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AD6122ARS

CDMA 3 V Transmitter IF Subsystem with Integrated Voltage Regulator

Analog Devices 

NOISE

SOURCE

REACTIVE

1:8

CONJUGATE

MATCH

VREG OUT

PULL-UP INDUCTORS CHOSEN

FOR PEAK RESPONSE AT THE

TEST FREQUENCY.

0.1␮F

IFINP

TXOPP

453⍀

4:1

10nF

10nF

IFINN

TXOPN

AD6122

10nF 205⍀

10nF 453⍀

0.1␮F

VREG OUT

Figure 4. IF Amplifier’s Noise Figure Test Set

AD6122

TO NOISE

FILTER

METER

HP8116A

FUNCTION GEN.

4 kHz, 0.5V TO 2.5V

SQ. WAVE

ROHDE & SCHWARZ

SMT03

100MHz, –30dBm

HP8116A

FUNCTION GEN.

4kHz, 0V TO 2.7V

SQ. WAVE

ROHDE & SCHWARZ

SMT03

100kHz, –30dBm

AGC

IFIN

IFOUT

AD6122 TEST BED

TEKTRONIX TDS 744A

CH 1 WITH X10 PROBE

CH 2 WITH COAX CABLE

50⍀

a. Response Time from Gain Control to IF Output

PD1,

IFIN

PD2

IFOUT

AD6122 TEST BED

TEKTRONIX TDS 744A

CH 1 WITH X10 PROBE

CH 2 WITH COAX CABLE

50⍀

b. Response Time from PD1 and PD2 Control to IF Output

Figure 5. Response Time Setup

REV. B

–7–

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