RFM01 Datasheet, PDF (28/31 Pages) List of Unclassifed Manufacturers – Universal ISM Band FSK Receiver

RFM01
Input impedance
Measured input return loss on the demo boards with suggested matching circuit
315 MHz Matching to 50 Ohm
magdB(S11)
0
-5
-10
-15
-20
-25
-30
-35
-40
200 220 240 260 280 300 320 340 360 380 400
freq. [MHz]
433 MHz Matching to 50 Ohm
magdB(S11)
0
-5
-10
-15
-20
-25
-30
-35
-40
200 220 240 260 280 300 320 340 360 380 400
freq. [MHz]
868 and 915 MHz Matching to 50 Ohm
magdB(S11)
0
-5
-10
-15
-20
-25
-30
-35
800 820 840 860 880 900 920 940 960 980 1000
freq. [MHz]
50ohm
AC
Input Matching circuit
C1
L1
C1
to LNA
LNA 250ohm
to LNA
Frequency [MHz]
915
868
433
315
L1 [nH]
15
15
36
56
C1 [pF]
3
3
7
9
28