| 摘要 |
PURPOSE:To obtain accurate display by detecting the current flowing through the emitter resistance of the complementary circuit of an output stage and the voltage of an output load resistance, and outputting the product of them. CONSTITUTION:The voltage across the emitter resistance RE1 is supplied to a differential amplifier A1 to detect the current flowing through the resistance RE1. The output of the differential amplifier A1 is supplied to a logarithmic amplifier A3 for logarithmic conversion. The voltage of an output load resistance RL is supplied to a logarithmic amplifier A2 to perform logarithmic conversion. The logarithmic conversion outputs of the logarithmic amplifiers A3 and A2 are summed up and the addition output is supplied to a reverse logarithmic amplifier A4, which outputs the product of the current and voltage. Consequently, accurate display is obtained regardless of variations of the load and even in a no-load state. |
