| 摘要 |
PURPOSE:To obtain a voltage current converting circuit with high accuracy, high stability and less resistive components by inputting two input voltages respectively two voltage follower circuits and inputting a voltage across an output reference resistor to the voltage current converting circuit respectively. CONSTITUTION:Input voltages V1, V2 from terminals 11, 12 are inputted respectively to voltage follower circuits 51, 52 comprising an operational amplifier 53, a transistor (TR)54, an operational amplifier 56 and a TR58. The TRs 54, 58 are TRs poled oppositely, the emitters are connected mutually via a reference resistor R3 59 and the collectors are connected respectively to power supplies 25, 34 via reference resistors R4 61, 62. A current of (V1-V2)/R3 flows to the resistor 59 and the current flows to resistors 61, 62. The voltage across the resistors 61, 62 is inputted to the voltage current converters 35, 36 comprising an operational amplifier 43, a TR44 and a reference resisters R2 45 from an operational amplifier 37, a TR39 and a reference resistor R2 45 respectively and a current of (V1-V2)R4/(R1XR3) and a current of (V1-V2)R4/(R2 XR3) are outputted respectively from output terminals 41, 46 of the converters 35, 36.
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