| 摘要 |
PURPOSE:To facilitate digital analog conversion and to facilitate integration, by using an I<2>L gate circuit, which has a multi-collector transistor (TR), as a current source. CONSTITUTION:In an I<2>L gate circuit composed of TRs Q21 and Q22, when the base of the TRQ22 goes up to a level ''H'', application from a current source IIN is carried out. The TRQ22 has three collectors. An applied current flows, allowing a current IC to flow from the collector of the TRQ22. At this time, currents equal to the IC flow to other two collectors of the TRQ22, so a 2IC flows to a load R. For this purpose, the number of collectors is set in accordance with the weight of a digital value, so that a current which corresponds to the digital value flows to the load R. |
