Bandgap reference circuitry
AssigneeSynaptics Incorporated
InventorYasuhiko Sone
Life of this patent
Estimating the term…
Abstract
Bandgap reference circuitry comprises a first current mirror connected to a power supply line and configured to supply a first current to a first node and a second current to a second node virtually-shorted to the first node, a first pn junction element between the first node and a ground line; a first variable resistor element between the second node and the ground line, and a second pn junction element connected in series to the first variable resistor element. The first variable resistor element has a resistance dependent on a power supply voltage supplied to the power supply line.
Claims20
Bandgap reference circuitry, comprising:
- a first current mirror connected to a power supply line and configured to:
- supply a first current to a first node;
- and
- supply a second current to a second node virtually-shorted to the first node;
- a first pn junction element between the first node and a ground line;
- a first variable resistor element between the second node and the ground line, the first variable resistor element having a resistance dependent on a power supply voltage supplied to the power supply line;
- and
- a second pn junction element connected in series to the first variable resistor element.
Bandgap reference circuitry, comprising:
- a first variable resistor element having a resistance dependent on a power supply voltage supplied to a power supply line;
- a current mirror connected to the power supply line, the current mirror configured to:
- supply a first current to a first node;
- and
- supply a second current to a second node virtually-shorted to the first node via the first variable resistor element;
- a first pn junction element connected between the first node and a ground line;
- a second pn junction element connected between the second node and the ground line;
- and
- a first resistor element connected in series to the second pn junction element.
Bandgap reference circuitry, comprising:
- a current mirror connected to a power supply line, the current mirror configured to:
- supply a first current to a first node;
- supply a second current to a second node virtually-shorted to the first node;
- and
- supply a third current to an output node;
- a first pn junction element between the first node and a ground line;
- a second pn junction element between the second node and the ground line;
- a first resistor element connected in series to the second pn junction element;
- and
- a current-voltage converter circuitry between the output node and the ground line, the current-voltage converter circuitry comprising a first variable resistor element having a resistance dependent on a power supply voltage supplied to the power supply line.
Dependencies are inferred from the claim text.