Amplifier and electronic device including amplifier

An electronic device comprising:

• an amplifier;
• a temperature compensation circuit configured to compensate for a change of an amplification factor of the amplifier due to a change of temperature;
• and
• a voltage compensation circuit configured to compensate for a change of the amplification factor of the amplifier due to a change of a power supply voltage, wherein:
• the amplifier includes:
• a current source;
• a first transistor configured to generate a first current from the current source in response to a first input voltage;
• a second transistor configured to generate a second current from the current source in response to a second input voltage;
• a first current mirror configured to sink a third current based on the first current;
• a second current mirror configured to sink a fourth current based on the second current;
• a third transistor including a first terminal at which the third current is generated, a second terminal connected with the temperature compensation circuit, and a gate connected with a second node at which the second current is generated;
• a fourth transistor including a first terminal connected with the second node, a second terminal connected with the temperature compensation circuit, and a gate connected with the first node;
• a third current mirror connected with the first node and configured to generate a fifth current based on the first current and a current flowing through the first transistor;
• a fourth current mirror connected with the second node and configured to generate a sixth current based on the second current and a current flowing through the second transistor;
• and
• a fifth current mirror configured to generate a seventh current based on the fifth current, and
• the amplifier outputs a difference between the sixth current and the seventh current.

An electronic device comprising:

• a processor configured to drive an operating system and applications;
• a display device configured to display a first image and generate a second image under control of the processor;
• an audio device configured to output a first audio signal and generate a second audio signal under control of the processor;
• a system memory used in an operation of the processor;
• a storage device including a nonvolatile memory storing data under control of the processor;
• and
• a power management circuit configured to supply a power to at least one of the processor, the display device, the audio device, the system memory, and the storage device, wherein:
• the power management circuit includes an amplifier, and
• the amplifier includes:
• an input circuit configured to amplify a difference between a first input voltage and a second input voltage to generate a first current and a second current;
• a positive feedback circuit configured to amplify a difference between the first current and the second current to generate a third current and a fourth current and to output a difference between the third current and the fourth current through an output node;
• and
• a temperature compensation circuit configured to adjust an amplification factor of the positive feedback circuit in response to a change of temperature.