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MAS9079 Datasheet(PDF) 4 Page - Micro Analog systems |
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MAS9079 Datasheet(HTML) 4 Page - Micro Analog systems |
4 / 9 page 4 (9) DA9079.003 19 May, 2005 ANTENNA TUNING CONSIDERATIONS The ferrite bar antenna having inductance LANT and parasitic coil capacitance CCOIL is tuned to three reception frequencies f1, f2 and f3 by parallel capacitors CANT1, CANT2 and CANT3. The receiver input stage and internal antenna capacitor switches have capacitances CRFI1, COFF2, COFF3 which affect the resonance frequencies. COFF2 and COFF3 are switch capacitances when switches are open. When switches are closed these capacitances are shorted by on resistance of the switches and they are effectively eliminated. Following relationships can be written into three tuning frequencies. Frequency f1 (highest frequency): CTOT1=CCOIL+CANT1+CRFI1+COFF2+COFF3=CCOIL+CANT1+6.5pF+24pF+75pF3=CCOIL+CANT1+105.5pF, 1 1 2 1 TOT ANT C L f ⋅ = π Frequency f2 (middle frequency): CTOT2=CCOIL+CANT1+CANT2+CRFI1+COFF3=CCOIL+CANT1+CANT2+ 6.5pF+75pF3=CCOIL+CANT1+CANT2+ 81.5pF, 2 2 2 1 TOT ANT C L f ⋅ = π Frequency f3 (lowest frequency): CTOT3=CCOIL+CANT1+ CANT2+ CANT3+CRFI1=CCOIL+CANT1+ CANT2+ CANT3+6.5pF, 3 3 2 1 TOT ANT C L f ⋅ = π |
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