Low-Phase-Noise All-Digital Frequency Synthesizer With a Time-Windowed TDC

shaweikang1984 · 发表于 2011-1-31 10:51:31

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Abstract
A 2.1-to-2.8-GHz low-power consumption all-digital
phase locked loop (ADPLL) with a time-windowed time-to-digital
converter (TDC) is presented. The time-windowed TDC uses
a two-step structure with an inverter- and a Vernier-delay timequantizer
to improve time resolution, which results in low phase
noise. Time-windowed operation is implemented in the TDC, in
which a single-shot pulse-based operation is used for low power
consumption. The test chip implemented in 90-nm CMOS technology
exhibits in-band phase noise of 105 dBc Hz, where the
loop-bandwidth is set to 500 kHz with a 40-MHz reference signal,
and out-band noise of 115 dBc Hz at a 1-MHz offset frequency.
The chip core occupies 0.37 mm􀀀 and the measured power consumption
is 8.1 mA from a 1.2-V power supply.

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