U4062B Datasheet, PDF (12/21 Pages) TEMIC Semiconductors – HF Front End for Car Radios and HiFi Receivers

U4062B
AGC Circuit
I_L1, I_L2
= Insertion loss of the RF transformers,
V_RF7 (dBmV) = V_IRF (dBmV) – I_L1 (dB)+ 6
V_IF13 (dBmV) ₌ V_iIF (dBmV) – I_L2 (dB)
Figure 27. Test circuit
1.0
V₁₄=1.7V
0.8
0.6
V_IF13
0.4
V_S=15V
7V
10V
V_RF7
0.2
0
100 104 108 112 116 120
95 10429
V_RF7, V_IF13 ( dBmV )
Figure 28. V₁₀ vs. V_RF7, V_IF13
1.0
1.2V
0.8
V₁₄=1.3V
0.6
1.1V
0.4
1.0V
0.9V
0.2
0.8V
0
105 107.5 110 112.5 115 117.5 120 122.5 125
95 10430
V_IF13 ( dBmV )
Figure 29. V₁₀ vs. V_IF13
12 (21)
Rev. A1, 07-Dec-98