參數(shù)資料
型號： LUCW3000CCN-TR
元件分類： PLL合成/DDS/VCOs
英文描述： PLL FREQUENCY SYNTHESIZER, 2200 MHz, PDSO14
封裝： TSSOP-14
文件頁數(shù)： 14/28頁
文件大小： 326K
代理商： LUCW3000CCN-TR
Advance Data Sheet
December 1999
W3000 PLL Dual-Band Frequency Synthesizer
Lucent Technologies Inc.
21
Application Information (continued)
For example, take a GSM application where a loop bandwidth of 22 kHz is required.
Other parameters specified by the system are listed below:
Parameter
Value
VCO Gain (KVCO)
88 MHz/V
Charge Pump Current (ICP)
2.5 mA
Divider Ratio (value of midband frequency used) (N)
7850
Required Phase Margin
45°
Reference Frequency Attenuation from Additional Pole
20 dB
Using the formulas above, the three time constants can be calculated as follows:
T1 = 2.63697E – 10
–6
s
T2 = 3.14484E – 10
–5
s
T3 = 2.38732E – 10
–6
s
From these values, we can derive the initial component values as follows:
R1 = 2992
C1 = 0.96 nF
C2 = 10.5 nF
If we choose R2 = 15 k
, then
C3 = 159 pF
From these initial values, the loop filter components used in the application circuit can be derived through
practical optimization.
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