neoflash
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Mixed-Signal Designer
Posts: 397
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I am thinking about what we trade off between 3 stages and 4 stages of RCO. I am talking about simplest ring oscillator with P-mos triode resistor tuned by bias current.
1. max frequency: 3-stage can achieve higher frequency. 2. noise: 3-stage should be less noisy due to less device. 3. Gain: 3 stage need more DC gain.
I do see several papers and designs used 4 stage RCO, any reason we use that?
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