Op Amp And Two JFETs Form A Voltage-Controlled Amplifier

  
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A simple linear voltage-controlled amplifier can be constructed with one op amp and two JFETs (see the figure). The amplifier can achieve an 80-dB dynamic control range with less than ±0.2% linearity error for 0 V .
Op Amp And Two JFETs Form A Voltage-Controlled Amplifier - schematic




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