lt5527euf-trpbf Linear Technology Corporation, lt5527euf-trpbf Datasheet - Page 14

• Manufacturer Part Number: lt5527euf-trpbf
• Description: 400mhz To 3.7ghz High Signal Level Downconverting Mixer
• Manufacturer: Linear Technology Corporation

APPLICATIO S I FOR ATIO
through matching inductors in a band-pass IF matching
network. The values of L1, L2 and C3 are calculated to
resonate at the desired IF frequency with a quality factor
that satisfies the required IF bandwidth. The L and C
values are then adjusted to account for the mixer’s
internal 2.5pF capacitance and the SAW filter’s input
capacitance. In this case, the differential IF output imped-
ance is 400Ω since the bandpass network does not
transform the impedance.
Additional matching elements may be required if the SAW
filter’s input impedance is less than or greater than 400Ω.
Contact the factory for application assistance.
LT5527
14
Standard Evaluation Board Layout
U
U
W
U
Figure 14. Bandpass IF Matching for Differential IF Architectures
DECOUPLING
SUPPLY
Discrete IF Evaluation Board Layout
IF
IF
+
–
C3
V
L1
L2
CC
FILTER
SAW
AMP
5527 F14
IF
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