| 摘要 |
PURPOSE:To improve the open loop gain and the frequency characteristic by inserting a frequency compensation capacitor between input terminals and also connecting a feedback capacitor in parallel with a feedback impedance. CONSTITUTION:The frequency compensation capacitor 11 is connected between the input terminals of the operational amplifier A. Further, the feedback capacitor 10 is connected in parallel with the feedback impedance 2. Thus, the Bode diagram with respect to the input/output is shown in caption 13. The open loop gain and frequency characteristic, that is, a slope at 0dB crossover point, is improved gently as shown in characteristic B from a conventional characteristic A even if stray capacitance exists at the output 6 by selecting properly the value of the feedback capacitor 10 and the frequency compensation capacitor 11. Thus, the amplifier with high stability and oscillation prevention is obtained.
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