演算器方式による新型トランジスタ式掛算器

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This device was recently developed by the authors, varying the ratio R_f/R_i in the characteristic equation of operational amplifier e_0 = -(R_f/R_I) e_I, ; e_I and e_0 are the input and the output signals of the amplifier respectively. By this means, an analog multiplier can be constructed at a low cost, which gives an equally high accuracy over the wide range of frequency from DC to high frequencies. A multiplier circuit of this type using vacuum tubes has teen reported elsewhere.^<(1)> It was originally designed and used for an ultra-high speed analog computer^<(2)> utilized for simulating the human vocal tract. The transisterization of this circuit is not so difficult ; a principle diagram is given in Fig. 2. There is no essential difference between the vacuum tube and the transister circuit. Attention must be paid, however, to the fact that the base and the emitter current in a transister circuit are not independent of each other and that an error might be larger. The principle we adopted lies in obtaining the collector current proportional to the product of the base signal x and the emitter signal y. Thus, the collector current should be zero, if x = 0. The base signal, however, is proportional to the emitter signal y and the collector current is proportional to y^2, so that the error incurred may appreciably be greater. In the same way, when y = 0, then the collector current is proportional to x^2. Figs. 5 and 6 show the deviation from zero of the multiplier output in respective case. The difficulty can be removed by applying compensating circuits to both the emitter and the base, as illustrated in Fig. 8. The results obtained by this method are shown in Figs. 7 (a) and 7 (b).
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演算器方式による新型トランジスタ式掛算器

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