Record number :
100076
Title of article :
A fractional- N frequency synthesizer architecture utilizing a mismatch compensated PFD/DAC structure for reduced quantization-induced phase noise
Author/Authors :
S.E.، Meninger, نويسنده , , M.H.، Perrott, نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
Pages :
-838
From page :
839
To page :
0
Abstract :
Techniques are proposed to dramatically reduce the impact of quantization noise in (sigma)(delta) fractional-N synthesizers, thereby improving the existing tradeoff between phase noise and bandwidth that exists in these systems. The key innovation is the introduction of new techniques to overcome nonidealities in a phase-frequency detector (PFD)/digital-to-analog converter (DAC) structure, which combines the functionality of both phase detector and cancellation DAC into a single element. The proposed architecture achieves better gain matching between the phase-error signal and cancellation DAC than offered by previous approaches. Dynamic element matching techniques are introduced to mitigate the effects of PFD/DAC unit element and timing mismatch on synthesizer phase noise performance. We present behavioral simulations of an example application of this technique that demonstrates 36 dB reduction in broad-band quantization-induced phase noise with the use of a 7-b PFD/DAC. Simulations further demonstrate that fractional spurs are rejected to levels <-90 dBc when a low-cost, low-overhead digital gain correction technique is employed.
Keywords :
Abdominal obesity , Food patterns , waist circumference , Prospective study
Journal title :
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II:ANALOG AND DIGITAL SIGNAL PROCESSING
Journal title :
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II:ANALOG AND DIGITAL SIGNAL PROCESSING
Serial Year :
2003
Link To Document :
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