Operational Amplifier Parameters
The value of VIO reflects the symmetry of the circuit and the potential matching in the manufacturing of the op amp. The larger the VIO value, the worse the symmetry of the circuit, which is generally about ± (1~10) mV.
When the bias current is
(1)
(2)
4. Temperature drift
.
(3)
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Figure 3
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The conversion rate is related to many factors, mainly the compensation capacitor added by the op amp, the inter-electrode capacitance and stray capacitance of each level of BJT of the op amp itself, and the charging current provided by the amplifier circuit. In the transient process of input large signals, the output voltage changes linearly with the input voltage only after the capacitance of the circuit is charged. It is usually required that the SR of the op amp is greater than the absolute value of the signal change slope.
, output voltage
. The maximum rate of change of the output voltage is
. The maximum rate of change of the output voltage is
(4)
SR≥2pfVom (5)
, when the output voltage amplitude Vom=10V, its maximum undistorted frequency should be 8kHz.
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