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最近,模拟乘法器的微型组件正在大量出售,但精度大多不高,只达最大电压的1％。由于晶体管耦合部的电压──电流特性显示出极其精确的对数特性,利用这一特性,便能制作出动态范围广精度高的模拟乘法器。 签1中A_1、A_2的电路为对数放大器。在θ_1-Q和θ_1-σ分别υ_1-υ_2对数化的同时,补偿各自的温度特性。A_2构成“毫兰“电路,其输出端电压为θ_1-b的集电极电位的(1+n_1)倍。θ_1-b的集电极电流由υ_2/R_3确定,不受θ_1-b
Recently, the miniature components of analog multipliers are being sold in large quantities, but most of them are not accurate, only up to 1% of the maximum voltage. Since the voltage-current characteristic of the transistor coupling section shows an extremely accurate logarithmic characteristic, it is possible to produce an analog multiplier with a wide dynamic range and high accuracy by utilizing this characteristic. Sign in 1 A_1, A_2 circuit for the logarithmic amplifier. When θ_1-Q and θ_1-σ are respectively logarithmic υ_1-υ_2, their respective temperature characteristics are compensated. A_2 constitutes a “milliamp” circuit whose output voltage is (1 + n_1) times the collector potential of θ_1-b. The collector current of θ_1-b is determined by υ_2 / R_3, not by θ_1-b