| 摘要 |
PCT No. PCT/JP91/00219 Sec. 371 Date Oct. 15, 1992 Sec. 102(e) Date Oct. 15, 1992 PCT Filed Feb. 21, 1991 PCT Pub. No. WO91/13491 PCT Pub. Date Sep. 5, 1991.The present invention concerns a current amplifier which is formed by a transistor, with a view to preventing oversaturation of the transistor. The transistor saturation preventing circuit, according to the invention, includes a second transistor (Q2) which constitutes a current mirror circuit with respect to a first transistor (Q1) forming the current amplifier, a saturation detecting element (R1) connected to the second transistor (Q2) to detect saturation of the first transistor (Q1), and a current feedback element (D1), so as to decrease the base current of the first transistor (Q1).
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