Highly sensitive capacitance measurement for sensors |
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Authors: | Marlow BK Greager DC Kemp R Moore MB |
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Affiliation: | Ind. Res. Ltd., Lower Hutt, New Zealand; |
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Abstract: | Very small capacitance changes from a capacitive transducer can be measured using a custom-designed signal-processing chip. The chip features a switched-capacitor integrator with chopper stabilisation to remove the effects of offset, 1/f noise and switch charge injection; the circuit is insensitive to stray capacitance. The achievement of high resolution and low drift is demonstrated.<> |
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