| 摘要 |
A variable gain amplifier (VGA) may be useful in applications where the input amplitude is constant but the output must vary over a wide range. Some VGAs have a desirable exponential control characteristic, but an undesirable temperature characteristic that causes the gain to change with temperature when the control voltage is held constant with respect to temperature. The present invention is directed to a circuit that will convert a control signal (e.g., a voltage) that is constant with temperature into a voltage that can be applied to a VGA in such a way that the temperature variation of the VGA is eliminated without changing the desirable exponential control characteristics.
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