Triple-trim reference voltage generator
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United States of America Patent
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Apr 29, 2014
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app pub date -
Oct 17, 2012
filing date -
Oct 17, 2012
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Abstract
In one embodiment, a bandgap reference circuit is designed with three trimmable elements to generate a temperature-independent bandgap reference voltage VBG: a VBG adjustment resistance ΔR1, a VBG slope adjustment resistance ΔR2, and a curvature compensation adjustment voltage VCU. Instances of the bandgap reference circuit can be trimmed in two phases: a characterization phase during which a triple-trim process determines design-specific trim values for the VBG slope adjustment resistance ΔR2 and the curvature compensation adjustment voltage VCU and a production phase during which a single-trim process determines instance-specific values for the VBG adjustment resistance ΔR1. Since the characterization phase can be applied to a relatively small number of instances of the bandgap reference circuit, the two-phase trimming technique is suitable for efficient mass production and high production yield.
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