| 摘要 |
PURPOSE: An amplifier of controlling liner gain is provided to control the linear gain of the input signal obtained by a compensation voltage of a gain compensation unit and a load resistance and to control the linear range of each amplification unit with the same phase voltage of the previous stage. CONSTITUTION: In the amplifier of controlling linear gain, a gain compensation unit(100) produces a gain compensation voltage(Vctrl) having a semi-exponential characteristic. A variable gain amplification unit(200) produces a constant first output(OUT1) by controlling the linear gain of an input signal(IN). A fixed amplification unit(300) produces the second output(OUT2) by amplifying the first output(OUT1) of the variable gain amplification unit(200) and produces the third same phase voltage(vcmd) to deliver the charge of DC voltage.
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