RF2418 Просмотр технического описания (PDF) - RF Micro Devices
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RF2418 Datasheet PDF : 12 Pages
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RF2418
R F IN
IF O U T
I
F
F
i
l
V Dt D
e
r
,
5
0
Ω
Application Schematic
Buffered Output Configuration
850 MHz
10 nH
V DD
100 nF
47 pF
C1
R1
1
2
3
4
10pF
5
6 BUFFER
7
LNA
RF AMP
M IX E R
14
13
12
15nH
11
10
1 nF
9
4 pF
8
10 nH
I
m
a
g
e
F
i
l
t
e
r
,
5
0
Ω
L O IN
R2
L1
100 nF
100 nF
L 1 s h o u ld p a ra lle l re s o n a te , a t th e IF fre q u e n cy , w ith th e in te rn a l
1 0 p F c a p a c ito r p lu s a n y e x tra p a ra s itic la y o u t c a p a c ita n c e .
R 1 a n d R 2 a re b ia s re s is to rs th a t s e t th e b ia s c u rre n t fo r th e b u ffe r
a m p lifie r. T h e v a lu e re c o m m e n d e d is 5 1 0 W , e a c h . H ig h e r v a lu e s
w ill d e c re a s e th e c u rre n t c o n s u m p tio n b u t a ls o d e c re a s e th e o u tp u t
le v e l a t w h ic h v o lta g e c lip p in g b e g in s to o c c u r. A t lo w e r IF
fre q u e n c ie s , w h e re th e in te rn a l 1 0 p F c a p a c ito r d o e s n o t ro ll o ff th e
c o n v e rs io n g a in , L 1 m a y b e e lim in a te d .
C 1 is a b lo c k in g c a p a c ito r, in c a s e th e IF filte r's in p u t is n o t a n o p e n
circu it a t D C .
Rev A7 DS060203
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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