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參數資料
| 型號： | LUCW3000CCN |
| 英文描述： | W3000 PLL Dual-Band Frequency Synthesizer |
| 中文描述： | W3000鎖相環(huán)雙頻段頻率合成器 |
| 文件頁數： | 19/28頁 |
| 文件大?。?/td> | 327K |
| 代理商： | LUCW3000CCN |
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Advance Data Sheet
December 1999
W3000 PLL Dual-Band Frequency Synthesizer
Lucent Technologies Inc.
19
Application Information
A typical PLL system can be modeled as follows:
+
K
PD
Z(s)
K
VCO
s
1/N
f
REF
1/R
f
VCO
Figure 11. Typical PLL Model
K
PD
=
Phase detector in mA/2
π
rad
Z(s) = Loop filter
K
VCO
= VCO gain in MHz/V
N
= Total divide ratio
R
= Reference divide ratio
Where the open loop gain is:
G(s)
OPEN
=
Ns
Kvco
*
)
Z
*
K
PD
Where
s = j
ω
The circuit shown in Figure 12 uses a passive third-order loop filter for the element Z(s), defined by the network:
C1
R1
C3
R2
C2
CHARGE PUMP
OUTPUT
VCO
Figure 12. Third-Order Loop Filter
The purpose of the loop filter is to provide response with bandwidth sufficient not only to allow a quick lock time
but also to meet phase-noise and reference sideband requirements. Addition of a third pole formed by R2 and C3
will improve reference sideband performance with little overall impact on the loop performance. A reasonable
practical limit is that the f comparison is greater than 5 times loop bandwidth.
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| LUCW3000CCN-TR | W3000 PLL Dual-Band Frequency Synthesizer |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LUCW3000CCN-TR | 制造商:AGERE 制造商全稱:AGERE 功能描述:W3000 PLL Dual-Band Frequency Synthesizer |
| LUCW3011FCL | 制造商:AGERE 制造商全稱:AGERE 功能描述:1 GHz Quadrature Modulator |
| LUCW3020CCS | 制造商:AGERE 制造商全稱:AGERE 功能描述:GSM Multiband RF Transceiver |
| LUCW3020CCS-DB | 制造商:AGERE 制造商全稱:AGERE 功能描述:GSM Multiband RF Transceiver |
| LUCW3030ACA | 制造商:AGERE 制造商全稱:AGERE 功能描述:W3030 3 V Dual-Mode IF Cellular Receiver |
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