| 摘要 |
A circuit and method for controlling current gain in variable gain and automatic gain control amplifiers or attenuators in high frequency communication systems. A transistor through which the current is provided always operates at the same DC bias, independent of gain control variations. The input signal is provided to a base of the transistor whose collector provides an output current whose gain is to be controlled. An AGC current for adjusting the output current gain and a DC bias current are provided to the base of the transistor through a multi-transistor circuit so that the DC bias is independent of variation of the output current gain.
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