adl5372 Analog Devices, Inc., adl5372 Datasheet - Page 20

• Manufacturer Part Number: adl5372
• Description: 1500 Mhz To 2500 Mhz Quadrature Modulator
• Manufacturer: Analog Devices, Inc.

ADL5372
The setup used to evaluate baseband frequency sweep and
undesired sideband nulling of the ADL5372 is shown in Figure 42.
The interface board has circuitry that converts the single-ended
I input and Q input from the arbitrary function generator to
differential I and Q baseband signals with a dc bias of 500 mV.
ARBITRARY FUNCTION GENERATOR
0.500
VPOS +5V
5.000
CH1
CH2
0.200 ADC
AGILENT 34401A
AGILENT E3631A
POWER SUPPLY
MULTIMETER
+
AGILENT E3631A
POWER SUPPLY
+
6V
VCM = 0.5V
TEKTRONIX AFG3252
1MHz
AMPL 700mV p-p
PHASE 0°
1MHz
AMPL 700mV p-p
PHASE 90°
6V
VPOS +5V
–
DUAL FUNCTION
–
0.010A
0.350A
Figure 42. Setup for Baseband Frequency Sweep and Undesired Sideband Nulling
+
+
0°
COM
±25V
+5V
COM
±25V
–
–
–5V
I Q
FMOD TEST RACK
SINGLE TO DIFFERENTIAL
Q IN DCCM
AGND
I IN DCCM
90°
CIRCUIT BOARD
I IN AC
VPOSB VPOSA
TSEN
VN1
Rev. 0 | Page 20 of 24
IN1
Q IN AC
GND
VP1
IN1
FREQ 4MHz TO 4GHz
QP
QN
LEVEL 0dBm
IP
IN
Undesired sideband nulling was achieved through an iterative
process of adjusting amplitude and phase on the Q-channel. See
Sideband Suppression Optimization section for a detailed
discussion on sideband nulling.
SIGNAL GENERATOR
R AND S SMT 06
IP
IN
QP
QN
CHAR BD
VPOS
FMOD
SPECTRUM ANALYZER
R AND S FSEA 30
100MHz TO 4GHz
OUT
GND
LO
+6dBm
OUT
RF
RF
IN
OUTPUT
LO