RF9678 데이터 시트보기 (PDF) - RF Micro Devices

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RF9678

W-CDMA TRANSMIT MODULATOR AND IF AGC

RF Micro Devices 

RF9678

Procedure for RF9678 Quadrature Modulator/AGC Optimization

1) Configure the test bench as shown in Figure 5.

HPE4422B or Equiv

Analog Signal

Generator

(LO)

Preliminary

HP66332A or Equiv

DC Power Supply

(VCC, PD)

LO

Q-

Q+

VCC 9678410

PD

I-

HP8904 or Equiv

Multifunction Signal

Generator

(Sine, I+ and Q+)

MOD

I+

VGC OUT

HP6624A or Equiv

DC Power Supply

Outputs 1 and 2

5

(VREF)

HP6624A or Equiv

DC Power Supply

Output 3

(VGC)

Rhode and

Schwartz FSIQ7 or

Equiv, Spectrum

Analyzer

Figure 5. RF9678 Test Setup

2) Apply VCC to the part. (VCC=3.0V)

3) Set gain control to maximum. (VGC=2.4V)

4) Apply the LO signal. (760MHz@-5dBm, for an IF out of 380MHz)

5) Apply the I+ and Q+ signals: (Single Ended)

I Signal: 150kHz@ 500mVp, Phase=0°, 1.3V DC Offset

Q signal: 150kHz@ 500mVp, Phase =90°, 1.3V DC Offset

6) Set the DC levels at ISIG- and QSIG- input pins to the nominal value (1.3V). The output spectrum should look similar to

Figure 6.

Ref Lvl

15 dBm

10

0

RBW

5 kHz RF Att 40 dB

VBW 50 kHz

SWT

2s

Unit

dBm

A

-10

-20

1RM

-30

EXT

-40

-50

-60

-70

-80

Center 380 MHz

Date:

6.FEB.2001 00:54:00

32.5 kHz/

Span 325 kHz

Figure 6. Unassigned Single Sideband Output

5-98

Rev A4 010622

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