RF9678PCBA datasheet(8/16 Pages) RFMD

8 / 16 page

Preliminary

5-98

RF9678

Rev A4 010622

Procedure for RF9678 Quadrature Modulator/AGC Optimization

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

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@ 500 mVp, 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.

HP6624A or Equiv

DC Power Supply

Output 3

(VGC)

HPE4422B or Equiv

Analog Signal

Generator

(LO)

HP8904 or Equiv

Multifunction Signal

Generator

(Sine, I+ and Q+)

HP66332A or Equiv

DC Power Supply

(VCC, PD)

Rhode and

Schwartz FSIQ7 or

Equiv, Spectrum

Analyzer

9678410

MOD

OUT

Q-

I-

I+

Q+

VGC

VCC

HP6624A or Equiv

DC Power Supply

Outputs 1 and 2

(VREF)

Figure 5. RF9678 Test Setup

SWT

2 s

Unit

dBm

1RM

Ref Lvl

15 dBm

Ref Lvl

15 dBm

RF Att

40 dB

32.5 kHz/

Center 380 MHz

Span 325 kHz

EXT

RBW

5 kHz

VBW

50 kHz

-80

-70

-60

-50

-40

-30

-20

-10

Date:

6.FEB.2001

00:54:00

Figure 6. Unassigned Single Sideband Output

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