Bandgap reference circuit
By using a combination of current mirror and variable resistor elements in the bandgap reference circuit, the temperature dependence of current and resistance is controlled, solving the problem that the output voltage is easily affected by the power supply voltage and achieving a more stable output voltage.
CN109725676BActive Publication Date: 2026-06-05SYNAPTICS INC
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SYNAPTICS INC
- Filing Date
- 2018-10-30
- Publication Date
- 2026-06-05
AI Technical Summary
Technical Problem
The output voltage of the bandgap reference circuit is easily affected by the power supply voltage, resulting in insufficient stability.
Method used
By employing a combination of current reflectors, pn junction elements, and variable resistors, a relatively temperature-stable output voltage is generated by controlling the temperature dependence of current and resistance.
Benefits of technology
It effectively reduces the temperature dependence of the output voltage and the influence of the power supply voltage, and improves the stability of the bandgap reference circuit.
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Smart Images
Figure CN109725676B_ABST
Abstract
A bandgap reference circuit includes a first current mirror connected to a power supply line and configured to provide a first current to a first node and a second current to a second node (which is 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 that depends on a supply voltage provided to the power supply line.
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