| 摘要 |
Provided is a sensor circuit which amplifies a sensor signal with high speed and a high amplification factor without increasing a consumption current. The invention comprises a first amp which amplifies a differential output signal as a current signal of a sensor device in advance, a second amp which amplifies the amplified differential output signal, a constant voltage generation circuit for maintaining a sensor device driving current at a fixed level, and a feedback circuit which adjusts amplification factor by feeding back a feedback signal. Almost the whole current which flows along the first amp is the bias current of the sensor device. |
