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MAS9079A2TC00 датащи(PDF) 4 Page - Micro Analog systems

номер детали MAS9079A2TC00
подробное описание детали  AM Receiver IC
PDF  9 Pages
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производитель  MAS [Micro Analog systems]
домашняя страница  http://www.mas-oy.com
Logo MAS - Micro Analog systems

MAS9079A2TC00 датащи(HTML) 4 Page - Micro Analog systems

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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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