| 摘要 |
A log circuit receives an operated current signal and a reference current signal at respective inputs and comprises an operand log circuit including a first bipolar semiconductor device and being configured to generate a first logarithmized signal on the basis of the operand current signal, a reference log circuit including a second bipolar semiconductor device and being configured to generate a second logarithmized signal on the basis of the reference current signal, and a differential-amplifier circuit receiving the first logarithmized signal and the second logarithmized signal, and outputting a differential-amplifier output signal in dependency on the first logarithmized signal and the second logarithmized signal. The differential amplifier is configured such that its amplification depends on a thermal voltage of a bipolar semiconductor device, so that at the output signal of the differential amplifier, the temperature dependency of the difference between the first logarithmized signal and the second logarithmized signal is counteracted.
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