11525-801 데이터 시트보기 (PDF) - AMI Semiconductor
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11525-801 Datasheet PDF : 26 Pages
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April 1999
Note: inputs are needed for highlighted equations (with yellow background color).
Read in the modulation profile:
(Use the .prn file name as the argument of the READPRN function. The file names of the three example
modulation profiles are: lexmark.prn, triangle.prn, and sin.prn)
f READPRN( "lexmark.prn" ) .Hz
wavepoints rows( f)
F carrier mean( f)
δ max( f) min( f)
max( f)
mi if fi min( f) , i, 1
fm
F carrier
max( m) max( n ) .2
i 0.. wavepoints 1
F carrier = 99.75 MHz
δ = 0.5 %
ni if fi max( f) , i, 1
f m = 31.17 KHz
<--the center frequency of the clock
<--the spread amount
<--the modulation frequency
Input modulation amount (peak to peak in percentage, δ_mod)
δ_mod 0.5.%
f_mod
F carrier max( f) .δ
δ_mod
2
f
F carrier
.δ_mod
δ
Display the profiles
1 108
9.99 107
9.98 107
9.96 107
9.95 107
9.94 107
0
Modulation Profile
1000
2000
3000
4000
5000
6000
7000
8000
9000
Build up a simulation. The general methodology that we will use here is:
Compute the phase of the source waveform (the one that is applied to the tracking PLL) at a series of points in time.
Iteratively compute the phase of the tracking PLL clock at successive points in the series, take the error between the two clocks
and adjust the frequency of the tracking PLL to suit. Note that the spacing of the points is regular. n an actual PLL, the correc-
tions to the loop are applied only on zero crossings of the signals. This deviation from actual practice can be demonstrated to
have a very small effect on the resulting performance of the loop (assuming that no cycle slips are occurring).
The simulation time step will be set to the average clock period: t step
1
F carrier
Set up the range variables for simulation: i 0.. ( wavepoints 1) i1 1.. ( wavepoints 1)
4.5.99
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