| 摘要 |
PURPOSE:To attain use of low power supply voltage without narrowing the dynamic range by designing the circuit so that one stage of the 1st stage differential pair, its load resistor and a constant current source decide a DC bias. CONSTITUTION:The load resistors 12, 13 are connected to the 1st stage differential pair 101, and the collector of a differential pair 102 of the next stage is connected to common with no load resistor connected and the differential pairs 101, 102 are connected respectively with the constant current sources 18, 19, then the DC bias of the titled multiplication circuit is decided by the load resistors 12, 13, the 1st stage differential pair 101 and the constant current sources with a value between a power supply voltage Vcc and a reference potential, and since the differential pair 102 of the next stage does not have any load resistor, there is a margin in the DC bias of the multiplication circuit. As a result, the dynamic range gas a margin and the power supply voltage is reduced corresponding to said margin.
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