the control signals is coupled with another pair of transistors to control only a ground, further wherein the control signals control corresponding transistors to establish the multiple hysteresis windows.
2 more elements
A method comprising:
- receiving an external input signal at an input buffer;
- reducing input noise of the external input signal with a Schmitt trigger;
- generating multiple levels of hysteresis in the Schmitt trigger that includes transistors and control signals by establishing multiple pairs of input high voltage and input low voltage;
- wherein at least a pair of the control signals is coupled with at least a pair of the transistors to control only the power supply signal and at least another pair of the control signals is coupled with another pair of transistors to control only a ground, wherein the control signals control corresponding transistors to establish the multiple hysteresis windows, which include the difference in the input high voltage and input low voltage for one of the pairs, wherein the input high voltage and the input low voltage are adjustable.
1 more element
A circuit with a Schmitt trigger comprising:
- a plurality of pairs of input low voltage and input high voltage, wherein the input high voltage and the input low voltage are adjustable;
- a plurality of control signals for selecting one or more of the pairs;
- and
- a plurality of transistors;
- wherein at least a pair of the control signals is coupled with at least a pair of the transistors to control only a power supply and at least another pair of the control signals is coupled with another pair of transistors to control only a ground;
- wherein the selection of the control signals corresponds to a selection of both an input low voltage and an input high voltage to establish a hysteresis level, further wherein the control signals control corresponding transistors to establish the multiple hysteresis windows.
3 more elements
Dependencies are inferred from the claim text.