| 摘要 |
PROBLEM TO BE SOLVED: To provide a threshold determination circuit that increases the response speed of an output signal to an input signal by increasing a bias current without increasing the offset of a sensor.SOLUTION: A sensor threshold determination circuit includes: a driving current detection circuit 130 which detects a driving current I; a bias current output circuit 140 which outputs a bias current IB generated by multiplying the driving current I as specified; an impedance conversion circuit 170 which converts output impedance of the sensor 120 into predetermined impedance; a voltage comparator 160 which compares and outputs output voltages VP, VN; and a mirror current generation circuit 100 which generates a mirror current MIB corresponding to the bias current IB so as to feed back the bias current IB supplied to the impedance conversion circuit 170. The sensor threshold determination circuit determines threshold voltages Vx, Vy by supplying the bias current IB only to resistances RSUM1, RSUM2 for impedance conversion. |
