BGX7100 データシートの表示（PDF） - NXP Semiconductors.

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BGX7100

Transmitter IQ modulator

NXP Semiconductors. 

NXP Semiconductors

12. Application information

BGX7100

Transmitter IQ modulator

100 nF

VCC

22 pF

modulator in-phase

positive input

modulator in-phase

negative input

24

POFF_P

1

LO input

1

5

O PRIMARY O

TC1-1-43A+

3

4

LOGND 2

18 pF LO_P 3

0.3 pF

LO_N 4

18 pF

LOGND

5

LOGND

6

7

23

22

21

20

19

VCC_RF(5V0)

18

VCC

BGX7100

RFGND

17

22 pF

100 nF

0°

90°

8

9

10

16 RFOUT

39 pF

RFOUTPUT

0.4 pF

15 i.c.

14 RFGND

13 i.c.

11

12

modulator quadrature

negative input

modulator quadrature

positive input

Fig 4. Typical wideband application diagram

aaa-002965

Figure 4 shows a typical wideband (from 0.4 GHz to 4 GHz) application circuit. Refer to

the application note for narrowband optimum component values.

12.1 External DAC interfacing

Nominal DAC single-ended output currents are between 0 mA and 20 mA.

If the DAC outputs are only designed for 1 V peak-to-peak differential (250 mV

peak-single) then the single-ended impedance at the DAC needs to be limited to 25 .

This can be split as 50  load resistors at the DAC outputs and a 225  differential

resistor in parallel to the modulator inputs (see Figure 5). In this way, the differential filter

can be properly terminated by 100  at both ends.

If the DAC outputs can withstand a higher swing without performance degradation, then

90  load resistors can be placed at the DAC outputs. No external resistors are needed in

this case, only the differential filter needs to be designed to have 180  at both ends (see

Figure 6).

BGX7100

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 5 — 3 September 2012

© NXP B.V. 2012. All rights reserved.

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