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| U4062B Datasheet, PDF (9/21 Pages) TEMIC Semiconductors – HF Front End for Car Radios and HiFi Receivers | |||
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120
110
100
90
80
70
80
95 10419
90
100
110
120
Vi OSC Pin 17 ( dBmV )
Figure 15. VOsc vs. Vi Osc
Mixer
U4062B
100
90
80
70
60
50
40
30
20
80 85 90 95 100 105 110 115
95 10420
ViRF ( dBmV )
Figure 16. aFM vs. ViRF
Figure 17. Test circuit
IL1, IL2 = Insertion loss of the RF transformers
VCDVoGRIFnFC1v52âe=â6r1sG3(ido(CBdn(BmVpmVoOVw)S)=eCr=1V7gV)iaRoâiFnIFG(Gd(CdBCB(m=nmVoV2m)0)âilnâoIaLgIlL1)(22(d(VdBBo)I)F+/+V66iRF) + IL1 (dB) + IL2 (dB)
Input to output IF isolation
aIF = 20 log (2 VoIF/ViIF) + IL1 (dB) + IL2 (dB) â GC (nominal)
Characteristics aFM versus viRF, see previous page
Oscillator frequency immunity against amplitude modulated signal at mixer input (Pin 5â6) related to FM standard
modulation:
aFM = 20 log [75 kHz/DfOSC(viRF)] whereas
viRF = mixer input signal (fiRF = 89.3 MHz, m = 0.8, fM = 1 kHz)
Rev. A1, 07-Dec-98
9 (21)
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