| 摘要 |
A linear amplifier in an automatic gain control circuit whose gain is a function of the ratio of two bias currents is obtained by selectively coupling two pairs of semiconductor devices such that the effects of nonlinearities due to the logarithmic relationship between voltage and current across a PN junction cancel. The relationship between the two pairs of devices is such that the output signal from the second pair of devices is linearly related to the input signal driving the first pair of devices.
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