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Used for floating-point transform gain variable buffer ampli

2015-01-02 22:25  
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Used for floating-point transform gain variable buffer amplifier circuit
As shown in figure, the circuitis floating-point transform gain variable buffer amplifier circuit. The circuit consists of two parts: the buffer amplifier composedof OPA676 and theA/D conversion interface circuitcomposedof ADC603. OPA676 integrated chip's internal has two characteristics identical but independent differential amplification input levels. The two channels A and B can realize strobe by choosing pin 12's level. That is, when pins 12 is ata high level, channel A works, channel B cuts off; When pin 12 isat a low level, channel A cuts off, channel B works. The two channels' gains are different, using pin 12'scorresponding chose can realize gain's choice. We can learn from the diagram: Channel A voltage magnification is AVA=1+R2/R1=2; Channel B's voltage magnification is AvB=1+R4/R3=1+412/59=8.