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In his chapter on oscillator design, Razavi discusses the issue of latch-up and proposes several methods to eliminate it. However, he doesn't provide explanations for these methods. Could anyone provide insights into the following three questions?

1:Why does providing negative feedback near zero frequency in Figure 15.6 eliminate the problem of latch-up?

2:Why must the total number of inversions in the loop of ring oscillators be odd to prevent latch-up?

3:Is there a common principle underlying both the first and second methods?

Fig 15.6 15.6 Fig 15.15 15.15

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