By Walt Kester
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These equations can be solved for C2: C2 = C1 . 2πR2 ⋅ f u 25 This value of C2 will yield a phase margin of about 45 degrees. Increasing the capacitor by a factor of 2 increases the phase margin to about 65 degrees (see References 4 and 5). In practice, the optimum value of C2 may be optimized experimentally by varying it slightly to optimize the output pulse response. 25. In this case, however, the low inverting input impedance, Ro, greatly reduces the sensitivity to input capacitance. In fact, an ideal CFB with zero input impedance would be totally insensitive to any amount of input capacitance!
Note that the intersection of the CFB current noise gain with the open-loop T(s) occurs where the slope of the T(s) function is 12dB/octave. This indicates instability and possible oscillation. It is for this reason that CFB op amps are not suitable in configurations which require capacitance in the feedback loop, such as simple active integrators or lowpass filters. 22 which do not require capacitance in the feedback network. 22 a VFB op amps, on the other hand, make very flexible active filters.
For G = –2, however, 5pF of additional inverting input capacitance causes only a small increase in bandwidth and no significant increase in peaking. High speed VFB op amps are sensitive to stray inverting input capacitance when used in either the inverting or non-inverting mode. 3 DRIVING CAPACITIVE LOADS From system and signal fidelity points of view, transmission line coupling between stages is best, and is described in some detail in the next section. However, complete transmission line system design may not always be possible or practical.
