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US 12,001,234 B1Granted
Bandgap circuitry
AssigneeTexas Instruments Incorporated
InventorAhmed Essam Hashim
Life of this patent
Estimating the term…
Abstract
In a described example, a circuit includes a first bipolar junction transistor (BJT) having a first base, a first emitter and a first collector. A second BJT has a second base, a second emitter and a second collector, in which the first collector is coupled to the second collector. A bandgap core circuit has first and second core inputs and a bandgap output. The first core input is coupled to the first emitter, the second core input is coupled to the second emitter, and the first and second bases are coupled to the bandgap output.
Claims18
A circuit comprising:
- a first bipolar junction transistor (BJT) having a first base, a first emitter and a first collector;
- a second BJT having a second base, a second emitter and a second collector, in which the first collector is coupled to the second collector;
- and
- a bandgap core circuit having first and second core inputs and a bandgap output, in which the first core input is coupled to the first emitter, the second core input is coupled to the second emitter, and the first and second bases are coupled to the bandgap output;
- wherein the bandgap core circuit includes:
- a first resistor having first and second resistor terminals, in which the first resistor terminal is coupled to the first emitter;
- a second resistor having third and fourth resistor terminals, in which the third resistor terminal is coupled to the second resistor terminal;
- a third resistor having fifth and sixth resistor terminals, in which the fifth resistor terminal is coupled to the second emitter, and the sixth resistor terminal is coupled the fourth resistor terminal;
- an amplifier having first and second amplifier inputs and an amplifier output, in which the first amplifier input is coupled to the second emitter, the second amplifier input is coupled to the second resistor terminal, and the amplifier output is coupled to the second base;
- and
- a trim resistor coupled between the fourth resistor terminal and a ground terminal, and the trim resistor has a variable resistance.
8 more elements
A circuit comprising:
- a first bipolar junction transistor (BJT) having a first base, a first emitter and a first collector;
- a second BJT having a second base, a second emitter and a second collector, in which the first collector is coupled to the second collector;
- a first resistor having first and second resistor terminals, in which the first resistor terminal is coupled to the first emitter;
- a second resistor having third and fourth resistor terminals, in which the third resistor terminal is coupled to the second resistor terminal;
- a third resistor having a fifth resistor terminal coupled to the second emitter and a sixth resistor terminal coupled the fourth resistor terminal;
- an error amplifier having first and second amplifier inputs and an amplifier output, in which the first amplifier input is coupled to the second emitter, the second amplifier input is coupled to the second resistor terminal, and the amplifier output is coupled to the first base;
- and
- a trim resistor coupled between the fourth resistor terminal and a ground terminal, and the trim resistor has a variable resistance.
5 more elements
A circuit comprising:
- a first NPN bipolar junction transistor (BJT) having a first base, a first emitter and a first collector;
- a second NPN BJT having a second base, a second emitter and a second collector, in which the second collector is coupled to the first collector;
- a bandgap core circuit having first and second core inputs and a bandgap output, in which the first core input is coupled to the first emitter, the second core input is coupled to the second emitter, and the first and second bases are coupled to the bandgap output;
- and
- a voltage supply having a supply output coupled to the first collector;
- wherein the bandgap core circuit includes:
- a first resistor having first and second resistor terminals, in which the first resistor terminal is coupled to the first emitter;
- a second resistor having third and fourth resistor terminals, in which the third resistor terminal is coupled to the second resistor terminal;
- a third resistor having fifth and sixth resistor terminals, in which the fifth resistor terminal is coupled to the second emitter, and the sixth resistor terminal is coupled the fourth resistor terminal;
- and
- a trim resistor coupled between the fourth resistor terminal and a ground terminal, and the trim resistor has a variable resistance.
8 more elements
Dependencies are inferred from the claim text.