Datasheet

Technical Note
46/48
BA4558F,BA4558R F/FV/FVM,BA4560F,BA4560RF/FV/FVM,BA4564RFVBA4580RF/FVM,BA4584FV,
BA4584RF/FV,BA8522RF/FV/FVM,BA15218F,BA14741F,BA15532F,BA4510F/FV,BA2115F/FVM
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2011.08 - Rev.B
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○Voltage follower
○Inverting amplifier
○Non-inverting amplifier
Fig. 323 Voltage follower circuit
Fig. 324 Inverting amplifier circuit
Fig. 325 Non-inverting amplifier circuit
Voltage gain is 0 [dB].
This circuit controls output voltage (Vout) equal input
voltage (Vin), and keeps Vout with stable because of
high input impedance and low output impedance.
Vout is shown next formula.
Vout=Vin
For inverting amplifier, Vi(b) Derating curve
voltage gain decided R1 and R2, and phase reversed
voltage is outputted.
Vout is shown next formula.
Vout=-(R2/R1)・Vin
Input impedance is R1.
For non-inverting amplifier, Vin is amplified by voltage
gain decided R1 and R2, and phase is same with Vin.
Vout is shown next formula.
Vout=(1 + R2/R1)・Vin
This circuit realizes high input impedance because
Input impedance is operational amplifier’s input
Impedance.
VSS
Vout
Vin
VDD
R2
R1
VSS
R1//R2
Vin
Vout
VDD
VSS
R2
VDD
Vin
Vout
R1