| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a signal amplifier circuit wherein a dispersion in a saturation voltage being an output characteristic is small by making the effect of the manufacturing tolerance and the temperature dependence of each circuit component hardly received. <P>SOLUTION: In a lower limit voltage limiting circuit 20, a noninverting input terminal of an operational amplifier 21 is connected to a Vref1 terminal 50 and a Vout terminal 02 is connected to an inverting input terminal of the operational amplifier 21. Further, an anode terminal of a diode 22 is connected to an output terminal of the operational amplifier 21 and a cathode terminal of the diode 22 is connected to the Vout terminal 02. In an upper limit voltage limiting circuit 30, a noninverting input terminal of an operational amplifier 31 is connected to a Vref2 terminal 60 and the Vout terminal 02 is connected to an inverting input terminal of the operational amplifier 31. Further, a cathode terminal of a diode 32 is connected to an output terminal of the operational amplifier 31 and an anode terminal of the diode 32 is connected to the Vout terminal 02. <P>COPYRIGHT: (C)2008,JPO&INPIT |
