hi my freind
please help me. you can help me with translate this text.
Thanks a lot for your help.
care must be taken when using large feedback resistors since they interact with the input capacitance of the op amp to create poles with negative feedback,and both poles and zeros with positive feedback.large resistor values can move these poles and zeros into the proximity of the oscillation frequency and impact the phase shift.
A final consideration is given to the slew-rate limtation of the op amp . the slew-rate must be greater than 2 where vp is the peak output voltage and f0 is the oscillation frequency,or distortion of the output signal will result.
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the gain of the negative feedback path is combined into one gain term(representing the closed loop gain) and figure 15-5 reduces to figure 15-1.the positive feedback network is then represented by b=b2 and subsequent analysis is simplified.when negative feedback is used,then the positive feedback loop can be ignored since b2 is 0.
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op amp = تقويت كننده عملياتي
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