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A low-jitter and large-EMI-reduction spread spectrum clock generator (SSCG) for Serial-ATA (SATA) was developed. A low-jitter voltage-controlled oscillator (VCO) with a high-frequency limiter was developed to prevent the SSCG from malfunctioning. This VCO achieved far less jitter than that of a conventional VCO. An autocalibration technique suitable for this VCO was developed to prevent the SSCG from...
A serial ATA PHY was fabricated in a 0.15-mum CMOS process with a technique of calibrating a spread spectrum clock generator (SSCG). This technique involves calibrating the SSCG output signal frequency, which does not meet the serial-ATA specifications due to large variations in the reference oscillator, by utilizing the received signal during a power-on sequence. This is achieved by shifting the...
A low jitter voltage-controlled oscillator (VCO) with high-frequency-limiter and an auto-calibration technique suitable for this VCO was developed for a spread-spectrum clock generator (SSCG). The high-frequency-limiter prevents the SSCG from going into an unlocked state. The proposed VCO achieved far less jitter than a conventional one because a proposed structure has less operating MOSs. The auto-calibration...
A voltage-controlled oscillator (VCO) for optical-disc-drive (ODD) applications was developed. This VCO selects the most appropriate current-controlled oscillator (CCO) from three CCOs in order to satisfy various ODD read/write speeds. It produces the frequency characteristics of a maximum frequency limiter in order to prevent unlocking of a PLL. Moreover, the VCO applies a trimming method to correct...
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