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MAS9179 データシート(PDF) 4 Page - Micro Analog systems

部品番号 MAS9179
部品情報  AM Receiver IC
PDF  9 Pages
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メーカー  MAS [Micro Analog systems]
ホームページ  http://www.mas-oy.com
Logo MAS - Micro Analog systems

MAS9179 データシート(HTML) 4 Page - Micro Analog systems

  MAS9179 Datasheet HTML 1Page - Micro Analog systems MAS9179 Datasheet HTML 2Page - Micro Analog systems MAS9179 Datasheet HTML 3Page - Micro Analog systems MAS9179 Datasheet HTML 4Page - Micro Analog systems MAS9179 Datasheet HTML 5Page - Micro Analog systems MAS9179 Datasheet HTML 6Page - Micro Analog systems MAS9179 Datasheet HTML 7Page - Micro Analog systems MAS9179 Datasheet HTML 8Page - Micro Analog systems MAS9179 Datasheet HTML 9Page - Micro Analog systems  
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4 (9)
DA9179.002
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 CRFIP, 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+CRFIP+COFF2+COFF3=CCOIL+CANT1+6pF+37pF+119pF=CCOIL+CANT1+162pF,
1
1
2
1
TOT
ANT C
L
f
⋅
=
π
Frequency f2 (middle frequency):
CTOT2=CCOIL+CANT1+CANT2+CRFIP+COFF3=CCOIL+CANT1+CANT2+ 6pF+119pF=CCOIL+CANT1+CANT2+ 125pF,
2
2
2
1
TOT
ANT C
L
f
⋅
=
π
Frequency
f3 (lowest frequency):
CTOT3=CCOIL+CANT1+ CANT2+ CANT3+CRFIP=CCOIL+CANT1+ CANT2+ CANT3+6pF,
3
3
2
1
TOT
ANT C
L
f
⋅
=
π



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