Patent ID: 11921535
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. A bandgap reference circuit, comprising:
an amplifier having first and second amplifier inputs and an amplifier output, wherein the amplifier is configured to provide a bandgap voltage at the amplifier output;
a first transistor having first and second current terminals and a first control terminal, wherein the first current terminal is connected to the first amplifier input, and the first transistor is configured to pass a first proportional to absolute temperature (PTAT) current;
a second transistor having third and fourth current terminals and a second control terminal, wherein the third current terminal is coupled to the first control terminal, the fourth current terminal is connected to the second current terminal, and the second control terminal is coupled to the second amplifier input, and the second transistor is configured to pass a second PTAT current;
a first resistor coupled to the amplifier and the second transistor, and configured to pass the second PTAT current to the second transistor;
a third transistor having fifth and sixth current terminals and a third control terminal, wherein the fifth current terminal is connected to the second amplifier input, the sixth current terminal is connected to the second current terminal, and the third control terminal is coupled to the second control terminal, and the third transistor is configured to pass a third PTAT current that bypasses the first resistor and the second transistor; and
a second resistor coupled to the second current terminal, the fourth current terminal, and the sixth current terminal, and the second resistor is configured to pass the first PTAT current, the second PTAT current, and the third PTAT current.