| 摘要 |
PURPOSE: To attain simple and effective temperature compensation without being influenced by the variation of a processing parameter by providing the converter with a uniform gain non-inverted interface circuit and a bipolar junction circuit element connected to a reference voltage circuit. CONSTITUTION: The combination of differential structures M3, M4 and current mirror structures M5, M6 constitutes an operational amplifier of which inverted input terminal and output terminal are respectively connected to the source and gate terminals of a transistor(TR) M2. The combination of the operational amplifier and the TR M2 can be regarded as a non-inverted interface circuit having uniform gain. Transistors Q1, M1 generate low impedance reference voltage equal to the value of reference voltage VREF and the base-emitter voltage of the Q1 on a point E. When an input current is changed, expotentially functional variation is generated in an output current by the voltage drop of a node B due to a resistor R. In the constitution, a temperature compensating means can be added without being influenced by a processing parameter. |
