Generating and amplifying differential signals

A circuit comprising:

• a first node;
• a second node;
• a first device coupled to the first node and configured to convert a first current through the first device into a first voltage;
• a second device coupled to the second node and configured to convert a second current through the second device into a second voltage;
• and
• a positive feedback amplifier having a first input node and a second input node, the first input node of the positive feedback amplifier coupled to the first node, and the second input node of the positive feedback amplifier coupled to the second node.

A method comprising:

• generating a first voltage signal at a first node by a first device in response to a first current through the first device, the first device coupled to the first node;
• generating a second voltage signal at a second node by a second device in response to a second current through the second device, the second device coupled to the second node;
• amplifying the second voltage signal by a first amplifier, the first amplifier having an input and an output, the input of the first amplifier coupled to the second node, and the output of the first amplifier coupled to the first node;
• and
• amplifying the first voltage signal by a second amplifier, the second amplifier having an input and an output, the input of the second amplifier coupled to the first node, and the output of the second amplifier coupled to the second node.