Instrumentation amplifier and related apparatus

An amplifier comprising:

• a first differential input;
• a buffer circuit coupled to the first differential input;
• and
• a second differential input coupled to the buffer circuit,
• wherein:
• the first differential input is configured to generate a first current based on a feedback signal and a second current based on a reference signal;
• the second differential input is configured to generate a first feedback current based on a first output voltage and a second feedback current based on a second output voltage;
• the amplifier is configured to generate a first voltage based on the first current, the first feedback current, and a first load;
• the amplifier is configured to generate a second voltage based on the second current, the second feedback current, and a second load;
• the buffer circuit is configured to shift the first voltage to the first output voltage;
• and
• the buffer circuit is configured to shift the second voltage to the second output voltage.

A method comprising:

• generating, by an amplifier, a first current based on a feedback signal;
• generating, by the amplifier, a second current based on a reference signal;
• generating, by the amplifier, a first voltage based on the first current;
• generating, by the amplifier, a second voltage based on the second current;
• shifting, by the amplifier, the first voltage to a first output voltage;
• shifting, by the amplifier, the second voltage to a second output voltage;
• generating, by the amplifier, a first feedback current based on the first output voltage;
• generating, by the amplifier, a second feedback current based on the second output voltage;
• in response to the first feedback current, generating, by the amplifier, the first voltage based on the first current and the first feedback current;
• and in response to the second feedback current, generating, by the amplifier, the second voltage based on the second current and the second feedback current.