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U4065B Datasheet, PDF (25/34 Pages) TEMIC Semiconductors – FM Receiver
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U4065B
Interference Sensor (Mixer)
Figure 40. Interference Sensor Principle Application
50
2 VIRF1
fIRF1
2 VIRF2
fIRF2
IL1
12
56
15
RG15/16
= 200
16
Interference
mixer
RL11 = 200
11
IL2
21
65
VOIF
fIF
50
fLO
Local
oscillator
VS
IL1 = IL2 = 0.7 dB
Test conditions for characteristic VOIF versus VIRF1:
fLO = 100 MHz, fRF1 = 89.3 MHz, VIRF2 = 0, fIF = fLO - fRF1 = 10.7 MHz
Test conditions for 3rd order IM-characteristic VOIF versus VIRF1, VIRF2:
fLO = 100 MHz, fRF1 = 89.4 MHz, fRF2 = 89.5 MHz, fIF = fLO - (2 fRF1 - 1 fRF2) = 10.7 MHz
IL1, IL2 = insertion loss of the RF transformer
Figure 41. Characteristics of the Interference Sensor (Mixer)
90
80
70
60
50
40
30
20
10
0
60
Conversion
characteristic
3rd order
IM-characteristic
65
70
75
80
85
90
VIRF (dBµV)
95
100
25
4807A–AUDR–05/04
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