Record number :
100078
Title of article :
Design of CMOS adaptive-bandwidth PLL/DLLs: a general approach
Author/Authors :
Wei، Gu-Yeon نويسنده , , Kim، Jaeha نويسنده , , M.A.، Horowitz, نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
Pages :
-85
From page :
86
To page :
0
Abstract :
A phase-locked loop (PLL) and delay-locked loop (DLL) design with adaptively adjusting bandwidth enables optimal performance over a wide frequency range and across process, voltage, and temperature variations. A design methodology of such adaptive-bandwidth PLLs and DLLs is described. To assess the impact of each circuit parameter directly, we derive a discrete-time, open-loop dynamic model of the PLL/DLL that characterizes the change in output variables in response to the sampled error and we express the adaptive-bandwidth criteria in terms of the open-loop gains, instead of the traditional closed-loop parameters, (omega)/sub n/ and (zeta). Applying these criteria, we derive scaling equations for the charge-pump current and filter resistance that achieve adaptive bandwidth in charge-pump PLL/DLLs. We show that previously published adaptive-bandwidth PLL/DLLs, a self-biased PLL/DLL and a regulated-supply PLL/DLL, rely on the small-signal conductance tracking the large-signal conductance of the voltage-controlled oscillator/voltage-controlled delay-line and, thus, sustain constant (omega)/sub n//(omega)/sub ref/ and (zeta) only if the voltage swing is sufficiently higher than the device threshold voltage V/sub TH/. The paper also presents procedures to estimate the open-loop parameters from an open-loop impulse response of the PLL/DLL.
Keywords :
Abdominal obesity , Food patterns , Prospective study , waist circumference
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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