A Spread Spectrum Clock Generator for SATA II with Rounded Hershey-Kiss Modulation Profile
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초록
A spread spectrum clock generation is an efficient way to reduce electro-magnetic interference (EMI) radiation in modern mixed signal chip systems. The proposed circuit generates the spread spectrum clock by directly injecting the modulation voltage into the voltage-controlled oscillator (VCO) current source for SATA II. The resulting 33KHz modulation profile has a Hersey-Kiss shape with a rounded peak. The chip has been fabricated using 0.18㎛ CMOS process and test results show that the proposed circuit achieves 0.509% (5090ppm) down spreading at 1.5GHz and peak power reduction of 10㏈. The active chip area is 0.36㎜ × 0.49㎜ and the chip consumes 30㎽ power at 1.5GHz.
Abstract
A spread spectrum clock generation is an efficient way to reduce electro-magnetic interference (EMI) radiation in modern mixed signal chip systems. The proposed circuit generates the spread spectrum clock by directly injecting the modulation voltage into the voltage-controlled oscillator (VCO) current source for SATA II. The resulting 33KHz modulation profile has a Hersey-Kiss shape with a rounded peak. The chip has been fabricated using 0.18㎛ CMOS process and test results show that the proposed circuit achieves 0.509% (5090ppm) down spreading at 1.5GHz and peak power reduction of 10㏈. The active chip area is 0.36㎜ × 0.49㎜ and the chip consumes 30㎽ power at 1.5GHz.
참고문헌 (9)
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