Patent ID: 8487660

Claim:
A temperature stable comparator circuit, comprised of: a branch C having a first end, a second end, a first type- 1 device and first type- 2 device, wherein said first type- 1 device and said first type- 2 device are connected to a node O; a branch B having a first end, a second end, a second type- 1 device, a second type- 2 device, and a resistor; and a branch A having a first end, a second end, a third type- 2 device and a current-control device; wherein said first ends of said branch A, branch B, and branch C are commonly connected, and said second ends of said branch B and branch C are commonly connected; wherein said third type- 2 device is diode-connected having a first terminal and a second terminal and having a VCT voltage across the first and second terminals, wherein said second terminal is connected to the first end of the branch A, and said first terminal is connected to the first type- 2 device and the second type- 2 device; wherein said second type- 1 device is diode-connected and is connected to said first type- 1 device; wherein the current in the branches are proportional to absolute temperature (PTAT); and wherein the current in branch A is proportional to the voltage VR.