參數(shù)資料
型號: PMB2110
廠商: INFINEON TECHNOLOGIES AG
英文描述: GSM DUALBAND TX VCO
中文描述: 德克薩斯州GSM雙頻振蕩器
文件頁數(shù): 13/20頁
文件大?。?/td> 594K
代理商: PMB2110
PMB 2110
Version 1.1
Application
Specification
13
2001-07-30
3
Application
3.1
Application Circuit
Figure 3-1
Application Circuit
The TX Loopfilter is designed to get an optimum of RMS Phase error, 400kHz and
1800kHz suppression for GSM900/GSM1800. For more details please refer to separate
application note.
3.2
Hints
I
DC blocking capacitors must be used at each RF output.
Baseband Preemphase:
The combination of IQ filtering and phase filtering due to the upconversions loops
phase transfer function shows a partial cancellation of the correlated rms phase error
introduced by the different blocks. This effect is utilized in the application circuit pro-
posal. It leads to a phase error optimum for the recommended combination of loop
dynamics and IQ filtering.
Loop filter precharge function must be enabled together with PMB6250/PMB6253.
I
I
SMARTi:
GSM: Icp=0.5mA
Kvco=90MHz/V ±15MHz/V
DCS: Icp=0.5mA
Kvco=92MHz/V ±19MHz/V
I
IX
1k8
1k8
1k8
220p
Q
QX
220p
1k8
100p
8.2n
180R
150R
100p
VCO
PMB2110
PMB6250
PMB6253
CPTX
VTUNE
PMB6250
PMB6253
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