A programmable MEMS-based clock generator with sub-ps jitter performance
2011
A MEMS-based clock generator achieves sub-ps jitter in 0.18um CMOS. Key enabling techniques include a 48MHz MEMS oscillator, a reference doubler, a linear XOR-based PFD, a switched-resistor loop filter using accumulation mode NMOS varactors, and native NMOS devices with an RC filter. The overall output at 156.25MHz achieves an integrated phase jitter of 668fs rms over an integration bandwidth of 10kHz–20MHz.
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