U4065B Datasheet, PDF (23/34 Pages) TEMIC Semiconductors – FM Receiver

U4065B
Second IF Preamplifier
Figure 35. Second IF Preamplifier Principle Application
1 : 2 ^VIIF5
5
IF
I_L1 ^RG5 ^{= 200}
50
12
f_IF
2 VI_IF
56
Power gain G_IF = 20 log (VO_IF/VI_IF) + I_L1 (dB) + I_L2 (dB)
I_L1; I_L2 = insertion loss of the RF transformers
V_S
330
3
T_amb
VO_IF3
2:1
R_L3 = 200
I_L2
21
65
VO_IF
50
Figure 36. Power Gain of the Second IF Amplifier versus Temperature
18.5
18.0
17.5
17.0
16.5
16.0
15.5
15.0
-30 -20 -10 0
10 20 30 40 50 60 70 80 90
T_amb (°C)
23
4807A–AUDR–05/04