ADF4112 AD [Analog Devices], ADF4112 Datasheet - Page 18

• Manufacturer Part Number: ADF4112
• Description: 300 MHz to 1000 MHz Quadrature Modulator
• Manufacturer: AD [Analog Devices]

ADL5370
The setup used to evaluate baseband frequency sweep and
undesired sideband nulling of the ADL5370 is shown in Figure 39.
The interface board has circuitry that converts the single-ended
I and Q inputs from the arbitrary function generator to differ-
ential 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 39. 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
I IN DCCM
AGND
90°
CIRCUIT BOARD
I IN AC
VPOSB VPOSA
Rev. 0 | Page 18 of 20
TSEN
VN1
IN1
Q IN AC
GND
VP1
IN1
FREQ 4MHz TO 4GHz
QN
QP
LEVEL 0dBm
IN
IP
Undesired sideband nulling was achieved through an iterative
process of adjusting amplitude and phase on the Q channel.
See Sideband Suppression Optimization in the Optimization
section for a more detailed discussion on sideband nulling.
SIGNAL GENERATOR
R AND S SMT 06
IP
IN
QP
QN
VPOS
CHAR BD
FMOD
SPECTRUM ANALYZER
R AND S FSEA 30
100MHz TO 4GHz
OUT
GND
LO
+6dBm
OUT
RF
IN
RF
OUTPUT
LO