U4065B Datasheet, PDF (27/34 Pages) TEMIC Semiconductors – FM Receiver

Interference Sensor (Amplifier)
Figure 44. Interference Sensor Principle Application
U4065B
1 : 2 ^VIIF9
9
IF
I_L1 ^RG9 ^{= 200}
50
12
f_IF
56
2 VI_IF
I_L1 = 0.7 dB
10
V_S
I₁₀
T_amb
AGC Thresholds
Figure 45. AGC Threshold of the Interference IF Amplifier versus Temperature
45.0
44.5
44.0
43.5
43.0
42.5
42.0
41.5
41.0
-30 -20 -10 0
10 20 30 40
T_amb (°C)
50 60 70 80 90
Figure 46. Wideband AGC Threshold (I₁₀ = 1 µA) versus I₁₃
105
108 MHz
100
95
88 MHz
90
98 MHz
85
0
5 10 15 20 25 30 35 40 45 50 55
I₁₃ (µA)
27
4807A–AUDR–05/04