| IP명 | 초기위상오차에 강인한 AFC와 링 발진기를 포함한 주파수 합성기 | ||
|---|---|---|---|
| Category | Mixed | Application | Frequency synthesizer |
| 실설계면적 | 2㎛ X 2㎛ | 공급 전압 | 1V |
| IP유형 | Hard IP | 동작속도 | 1GHz |
| 검증단계 | Silicon | 참여공정 | HM-2402 |
| IP개요 | An automatic frequency calibration robust to initial phase error and a phase-noise-enhanced ring oscillator are proposed for frequency synthesizers. The proposed automatic frequency calibration method can quickly determine the desired sub-band tuning curve for a voltage controlled oscillator by detecting the overshoot voltage of the oscillator control voltage of the frequency synthesizer when an initial phase error occurs between the reference signal and the divided output signal from the oscillator, thereby reducing the locking time of the frequency synthesizer. The proposed ring oscillator uses a differential inverter type delay cell with an input AC-coupled current source for phase noise improvement and low power consumption. For verification, an integer-N frequency synthesizer with the proposed automatic frequency calibration and ring oscillator was fabricated using 65-nm CMOS technology. |
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- 레이아웃 사진 -
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