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Openai/693690ea-2aec-8013-9f10-ddbe2ccd597e
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===== - UI ≈ 71.4 ps 기준 약 0.21 UI RMS jitter budget. ===== * Equalization 전략이 jitter에 주는 영향: - 패시브 최적화: 반사 감소 → deterministic jitter 감소 - CTLE: HF 노이즈/위상노이즈까지 증폭 → RJ 증가 가능 → “필요 최소 한도”로만 설정 - 과도한 TX pre-emphasis: overshoot/undershoot + ringing으로 추가 DJ 발생 - DFE: ISI 기반 DJ/vertical closure를 줄이지만, 불안정한 tap adaptation은 오히려 data-dependent jitter를 증가시킬 수 있음 * 따라서 jitter spec 맞추려면: - CTLE gain/zero/pole과 TX tap을 과하지 않게 설정하고 - DFE tap adaptation의 loop bandwidth를 너무 빠르게 잡지 않아 tap coefficient가 흔들리지 않게 설계
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