Other Parts Discussed in Thread: LMX2594,
LMX2594与LMX2595的输出(10M-15G)设置完全一样吗?除了二倍VCO
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您好,是的,2594和2595的寄存器配置是完全相同的。
当输出大于15G的时候,2595的VCO才会使用2倍频。
设计输出9G左右的频率,使用频谱仪测试输出为-16dBm;对比 datasheet相差10dB以上了;采用的100M时钟输入;在配置输出有哪些注意的点?是否因为我没配置好寄存器?
您好, 是使用TICSpro配置的吗?附件是我用TICSPro配置的,输入100Mhz,输出MUX选择的是VCO,Bchannel power down,Achannel输出9G的配置。您看下和您的配置一样吗?
R112 0x700000
R111 0x6F0000
R110 0x6E0000
R109 0x6D0000
R108 0x6C0000
R107 0x6B0000
R106 0x6A0000
R105 0x690021
R104 0x680000
R103 0x670000
R102 0x663F80
R101 0x650011
R100 0x640000
R99 0x630000
R98 0x620200
R97 0x610888
R96 0x600000
R95 0x5F0000
R94 0x5E0000
R93 0x5D0000
R92 0x5C0000
R91 0x5B0000
R90 0x5A0000
R89 0x590000
R88 0x580000
R87 0x570000
R86 0x560000
R85 0x55D300
R84 0x540001
R83 0x530000
R82 0x521E00
R81 0x510000
R80 0x506666
R79 0x4F0026
R78 0x4E0003
R77 0x4D0000
R76 0x4C000C
R75 0x4B0800
R74 0x4A0000
R73 0x49003F
R72 0x480001
R71 0x470081
R70 0x46C350
R69 0x450000
R68 0x4403E8
R67 0x430000
R66 0x4201F4
R65 0x410000
R64 0x401388
R63 0x3F0000
R62 0x3E0322
R61 0x3D00A8
R60 0x3C0000
R59 0x3B0001
R58 0x3A9001
R57 0x390020
R56 0x380000
R55 0x370000
R54 0x360000
R53 0x350000
R52 0x340820
R51 0x330080
R50 0x320000
R49 0x314180
R48 0x300300
R47 0x2F0300
R46 0x2E07FD
R45 0x2DC8DF
R44 0x2C00A3
R43 0x2B0000
R42 0x2A0000
R41 0x290001
R40 0x280000
R39 0x2703E8
R38 0x260000
R37 0x250304
R36 0x24002D
R35 0x230004
R34 0x220000
R33 0x211E21
R32 0x200393
R31 0x1F43EC
R30 0x1E318C
R29 0x1D318C
R28 0x1C0488
R27 0x1B0002
R26 0x1A0DB0
R25 0x190C2B
R24 0x18071A
R23 0x17007C
R22 0x160001
R21 0x150401
R20 0x14E048
R19 0x1327B7
R18 0x120064
R17 0x11012C
R16 0x100080
R15 0x0F064F
R14 0x0E1E70
R13 0x0D4000
R12 0x0C5001
R11 0x0B0018
R10 0x0A10D8
R9 0x091604
R8 0x082000
R7 0x0740B2
R6 0x06C802
R5 0x0500C8
R4 0x040A43
R3 0x030642
R2 0x020500
R1 0x010808
R0 0x00251C
输出偏小,能正常lock吗?
另外,其他频率的输出结果正常吗?
使用默认配置看下输出偏小吗?
如果其他频率的输出也偏小的话,可能和layout有关,比如阻抗不匹配导致的信号反射,寄生电容较大导致的信号压摆率上不去(I=C* dV/dT. )