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US 10,418,952 B1Granted
Amplifier with hysteresis
AssigneeNXP USA, Inc.
InventorsKumar Abhishek, Srikanth Jagannathan
Life of this patent
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Abstract
An amplifier includes a differential input stage, a hysteresis stage, coupled to the differential input stage, a cascode stage coupled to the hysteresis stage, a feedback stage coupled to an output of the cascode stage and configured to provide a feedback signal to the hysteresis stage, and an output stage coupled to the output of the cascode stage. The output stage includes a hysteresis inverter coupled between the output of the cascode stage and the amplifier output.
Claims19
An amplifier comprising:
- a differential input stage including a non-inverting input and an inverting input;
- a hysteresis stage coupled to the differential input stage;
- a cascode stage coupled to the hysteresis stage, wherein the hysteresis stage is configured to provide hysteresis to an output of the cascode stage;
- a feedback stage coupled to the output of the cascode stage and configured to provide a feedback signal to the hysteresis stage;
- and
- an output stage coupled to the output of the cascode stage, the output stage including an amplifier output, wherein the output stage includes a hysteresis inverter coupled between the output of the cascode stage and the amplifier output;
- wherein the hysteresis stage further comprises:
- a pair of differential transistors including:
- a first transistor including a control electrode coupled to receive the feedback signal;
- and
- a second transistor including a control electrode coupled to receive a second feedback signal from the feedback stage;
- wherein the first transistor is configured to control a current at a first node of the cascode stage, and the second transistor is configured to control a current at a second node of the cascode stage, wherein the hysteresis provided by the hysteresis stage is dependent upon the current at the first node and the current at the second node;
- wherein the amplifier further comprises a current control circuit coupled between a supply terminal and the pair of differential transistors to control current between the pair of differential transistors and the supply terminal, the current control circuit including an input coupled to a node configured to provide a common mode voltage of the inverting input and the non-inverting input.
10 more elements
An amplifier comprising:
- a differential input stage including a non-inverting input and an inverting input;
- a hysteresis stage coupled to the differential input stage;
- a cascode stage coupled to the hysteresis stage, wherein the hysteresis stage is configured to provide hysteresis to an output of the cascode stage;
- a feedback stage coupled to the output of the cascode stage and configured to provide a feedback signal to the hysteresis stage;
- and
- an output stage coupled to the output of the cascode stage, the output stage including an amplifier output, wherein the output stage includes a hysteresis inverter coupled between the output of the cascode stage and the amplifier output;
- wherein the hysteresis inverter of the output stage comprises:
- a first transistor of a first conductivity type and a second transistor of a second conductivity type opposite the first conductivity type, the first transistor and the second transistor each include a control electrode connected to an input of the hysteresis inverter and a current electrode connected to an output of the hysteresis inverter;
- a third transistor of the first conductivity type and a fourth transistor of the second conductivity type, the third transistor and the fourth transistor each include a control electrode connected to the output of the hysteresis inverter and a current electrode connected to an input of the hysteresis inverter;
- wherein the third transistor is characterized as being weaker than the first transistor and the fourth transistor is characterized as being weaker than the second transistor.
7 more elements
An amplifier comprising:
- an output stage configured to provide an amplifier output;
- an input stage having a differential pair of transistors, wherein a control electrode of a first transistor of the differential pair is coupled to a non-inverting input of the amplifier and a control electrode of a second transistor is coupled to an inverting input of the amplifier, wherein the amplifier output switches states in response to a voltage differential between the inverting input and the non-inverting input;
- a hysteresis stage coupled to the input stage;
- a cascode stage coupled to the hysteresis stage, wherein the hysteresis stage is configured to provide hysteresis to an output of the cascode stage, wherein the output stage is coupled to the output of the cascode stage and includes a hysteresis inverter coupled between the output of the cascode stage and the amplifier output;
- and
- a feedback stage coupled to the output of the cascode stage and configured to provide a first feedback signal and a second feedback signal to the hysteresis stage;
- wherein the hysteresis stage further comprises:
- a second pair of differential transistors including:
- a third transistor including a control electrode coupled to receive the first feedback signal;
- and
- a fourth transistor including a control electrode coupled to receive the second feedback signal;
- wherein the first transistor is configured to control a first current at a first node of the cascode stage, and the second transistor is configured to control a second current at a second node of the cascode stage,
- wherein the third transistor is configured to control a third current at the first node of the cascode stage, and the fourth transistor is configured to control a fourth current at the second node of the cascode stage;
- wherein the hysteresis provided by the hysteresis stage is dependent upon the third current at the first node and the fourth current at the second node;
- wherein the amplifier further comprises a current control circuit coupled between a supply terminal and the second pair of differential transistors to control current between the second pair of differential transistors and the supply terminal, the current control circuit including an input coupled to a node configured to provide a common mode voltage of the inverting input and the non-inverting input.
12 more elements
An amplifier comprising:
- an output stage configured to provide an amplifier output;
- an input stage having a differential pair of transistors, wherein a control electrode of a first transistor of the differential pair is coupled to a non-inverting input of the amplifier and a control electrode of a second transistor is coupled to an inverting input of the amplifier, wherein the amplifier output switches states in response to a voltage differential between the inverting input and the non-inverting input;
- a hysteresis stage coupled to the input stage;
- a cascode stage coupled to the hysteresis stage, wherein the hysteresis stage is configured to provide hysteresis to an output of the cascode stage, wherein the output stage is coupled to the output of the cascode stage and includes a hysteresis inverter coupled between the output of the cascode stage and the amplifier output;
- and
- a feedback stage coupled to the output of the cascode stage and configured to provide a first feedback signal and a second feedback signal to the hysteresis stage;
- wherein the hysteresis inverter of the output stage comprises:
- a third transistor of a first conductivity type and a fourth transistor of a second conductivity type opposite the first conductivity type, the third transistor and the fourth transistor each include a control electrode connected to an input of the hysteresis inverter and a current electrode connected to an output of the hysteresis inverter;
- a fifth transistor of the first conductivity type and a sixth transistor of the second conductivity type, the fifth transistor and the sixth transistor each include a control electrode connected to the output of the hysteresis inverter and a current electrode connected to an input of the hysteresis inverter;
- wherein the fifth transistor is characterized as being weaker than the third transistor and the sixth transistor is characterized as being weaker than the fourth transistor.
7 more elements
Dependencies are inferred from the claim text.