ISSCC 2008 / SESSION 19 / PLLs & OSCILLATORS / 19 . 5 19 . 5 A 90 μ W 12 MHz Relaxation Oscillator with a – 162 dB FOM
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چکیده
Both ring oscillators and relaxation oscillators are subsets of RC oscillators featuring large tuning ranges and small areas. Figure 19.5.1 shows a typical relaxation oscillator with a capacitor and two switched current sources. Such relaxation oscillators have two advantages with respect to ring oscillators: 1) they have a constant frequency tuning gain; and 2) their phase can be read out continuously due to their triangular (or sawtooth) waveform. A major disadvantage of practical relaxation oscillators is their poor phase-noise compared to ring oscillators [1,2,4].
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تاریخ انتشار 2008