May 2020
Intermediate to advanced
286 pages
7h 15m
English
Content preview from CMOS Analog and Mixed-Signal Circuit Design
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9 |
Peripheral Circuits |
9.1 INTRODUCTION
Knowledge of the oscillator and interface circuitry is important for a complete custom analog and mixed-signal integrated circuits. The oscillator can be used in more advanced oscillatory, such as phase-locked loop. However, the phase-locked loop is normally required for a very accurate source requirement. A basic built-in oscillator is normally sufficient for standalone analog or mixed-signal integrated circuits. The control clock is basically generated from the controller or master controller integrated circuit (IC).
9.2 OSCILLATOR
9.2.1 RING OSCILLATOR
Figure 9.1 shows a current-starved ring oscillator. The oscillation frequency of a basic ring oscillator is:
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