Tuning in ring oscillator
时间：04-04
整理：3721RD
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For the attached schematic:
1) Why M3 and M4 enter saturation, each stage then requires common-mode feedback to produce the output swings around a well-defined CM level ?
2) With complete switching, each stage provides a differential output swing of 2Iss Ron 3,4 . Thus, a tuning range of, say, two to one translates to a twofold variation in the swing.
==> Could anyone explain how to obtain the expression for the differential output swing ? And What does it mean by twofold variation ?
1) Why M3 and M4 enter saturation, each stage then requires common-mode feedback to produce the output swings around a well-defined CM level ?
2) With complete switching, each stage provides a differential output swing of 2Iss Ron 3,4 . Thus, a tuning range of, say, two to one translates to a twofold variation in the swing.
==> Could anyone explain how to obtain the expression for the differential output swing ? And What does it mean by twofold variation ?
