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Floating-Gate Techniques For Assessing Mismatch, Bradley Minch
Floating-Gate Techniques For Assessing Mismatch, Bradley Minch
Bradley Minch
I discuss the importance of capacitor matching in the context of using charge stored on floating-gate MOS (FGMOS) transistors to compensate for transistor mismatch in analog circuits. I describe a simple technique that only involves static measurements for assessing the relative mismatch between capacitors. I also show experimental measurements of capacitor mismatch for small capacitors fabricated in 1.2-μm and 0.35-μm double-poly it n-well CMOS process that are commonly available.
Evolution Of A Folded Floating-Gate Differential Pair, Bradley Minch
Evolution Of A Folded Floating-Gate Differential Pair, Bradley Minch
Bradley Minch
The author presents a folded floating-gate MOS (FGMOS) differential pair circuit that is capable of simultaneously providing a rail-to-rail common-mode input voltage range and a rail-to-rail output voltage swing with a low power-supply voltage. In this configuration, the voltage drop across the bias current source is folded up into the same range over which the output voltages swing, facilitating low-voltage operation. The floating-gate charge can be used to trim out the offset voltage of the differential pair and to reduce the required power-supply voltage for a given bias current level. The author provides both a qualitative description of how the …