Reference voltage generation circuit, regulator, and semiconductor device
AssigneeRohm Co., Ltd.
InventorsYusuke YOSHII, Yuki INOUE
Life of this patent
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Abstract
As one example of the invention disclosed herein, a reference voltage generation circuit has: a first reference voltage source generating a first reference voltage; a second reference voltage source generating a second reference voltage having a temperature response different from that of the first reference voltage; a first comparator comparing the first and second reference voltages to generate a first comparison signal; and a selector selectively outputting one of the first and second reference voltages as a reference voltage according to the first comparison signal.
Claims14
A reference voltage generation circuit, comprising:
- a first reference voltage source that generates a first reference voltage;
- a second reference voltage source that generates a second reference voltage, the second reference voltage having a temperature response different from a temperature response of the first reference voltage;
- a first comparator that compares the first and second reference voltages with each other to generate a first comparison signal;
- and
- a selector that selectively outputs one of the first and second reference voltages as a reference voltage according to the first comparison signal.
-24. (canceled)
A semiconductor device, comprising a regulator comprising:
- an amplifier that outputs an amplified voltage so as to keep a feedback voltage and a reference voltage equal;
- a resistor ladder that generates the feedback voltage by dividing the amplified voltage;
- a first switch array that selects one of endmost and middle nodes of a first resistor array included in the resistor ladder to connect the selected node to an output terminal of a constant voltage;
- a second switch array connected in parallel with a second resistor array included in the resistor ladder;
- and
- a decoder that controls the first and second switch arrays according to a trimming signal.
Dependencies are inferred from the claim text.