ADL5350 Analog Devices, Inc., ADL5350 Datasheet - Page 19

• Manufacturer Part Number: ADL5350
• Description: Lf To 4 Ghz High Linearity Y-mixer
• Manufacturer: Analog Devices, Inc.

APPLICATIONS INFORMATION
LOW FREQUENCY APPLICATIONS
The ADL5350 can be used in low frequency applications. The
circuit in Figure 59 is designed for an RF of 136 MHz to 176 MHz
and an IF of 45 MHz using a high-side LO. The series and
parallel resonant circuits are tuned for 154 MHz, which is the
geometric mean of the wanted RF frequencies. The
performance of this circuit is depicted in Figure 60.
Preliminary Technical Data
Figure 59. RF of 136 MHz to 176 MHz Downconversion Schematic
30
25
20
15
10
5
0
136
Figure 60. Measured Performance for Circuit in Figure 59
ALL INDUCTORS
ARE 0603CS
SERIES FROM
COILCRAFT
RF
Using High-Side LO Injection and 45 MHz IF
IF
144
36nH
36nH
RF FREQUENCY (MHz)
27pF
152
RF/IF
RF/IF
8
1
10nF
IP1dB
IIP3
27pF
GND2
NC
ADL5350
7
2
160
4.7µF
LO
GAIN
VPOS
LOIN
3V
6
3
100nF
100nH
1nF
168
GND1
GND1
5
4
176
2
0
–2
–4
–6
–8
–10
Rev. PrE | Page 19 of 24
HIGH FREQUENCY APPLICATIONS
The ADL5350 can be used at extended frequencies with
some careful attention to board and component parasitics.
Figure 61 is an example of a 2530 MHz to 2630 MHz down-
conversion using a low-side LO. The performance of this circuit
is depicted in Figure 62. Note that the inductor and capacitor
values are very small, especially for the RF and IF ports. Above
2.5 GHz, it is necessary to consider alternate solutions to avoid
unreasonably small inductor and capacitor values.
The typical networks used for cellular applications below
2.6 GHz utilize band-select and band-reject networks on the RF
and IF ports. At higher RF frequencies, these networks are not
easily realized by using lumped element components (discrete
inductors and capacitors). As a result, it is necessary to consider
alternate filter network topologies to allow more reasonable
values of inductors and capacitors.
Figure 61. 2530 MHz to 2630 MHz RF Downconversion Schematic
35
30
25
20
15
10
5
0
2530
Figure 62. Measured Performance for Circuit in Figure 61
ALL INDUCTORS
ARE 0302CS
SERIES FROM
COILCRAFT
Using Low-Side LO Injection and 374 MHz IF
RF
IF
2550
0.67nH
1.5nH
RF FREQUENCY (MHz)
2570
1pF
RF/IF
RF/IF
8
1
IP1dB
GAIN
IIP3
1nF
0.7pF
GND2
2590
NC
ADL5350
7
2
4.7µF
3.0nH
LO
VPOS
LOIN
3V
6
3
100pF
2610
2.1nH
100pF
GND1
GND1
5
4
ADL5350
2630
–2
–3
–4
–5
–6
–7
–8
–9