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HDM8513 Datasheet(PDF) 59 Page - Hynix Semiconductor

No. de pieza HDM8513
Descripción Electrónicos  DVB/DSS Compliant Receiver
PDF  67 Pages
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Fabricante Electrónico  HYNIX [Hynix Semiconductor]
Página de inicio  http://www.skhynix.com/kor/main.do
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HDM8513 Datasheet(HTML) 59 Page - Hynix Semiconductor

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59
A1. Loop Filter Programming Application Note
To illustrate that the symbol timing recovery loop and the carrier phase recovery loop are both
programmable, several simulations were performed with different loop parameter conditions. These
simulations were performed with a symbol rate of two samples per symbol, corresponding to 30M
symbols-per-second if a 60MHz clock were utilized.
Figure A1 illustrates the transient response of the symbol phase with three different loop conditions
(K1=5, K2=10; K1=4, K2=9; and K1=8, K2=7). The vertical scale represents phase over a 360
degree range (524,287 to -524,288). All test cases were run at high signal -to-noise ratio. The
highest gain condition could be used for fast acquisition as well as for steady state with high code
rate conditions, while the intermediate gain is a suitable steady state setting for rate 1/2 codes
(minimum Eb/N0 of 4 dB). The lowest gain setting corresponds to ultra low loop bandwidth and
may be considered for maintaining lock without phase jumps during deep signal fades.
FIGURE A1: SYMBOL TIMING RECOVERY TRANSIENT RESPONSE



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