PMB2110 データシートの表示（PDF） - Infineon Technologies

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PMB2110

GSM Dualband TX VCO

Infineon Technologies 

3

Application

3.1

Application Circuit

PMB 2110

Version 1.1

Application

CPTX

PMB6250 100p

PMB6253

150R

8.2n

180R

100p

VTUNE

VCO

PMB2110

1k8

220p

1k8

1k8

220p

1k8

I

SMARTi:

GSM: Icp=0.5mA Kvco=90MHz/V ±15MHz/V

IX

PMB6250 DCS: Icp=0.5mA Kvco=92MHz/V ±19MHz/V

Q PMB6253

QX

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

s DC blocking capacitors must be used at each RF output.

s 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.

s Loop filter precharge function must be enabled together with PMB6250/PMB6253.

Specification

13

2001-07-30

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