| 摘要 |
A device which includes an acceleration sensor for outputting small differential voltages VIP and VIN using resistance changes, and an output amplifier for amplifying the voltage difference. The output amplifier includes an offset-voltage adjustment circuit and an instrumentation amplifier. The instrumentation amplifier includes a first Op-amp having inputs connected to VIP and offset-voltage input terminals, a second Op-amp having inputs connected to VIN and VCOM input terminals, and a third Op-amp having inputs connected to outputs of the first and second Op-amps via resistors. The reference voltage VCOM of the instrumentation amplifier output is also applied to the second Op-amp.
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