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  • 7

    79

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    =6M90MHz

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    208 2009 12

  • FM

    , DDC(Digial Down Conversion)

    ( 1)

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    =6M90MHz Fl'7M

    =rR.-lo 7MHz

    3

    2009 12

    I DDC |

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    P25 PCA

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  • FM

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    3 728MHz9Fb 60

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    2009 12

    4

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    211

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    (

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    212

    FM(16 )

    10MHz [dB]

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    0 0 16

    4 10 252G 24 283 31

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    052009 12

  • FM

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    ( 12)

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    1l BPF

    l7 2009 12

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    , BPF 1 , (75 :50 ) , SN

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    213

  • 0 80 dB 100 dB

    ,A D

    lV ,V mVJ , A D

    ,,

    60 70 80 90 100 110 [MHz]

    (a)?6M,825M,90 MHz

    12 11BPF llE ( )

    70 80 90 400 [MHz]

    (b) 76M,825M,90 MHz

    825 [MHz]

    (a) (4 MHz d ,10 dB dv)

    11BPF FF5(1'

    625 825 [MHz]

    (b)(4 MHz/d 50 ns/d )

    1025

    13

    214

    -80

    2009 12

  • FM

    , (),80 dB 100 dB (10000 100,000 ) (

    10 V 01V lV )

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    602 dB ( ) 176 dB

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    14 A D , 80 MHz SN 74 dB, ENOB 12

    )

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    14

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    , NF[dB]

    60

    10-3_283 10~13

    0 80 90 100 110 [MHz]

    -5

    2-10 -15

    -2080 90

    [MHz](a)a 76M,825M,90 MHz (b)Tl6M.825M 90 vlHz

    15 14 ( )

    ' 2009 12

    -20

    215

  • ()

    10 1og(638 102)=28 3 dB

    ( )

    ,k: (138 10~23),T: (300K )

    A D ,

    R ,

    A D 66dBm,

    24 dB 30 7 dB

    A D

    16 A D

    NF 30 7 dB ,

    NF=10 dB

    BPFBPF 7 dB

    , ,

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    NF MMIC ERA 3(MCL)

    (a) A , 2

    32dB,

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    1

    __ Pn 2 83 10~lS

    16

    216

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    683 102

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    FM ,FM (1/Hz)

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    il]:Wsllitil: ,:

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    17 ,

    A D

    ( NF 307 dB) , 16(a),(b)

    (NF 57 dB,176 dB)

    , (1)

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    ,FM 75 kHz (F=75 kHz), 15 kHz

    ( l 0, 15 kHz)

    =-19dB =22 0dB//F=2 7dB

    -3dB 2

    =-68dB =-30dB O=22 0dBF=2dB

    A7r 30 7dB

    32 3dB=4 8dB

    /17=5?dB(a) A2 (

    =5?dD

    -19dB =22 0dB =-6 8dB/t7r=2 dB

    =13 3dBA7 =4?dB

    =17 6dB

    (b)B1 (=4 6dB)

    Alr=30dB

    FM

    FM

    ::: 3

    2009 12

  • FM

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    FM ( ), ( )

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    FM50 s,

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    , ,

    ( )

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    SN

    18 CORDIC FM ( =192 kHz) ,

    ,FIF0 PC FFT ,9

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    [dBf]

    17 9V ()

    , 52009 12

    (19 kHz) ,4 kHz (17 kHz 21 kHz) , 19 kHz 3 kHz

    , , 100% SN

    ,FFT ,17k 21 kHz

    18 , SN

    19FFT ,FM ( dB )

    FPGA

    18,,NFSN3 4 dB ,.SN

    ,FPCA ,

    2,,

    ,,

    A D SNII

    ,NF,l dB ,,,

    20

    18

    [dBf]

    S (1 )

    B

    AD

    217

  • 19 kHz (F=3 kHz)

    1 k 24 kHz

    (a) :40 dBf

    [kHz]

    (b) :80 dBf

    19 FFT

    FCZ 07S(80MHz)

    1 /1,w38

    DA ( )(FP)

    21

    ,

    SN A D ( ),SN

    ,A D

    ,FPCA PLL ,SN,,

    2

    20 III 2 , A A D

    218

    , T4-1(MCL)

    ,

    FM (76M 90 MHz)

    , ,

    4 FPCA ROM,D A 21 FPGA(18k ),8 10 D A ,ROM,.

    FCZ 07S(801 Hz)

    (FCZ)FCZ 07S(80MHz)

    15p

    2009 12

  • FCZ O?S(80MHz)

    120H /10p

    FM

    01

    3 3 H(

    MAX12554( 0)

    20

    AGC (ACC)

    , ,

    ,ACC

    2009 12

    ACC

    (1) , : FM, ,1978 6

    B1 (F=17 6dB)

    A tl 3 28MHz,14

    (FPCA)

    219

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