| 摘要 |
PURPOSE:To allow the reduction of an unnecessary voltage generated in a Hall element, by constituting so as to inverse the polarity of a constant current circuit and an amplifier by an analog switch. CONSTITUTION:This circuit is constituted of a power source part 11, an oscillator 12 constituted of a non-stable multi vibrator 12a and a flip-flop circuit 12b, a constant current circuit 13 for Hall element control current constituted of a reference voltage generator 13a and a voltage-current converter 13b, analog switches 14a-14d and 15a-15h driven by outputs Q and Q of the flip-flop circuit 12b, a high input impedance amplifier 16, and a three terminal Hall element 17. By providing analog switches 15a-15h in this manner, the induction voltage generated between Hall element lead wires is modulated by the excitation frequency which drives the analog switches, and can be removed by being passed through a filter. |
