HA17301P Datasheet, PDF (5/14 Pages) Hitachi Semiconductor – Quad Operational Amplifier

HA17301P
Inverting Amplifier
There are three bias techniques for biasing the inverting amplifier, the single power supply bias technique,
the NV_BE bias technique, and the load voltage bias technique.
1. Single Power Supply Bias Technique
Figure 2 shows a common AC amplifier that is biased by the same power supply as the supply that
operates the amplifier.
R₂
Cin
0.1 µF
Vin
500 k
R₁
50 kΩ ^V_D^{− −}
V_D+
I⁺
+
R₃ = 2R₂
1 MΩ
V⁺
Vout
Vout _{= −} R₂
Vin
R₁
Figure 2 Single Power Supply Bias Technique
(1)
2. NV_BE Bias Technique
R₂
I^−
Cin R₁
V_RE
0.1 µF 100 kΩ _I
1 MΩ
−
Vin
R₃ ^{82 kΩ} ₊
Vout
Figure 3 NV_BE Bias Technique
This is the most useful application of an inverting AC amplifier. In this circuit, the input bias voltage
V_BE for the inverting input is determined by the current that flows to ground through the resistor R₃.
Vout _{= −} R₂
Vin
R₁
(2)
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