Sub-bandgap reference voltage source
First Claim
1. A sub-bandgap reference source circuit, comprising:
- a current mirror source arranged to supply a same current toa first branch comprising a first bipolar junction transistor, BJT, and a second branch comprising a second bipolar junction transistor, BJT,wherein the first BJT has an emitter current density, which is lower than the emitter current density of the second BJT,wherein the first branch and the second branch are connected at a first node, which is coupled to ground,a first voltage divider comprising a first resistance and a second resistance coupled in series, wherein the first resistance is coupled between a base terminal of the first BJT and a second node, wherein the second resistor is coupled to ground;
a second voltage divider comprising a third resistance and a fourth resistance coupled in series, wherein the third resistance is coupled between the second node and a base terminal of the second BJT, wherein the fourth resistance, is coupled to the first node; and
an output terminal coupled to the second node.
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Accused Products
Abstract
The present application relates to a sub-bandgap reference source circuit, which comprises a current mirror source, a first branch comprising a first BJT and a second branch comprising a second BJT, the first BJT having an emitter current density lower than an emitter current density of the second BJT, the first branch and the second branch being connected at a first node coupled to ground; a first voltage divider comprising first and second resistances coupled in series, the first resistance being coupled between a base terminal of the first BJT and a second node, the second resistor being coupled to ground; a second voltage divider comprising first and second resistances coupled in series, the first resistance being coupled between the second node and a base terminal of the second BJT, the second resistance being coupled to the first node; and an output terminal coupled to the second node.
9 Citations
15 Claims
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1. A sub-bandgap reference source circuit, comprising:
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a current mirror source arranged to supply a same current to a first branch comprising a first bipolar junction transistor, BJT, and a second branch comprising a second bipolar junction transistor, BJT, wherein the first BJT has an emitter current density, which is lower than the emitter current density of the second BJT, wherein the first branch and the second branch are connected at a first node, which is coupled to ground, a first voltage divider comprising a first resistance and a second resistance coupled in series, wherein the first resistance is coupled between a base terminal of the first BJT and a second node, wherein the second resistor is coupled to ground; a second voltage divider comprising a third resistance and a fourth resistance coupled in series, wherein the third resistance is coupled between the second node and a base terminal of the second BJT, wherein the fourth resistance, is coupled to the first node; and an output terminal coupled to the second node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification