iam-91563 Avago Technologies, iam-91563 Datasheet - Page 12

• Manufacturer Part Number: iam-91563
• Description: 0.8?6 Ghz 3v Downconverter
• Manufacturer: Avago Technologies

Table 1 below summarizes the component values for
the 1.9 GHz design.
Table 1. Component Values for 1.9 GHz Downconverter.
The values shown in Table 1 may vary from those used
above to describe the basic impedance matching ap-
proach. The final component values take into consider-
ation additional effects such as, the various line lengths
between components, parasitics in components (e.g.,
the series inductance in C1), as well as other circuit
parasitics. A CAD program such as Avago Touchstone
may be used to fully analyze and account for these
circuit variables.
Figure 32. Complete 1.9 GHz Mixer.
Component
C3, C5, C7
MLIN
RFC
C1
C2
C4
L1
L2
L3
RF
IAM-91
LO
L 1
C 1
C 7
L3
(not used)
l = 0.41 in.
Z
100 nH
320 nH
100 pF
500 pF
8.2 nH
o
Value
0.5 pF
MUN 1
9 pF
=90 Ω
C3
C2
C6
L2
C5
RFC
C4
+V
IF
®
The following performance was measured for a 1.9
GHz circuit:
Measured results:
Conversion Gain = 9.0 dB
SSB Noise Figure = 8.5 dB
P
IP
Operating conditions:
RF Frequency = 1.89 GHz
LO Frequency = 1.78 GHz
IF Frequency = 110 MHz
Designs for Other Frequencies
The same design methodology described above can be
applied to other wireless frequency bands. Design
examples and measurement results for the 900 MHz
and 2.4 GHz bands are shown in Figures 33 and 34.
Measured results:
Conversion Gain = 10.6 dB
SSB Noise Figure = 7.1 dB
1 dB Compression = -7.0 dB
P3 (Input) = -7 dBm
Operating conditions:
RF Frequency = 900 MHz
IF Frequency = 80 MHz
LO Frequency = 980 MHz
Figure 33. 800-900 MHz Cellular and ISM Band Mixer.
MHz
250
1dB
IF
Vd
3
(Input) = -7 dBm
(output) = -8.1 dB
50 Ω
220 nH
1000 pF
180 nH
12
100 pF
220 pF
GC
GN
15 pF
IF
LO Drive Level = -5 dBm
DC Power = 3.0V @ 9 mA
LO-RF Isolation = 21 dB
LO-IF Isolation = 33 dB
RF-IF Isolation = 17 dB
LO Drive Level = -5 dBm
DC Power = 3.0V @ 9 mA
LO-RF Isolation = 17 dB
LO-IF Isolation = 34 dB
RF-IF Isolation = 23 dB
GND
RF
LO
0.9 pF
10 nH
50 Ω
50 Ω
2450
2200
MHz
MHz
RF
LO