The phase noise of Limesdr

#1

Hi,
I have been testing my LimeSDR with MXA N9020 signal analyzer these days. I found that the phase noise of the Limesdr is pretty bad and didn’t meet the spec in the datasheet of LMS7002M chip.
I use the LimeSuite GUI for testing and generate several carriers. I think is an issue about my settings. Someone can provide me a suitable .ini file?
Thanks
Here post my test plot.


Meanwhile, I test a LTE TM3 QAM64 20MHz signal with the .wfm file you provide. Why the EVM is such terrible?

#2

Hi @Dynamix_yang,

Could you describe please how do you configure (assuming) LimeSDR-USB board. What RF output do you use?

#3

Hi Zack,
I tried both TX1&2 High&low. The phase noise seems to be the same and is only related to the frequency.
I use “TX_power_measurement.ini” download from the other topic to do the test. I also use “self_test.ini” and “example.ini”, but things haven’t changed.
Here posted the “TX_power_measurement.ini”.
[file_info]

type=lms7002m_minimal_config

version=1

[lms7002_registers_a]

0x0020=0xFFFD

0x0021=0x0E9F

0x0022=0x07DF

0x0023=0x5559

0x0024=0xE4E4

0x0025=0x0101

0x0026=0x0101

0x0027=0xE4E4

0x0028=0x0101

0x0029=0x0101

0x002A=0x0086

0x002B=0x0038

0x002C=0x0000

0x002D=0x0000

0x002E=0x0000

0x002F=0x3841

0x0081=0x0000

0x0082=0x800B

0x0084=0x0400

0x0085=0x0001

0x0086=0x4901

0x0087=0x0000

0x0088=0x04F0

0x0089=0x0048

0x008A=0x0514

0x008B=0x216A

0x008C=0x267B

0x0092=0x0001

0x0093=0x0000

0x0094=0x0000

0x0095=0x0000

0x0096=0x0000

0x0097=0x0000

0x0098=0x0000

0x0099=0x6565

0x009A=0x658C

0x009B=0x6565

0x009C=0x658C

0x009D=0x6565

0x009E=0x658C

0x009F=0x658C

0x00A0=0x6565

0x00A1=0x6565

0x00A2=0x6565

0x00A3=0x6565

0x00A4=0x6565

0x00A5=0x6565

0x00A6=0x000F

0x00A7=0x6565

0x00A8=0x0000

0x00A9=0x0000

0x00AA=0x0000

0x00AB=0x0000

0x00AC=0x0000

0x00AD=0x03FF

0x00AE=0xF000

0x0100=0x3409

0x0101=0x7800

0x0102=0x3180

0x0103=0x0A12

0x0104=0x0088

0x0105=0x0011

0x0106=0x318C

0x0107=0x318C

0x0108=0xFD8C

0x0109=0x61C1

0x010A=0x104C

0x010B=0x0000

0x010C=0x8805

0x010D=0x009E

0x010E=0x2040

0x010F=0x30C6

0x0110=0x2B14

0x0111=0x0083

0x0112=0xC0E6

0x0113=0x03C3

0x0114=0x008D

0x0115=0x0009

0x0116=0x8180

0x0117=0x280C

0x0118=0x018C

0x0119=0x528B

0x011A=0x2E02

0x011C=0xAD41

0x011D=0x0000

0x011E=0x0713

0x011F=0x3680

0x0120=0xB9FF

0x0121=0x3544

0x0122=0x033F

0x0123=0x267B

0x0124=0x0000

0x0125=0x9400

0x0126=0x12FF

0x0200=0x008D

0x0201=0x07FF

0x0202=0x07FF

0x0203=0x0000

0x0204=0x0000

0x0205=0x0000

0x0206=0x0000

0x0207=0x0000

0x0208=0x01F0

0x0209=0x0000

0x020A=0x0000

0x020B=0x0000

0x020C=0x7FFF

0x0240=0x0020

0x0241=0x0000

0x0242=0x0000

0x0243=0x0000

0x0244=0x0000

0x0245=0x0000

0x0246=0x0000

0x0247=0x0000

0x0248=0x0000

0x0249=0x0000

0x024A=0x0000

0x024B=0x0000

0x024C=0x0000

0x024D=0x0000

0x024E=0x0000

0x024F=0x0000

0x0250=0x0000

0x0251=0x0000

0x0252=0x0000

0x0253=0x0000

0x0254=0x0000

0x0255=0x0000

0x0256=0x0000

0x0257=0x0000

0x0258=0x0000

0x0259=0x0000

0x025A=0x0000

0x025B=0x0000

0x025C=0x0000

0x025D=0x0000

0x025E=0x0000

0x025F=0x0000

0x0260=0x0000

0x0261=0x0000

0x0280=0x0000

0x0281=0x0000

0x0282=0x0000

0x0283=0x0000

0x0284=0x0000

0x0285=0x0000

0x0286=0x0000

0x0287=0x0000

0x0288=0x0000

0x0289=0x0000

0x028A=0x0000

0x028B=0x0000

0x028C=0x0000

0x028D=0x0000

0x028E=0x0000

0x028F=0x0000

0x0290=0x0000

0x0291=0x0000

0x0292=0x0000

0x0293=0x0000

0x0294=0x0000

0x0295=0x0000

0x0296=0x0000

0x0297=0x0000

0x0298=0x0000

0x0299=0x0000

0x029A=0x0000

0x029B=0x0000

0x029C=0x0000

0x029D=0x0000

0x029E=0x0000

0x029F=0x0000

0x02A0=0x0000

0x02A1=0x0000

0x02A2=0x0000

0x02A3=0x0000

0x02A4=0x0000

0x02A5=0x0000

0x02A6=0x0000

0x02A7=0x0000

0x02C0=0x0000

0x02C1=0x0000

0x02C2=0x0000

0x02C3=0x0000

0x02C4=0x0000

0x02C5=0x0000

0x02C6=0x0000

0x02C7=0x0000

0x02C8=0x0000

0x02C9=0x0000

0x02CA=0x0000

0x02CB=0x0000

0x02CC=0x0000

0x02CD=0x0000

0x02CE=0x0000

0x02CF=0x0000

0x02D0=0x0000

0x02D1=0x0000

0x02D2=0x0000

0x02D3=0x0000

0x02D4=0x0000

0x02D5=0x0000

0x02D6=0x0000

0x02D7=0x0000

0x02D8=0x0000

0x02D9=0x0000

0x02DA=0x0000

0x02DB=0x0000

0x02DC=0x0000

0x02DD=0x0000

0x02DE=0x0000

0x02DF=0x0000

0x02E0=0x0000

0x02E1=0x0000

0x02E2=0x0000

0x02E3=0x0000

0x02E4=0x0000

0x02E5=0x0000

0x02E6=0x0000

0x02E7=0x0000

0x0300=0x0000

0x0301=0x0000

0x0302=0x0000

0x0303=0x0000

0x0304=0x0000

0x0305=0x0000

0x0306=0x0000

0x0307=0x0000

0x0308=0x0000

0x0309=0x0000

0x030A=0x0000

0x030B=0x0000

0x030C=0x0000

0x030D=0x0000

0x030E=0x0000

0x030F=0x0000

0x0310=0x0000

0x0311=0x0000

0x0312=0x0000

0x0313=0x0000

0x0314=0x0000

0x0315=0x0000

0x0316=0x0000

0x0317=0x0000

0x0318=0x0000

0x0319=0x0000

0x031A=0x0000

0x031B=0x0000

0x031C=0x0000

0x031D=0x0000

0x031E=0x0000

0x031F=0x0000

0x0320=0x0000

0x0321=0x0000

0x0322=0x0000

0x0323=0x0000

0x0324=0x0000

0x0325=0x0000

0x0326=0x0000

0x0327=0x0000

0x0340=0x0000

0x0341=0x0000

0x0342=0x0000

0x0343=0x0000

0x0344=0x0000

0x0345=0x0000

0x0346=0x0000

0x0347=0x0000

0x0348=0x0000

0x0349=0x0000

0x034A=0x0000

0x034B=0x0000

0x034C=0x0000

0x034D=0x0000

0x034E=0x0000

0x034F=0x0000

0x0350=0x0000

0x0351=0x0000

0x0352=0x0000

0x0353=0x0000

0x0354=0x0000

0x0355=0x0000

0x0356=0x0000

0x0357=0x0000

0x0358=0x0000

0x0359=0x0000

0x035A=0x0000

0x035B=0x0000

0x035C=0x0000

0x035D=0x0000

0x035E=0x0000

0x035F=0x0000

0x0360=0x0000

0x0361=0x0000

0x0362=0x0000

0x0363=0x0000

0x0364=0x0000

0x0365=0x0000

0x0366=0x0000

0x0367=0x0000

0x0380=0x0000

0x0381=0x0000

0x0382=0x0000

0x0383=0x0000

0x0384=0x0000

0x0385=0x0000

0x0386=0x0000

0x0387=0x0000

0x0388=0x0000

0x0389=0x0000

0x038A=0x0000

0x038B=0x0000

0x038C=0x0000

0x038D=0x0000

0x038E=0x0000

0x038F=0x0000

0x0390=0x0000

0x0391=0x0000

0x0392=0x0000

0x0393=0x0000

0x0394=0x0000

0x0395=0x0000

0x0396=0x0000

0x0397=0x0000

0x0398=0x0000

0x0399=0x0000

0x039A=0x0000

0x039B=0x0000

0x039C=0x0000

0x039D=0x0000

0x039E=0x0000

0x039F=0x0000

0x03A0=0x0000

0x03A1=0x0000

0x03A2=0x0000

0x03A3=0x0000

0x03A4=0x0000

0x03A5=0x0000

0x03A6=0x0000

0x03A7=0x0000

0x0400=0x0081

0x0401=0x07FF

0x0402=0x07FF

0x0403=0x0000

0x0404=0x0000

0x0405=0x0000

0x0406=0x0000

0x0407=0x0000

0x0408=0x0000

0x0409=0x0000

0x040A=0x1000

0x040B=0x0000

0x040C=0x0038

0x040D=0x0000

0x040E=0x0000

0x040F=0x0000

0x0440=0x0020

0x0441=0x0000

0x0442=0x0000

0x0443=0x0000

0x0444=0x0000

0x0445=0x0000

0x0446=0x0000

0x0447=0x0000

0x0448=0x0000

0x0449=0x0000

0x044A=0x0000

0x044B=0x0000

0x044C=0x0000

0x044D=0x0000

0x044E=0x0000

0x044F=0x0000

0x0450=0x0000

0x0451=0x0000

0x0452=0x0000

0x0453=0x0000

0x0454=0x0000

0x0455=0x0000

0x0456=0x0000

0x0457=0x0000

0x0458=0x0000

0x0459=0x0000

0x045A=0x0000

0x045B=0x0000

0x045C=0x0000

0x045D=0x0000

0x045E=0x0000

0x045F=0x0000

0x0460=0x0000

0x0461=0x0000

0x0480=0x0000

0x0481=0x0000

0x0482=0x0000

0x0483=0x0000

0x0484=0x0000

0x0485=0x0000

0x0486=0x0000

0x0487=0x0000

0x0488=0x0000

0x0489=0x0000

0x048A=0x0000

0x048B=0x0000

0x048C=0x0000

0x048D=0x0000

0x048E=0x0000

0x048F=0x0000

0x0490=0x0000

0x0491=0x0000

0x0492=0x0000

0x0493=0x0000

0x0494=0x0000

0x0495=0x0000

0x0496=0x0000

0x0497=0x0000

0x0498=0x0000

0x0499=0x0000

0x049A=0x0000

0x049B=0x0000

0x049C=0x0000

0x049D=0x0000

0x049E=0x0000

0x049F=0x0000

0x04A0=0x0000

0x04A1=0x0000

0x04A2=0x0000

0x04A3=0x0000

0x04A4=0x0000

0x04A5=0x0000

0x04A6=0x0000

0x04A7=0x0000

0x04C0=0x0000

0x04C1=0x0000

0x04C2=0x0000

0x04C3=0x0000

0x04C4=0x0000

0x04C5=0x0000

0x04C6=0x0000

0x04C7=0x0000

0x04C8=0x0000

0x04C9=0x0000

0x04CA=0x0000

0x04CB=0x0000

0x04CC=0x0000

0x04CD=0x0000

0x04CE=0x0000

0x04CF=0x0000

0x04D0=0x0000

0x04D1=0x0000

0x04D2=0x0000

0x04D3=0x0000

0x04D4=0x0000

0x04D5=0x0000

0x04D6=0x0000

0x04D7=0x0000

0x04D8=0x0000

0x04D9=0x0000

0x04DA=0x0000

0x04DB=0x0000

0x04DC=0x0000

0x04DD=0x0000

0x04DE=0x0000

0x04DF=0x0000

0x04E0=0x0000

0x04E1=0x0000

0x04E2=0x0000

0x04E3=0x0000

0x04E4=0x0000

0x04E5=0x0000

0x04E6=0x0000

0x04E7=0x0000

0x0500=0x0000

0x0501=0x0000

0x0502=0x0000

0x0503=0x0000

0x0504=0x0000

0x0505=0x0000

0x0506=0x0000

0x0507=0x0000

0x0508=0x0000

0x0509=0x0000

0x050A=0x0000

0x050B=0x0000

0x050C=0x0000

0x050D=0x0000

0x050E=0x0000

0x050F=0x0000

0x0510=0x0000

0x0511=0x0000

0x0512=0x0000

0x0513=0x0000

0x0514=0x0000

0x0515=0x0000

0x0516=0x0000

0x0517=0x0000

0x0518=0x0000

0x0519=0x0000

0x051A=0x0000

0x051B=0x0000

0x051C=0x0000

0x051D=0x0000

0x051E=0x0000

0x051F=0x0000

0x0520=0x0000

0x0521=0x0000

0x0522=0x0000

0x0523=0x0000

0x0524=0x0000

0x0525=0x0000

0x0526=0x0000

0x0527=0x0000

0x0540=0x0000

0x0541=0x0000

0x0542=0x0000

0x0543=0x0000

0x0544=0x0000

0x0545=0x0000

0x0546=0x0000

0x0547=0x0000

0x0548=0x0000

0x0549=0x0000

0x054A=0x0000

0x054B=0x0000

0x054C=0x0000

0x054D=0x0000

0x054E=0x0000

0x054F=0x0000

0x0550=0x0000

0x0551=0x0000

0x0552=0x0000

0x0553=0x0000

0x0554=0x0000

0x0555=0x0000

0x0556=0x0000

0x0557=0x0000

0x0558=0x0000

0x0559=0x0000

0x055A=0x0000

0x055B=0x0000

0x055C=0x0000

0x055D=0x0000

0x055E=0x0000

0x055F=0x0000

0x0560=0x0000

0x0561=0x0000

0x0562=0x0000

0x0563=0x0000

0x0564=0x0000

0x0565=0x0000

0x0566=0x0000

0x0567=0x0000

0x0580=0x0000

0x0581=0x0000

0x0582=0x0000

0x0583=0x0000

0x0584=0x0000

0x0585=0x0000

0x0586=0x0000

0x0587=0x0000

0x0588=0x0000

0x0589=0x0000

0x058A=0x0000

0x058B=0x0000

0x058C=0x0000

0x058D=0x0000

0x058E=0x0000

0x058F=0x0000

0x0590=0x0000

0x0591=0x0000

0x0592=0x0000

0x0593=0x0000

0x0594=0x0000

0x0595=0x0000

0x0596=0x0000

0x0597=0x0000

0x0598=0x0000

0x0599=0x0000

0x059A=0x0000

0x059B=0x0000

0x059C=0x0000

0x059D=0x0000

0x059E=0x0000

0x059F=0x0000

0x05A0=0x0000

0x05A1=0x0000

0x05A2=0x0000

0x05A3=0x0000

0x05A4=0x0000

0x05A5=0x0000

0x05A6=0x0000

0x05A7=0x0000

0x05C0=0x00FF

0x05C1=0x0000

0x05C2=0x0000

0x05C3=0x0000

0x05C4=0x0000

0x05C5=0x0000

0x05C6=0x0000

0x05C7=0x0000

0x05C8=0x0000

0x05C9=0x0000

0x05CA=0x0000

0x05CB=0x2020

0x05CC=0x0000

0x0600=0x0F00

0x0601=0x0000

0x0602=0x2000

0x0603=0x0000

0x0604=0x0000

0x0605=0x0000

0x0606=0x0000

0x0640=0x00A0

0x0641=0x1020

[lms7002_registers_b]

0x0100=0x340F

0x0101=0x7800

0x0102=0x3180

0x0103=0x0A12

0x0104=0x0088

0x0105=0x001F

0x0106=0x318C

0x0107=0x318C

0x0108=0x958C

0x0109=0x61C1

0x010A=0x104C

0x010B=0x0000

0x010C=0x88FF

0x010D=0x009E

0x010E=0x2040

0x010F=0x30C6

0x0110=0x0994

0x0111=0x0083

0x0112=0xC0E6

0x0113=0x03C3

0x0114=0x008D

0x0115=0x000F

0x0116=0x8180

0x0117=0x280C

0x0118=0x018C

0x0119=0x528B

0x011A=0x2E02

0x011C=0xA941

0x011D=0x5555

0x011E=0x07E3

0x011F=0x3640

0x0120=0xB9FF

0x0121=0x31B0

0x0122=0x033F

0x0123=0x267B

0x0124=0x0000

0x0125=0x9400

0x0126=0x12FF

0x0200=0x0081

0x0201=0x07FF

0x0202=0x07FF

0x0203=0x0000

0x0204=0x0000

0x0205=0x0000

0x0206=0x0000

0x0207=0x0000

0x0208=0x0070

0x0209=0x0000

0x020A=0x0000

0x020B=0x0000

0x020C=0x0000

0x0240=0x0020

0x0241=0x0000

0x0242=0x0000

0x0243=0x0000

0x0244=0x0000

0x0245=0x0000

0x0246=0x0000

0x0247=0x0000

0x0248=0x0000

0x0249=0x0000

0x024A=0x0000

0x024B=0x0000

0x024C=0x0000

0x024D=0x0000

0x024E=0x0000

0x024F=0x0000

0x0250=0x0000

0x0251=0x0000

0x0252=0x0000

0x0253=0x0000

0x0254=0x0000

0x0255=0x0000

0x0256=0x0000

0x0257=0x0000

0x0258=0x0000

0x0259=0x0000

0x025A=0x0000

0x025B=0x0000

0x025C=0x0000

0x025D=0x0000

0x025E=0x0000

0x025F=0x0000

0x0260=0x0000

0x0261=0x0000

0x0280=0x0000

0x0281=0x0000

0x0282=0x0000

0x0283=0x0000

0x0284=0x0000

0x0285=0x0000

0x0286=0x0000

0x0287=0x0000

0x0288=0x0000

0x0289=0x0000

0x028A=0x0000

0x028B=0x0000

0x028C=0x0000

0x028D=0x0000

0x028E=0x0000

0x028F=0x0000

0x0290=0x0000

0x0291=0x0000

0x0292=0x0000

0x0293=0x0000

0x0294=0x0000

0x0295=0x0000

0x0296=0x0000

0x0297=0x0000

0x0298=0x0000

0x0299=0x0000

0x029A=0x0000

0x029B=0x0000

0x029C=0x0000

0x029D=0x0000

0x029E=0x0000

0x029F=0x0000

0x02A0=0x0000

0x02A1=0x0000

0x02A2=0x0000

0x02A3=0x0000

0x02A4=0x0000

0x02A5=0x0000

0x02A6=0x0000

0x02A7=0x0000

0x02C0=0x0000

0x02C1=0x0000

0x02C2=0x0000

0x02C3=0x0000

0x02C4=0x0000

0x02C5=0x0000

0x02C6=0x0000

0x02C7=0x0000

0x02C8=0x0000

0x02C9=0x0000

0x02CA=0x0000

0x02CB=0x0000

0x02CC=0x0000

0x02CD=0x0000

0x02CE=0x0000

0x02CF=0x0000

0x02D0=0x0000

0x02D1=0x0000

0x02D2=0x0000

0x02D3=0x0000

0x02D4=0x0000

0x02D5=0x0000

0x02D6=0x0000

0x02D7=0x0000

0x02D8=0x0000

0x02D9=0x0000

0x02DA=0x0000

0x02DB=0x0000

0x02DC=0x0000

0x02DD=0x0000

0x02DE=0x0000

0x02DF=0x0000

0x02E0=0x0000

0x02E1=0x0000

0x02E2=0x0000

0x02E3=0x0000

0x02E4=0x0000

0x02E5=0x0000

0x02E6=0x0000

0x02E7=0x0000

0x0300=0x0000

0x0301=0x0000

0x0302=0x0000

0x0303=0x0000

0x0304=0x0000

0x0305=0x0000

0x0306=0x0000

0x0307=0x0000

0x0308=0x0000

0x0309=0x0000

0x030A=0x0000

0x030B=0x0000

0x030C=0x0000

0x030D=0x0000

0x030E=0x0000

0x030F=0x0000

0x0310=0x0000

0x0311=0x0000

0x0312=0x0000

0x0313=0x0000

0x0314=0x0000

0x0315=0x0000

0x0316=0x0000

0x0317=0x0000

0x0318=0x0000

0x0319=0x0000

0x031A=0x0000

0x031B=0x0000

0x031C=0x0000

0x031D=0x0000

0x031E=0x0000

0x031F=0x0000

0x0320=0x0000

0x0321=0x0000

0x0322=0x0000

0x0323=0x0000

0x0324=0x0000

0x0325=0x0000

0x0326=0x0000

0x0327=0x0000

0x0340=0x0000

0x0341=0x0000

0x0342=0x0000

0x0343=0x0000

0x0344=0x0000

0x0345=0x0000

0x0346=0x0000

0x0347=0x0000

0x0348=0x0000

0x0349=0x0000

0x034A=0x0000

0x034B=0x0000

0x034C=0x0000

0x034D=0x0000

0x034E=0x0000

0x034F=0x0000

0x0350=0x0000

0x0351=0x0000

0x0352=0x0000

0x0353=0x0000

0x0354=0x0000

0x0355=0x0000

0x0356=0x0000

0x0357=0x0000

0x0358=0x0000

0x0359=0x0000

0x035A=0x0000

0x035B=0x0000

0x035C=0x0000

0x035D=0x0000

0x035E=0x0000

0x035F=0x0000

0x0360=0x0000

0x0361=0x0000

0x0362=0x0000

0x0363=0x0000

0x0364=0x0000

0x0365=0x0000

0x0366=0x0000

0x0367=0x0000

0x0380=0x0000

0x0381=0x0000

0x0382=0x0000

0x0383=0x0000

0x0384=0x0000

0x0385=0x0000

0x0386=0x0000

0x0387=0x0000

0x0388=0x0000

0x0389=0x0000

0x038A=0x0000

0x038B=0x0000

0x038C=0x0000

0x038D=0x0000

0x038E=0x0000

0x038F=0x0000

0x0390=0x0000

0x0391=0x0000

0x0392=0x0000

0x0393=0x0000

0x0394=0x0000

0x0395=0x0000

0x0396=0x0000

0x0397=0x0000

0x0398=0x0000

0x0399=0x0000

0x039A=0x0000

0x039B=0x0000

0x039C=0x0000

0x039D=0x0000

0x039E=0x0000

0x039F=0x0000

0x03A0=0x0000

0x03A1=0x0000

0x03A2=0x0000

0x03A3=0x0000

0x03A4=0x0000

0x03A5=0x0000

0x03A6=0x0000

0x03A7=0x0000

0x0400=0x0081

0x0401=0x07FF

0x0402=0x07FF

0x0403=0x0000

0x0404=0x0000

0x0405=0x0000

0x0406=0x0000

0x0407=0x0000

0x0408=0x0000

0x0409=0x0000

0x040A=0x1000

0x040B=0x0000

0x040C=0x0038

0x040D=0x0000

0x040E=0x0000

0x040F=0x0000

0x0440=0x0020

0x0441=0x0000

0x0442=0x0000

0x0443=0x0000

0x0444=0x0000

0x0445=0x0000

0x0446=0x0000

0x0447=0x0000

0x0448=0x0000

0x0449=0x0000

0x044A=0x0000

0x044B=0x0000

0x044C=0x0000

0x044D=0x0000

0x044E=0x0000

0x044F=0x0000

0x0450=0x0000

0x0451=0x0000

0x0452=0x0000

0x0453=0x0000

0x0454=0x0000

0x0455=0x0000

0x0456=0x0000

0x0457=0x0000

0x0458=0x0000

0x0459=0x0000

0x045A=0x0000

0x045B=0x0000

0x045C=0x0000

0x045D=0x0000

0x045E=0x0000

0x045F=0x0000

0x0460=0x0000

0x0461=0x0000

0x0480=0x0000

0x0481=0x0000

0x0482=0x0000

0x0483=0x0000

0x0484=0x0000

0x0485=0x0000

0x0486=0x0000

0x0487=0x0000

0x0488=0x0000

0x0489=0x0000

0x048A=0x0000

0x048B=0x0000

0x048C=0x0000

0x048D=0x0000

0x048E=0x0000

0x048F=0x0000

0x0490=0x0000

0x0491=0x0000

0x0492=0x0000

0x0493=0x0000

0x0494=0x0000

0x0495=0x0000

0x0496=0x0000

0x0497=0x0000

0x0498=0x0000

0x0499=0x0000

0x049A=0x0000

0x049B=0x0000

0x049C=0x0000

0x049D=0x0000

0x049E=0x0000

0x049F=0x0000

0x04A0=0x0000

0x04A1=0x0000

0x04A2=0x0000

0x04A3=0x0000

0x04A4=0x0000

0x04A5=0x0000

0x04A6=0x0000

0x04A7=0x0000

0x04C0=0x0000

0x04C1=0x0000

0x04C2=0x0000

0x04C3=0x0000

0x04C4=0x0000

0x04C5=0x0000

0x04C6=0x0000

0x04C7=0x0000

0x04C8=0x0000

0x04C9=0x0000

0x04CA=0x0000

0x04CB=0x0000

0x04CC=0x0000

0x04CD=0x0000

0x04CE=0x0000

0x04CF=0x0000

0x04D0=0x0000

0x04D1=0x0000

0x04D2=0x0000

0x04D3=0x0000

0x04D4=0x0000

0x04D5=0x0000

0x04D6=0x0000

0x04D7=0x0000

0x04D8=0x0000

0x04D9=0x0000

0x04DA=0x0000

0x04DB=0x0000

0x04DC=0x0000

0x04DD=0x0000

0x04DE=0x0000

0x04DF=0x0000

0x04E0=0x0000

0x04E1=0x0000

0x04E2=0x0000

0x04E3=0x0000

0x04E4=0x0000

0x04E5=0x0000

0x04E6=0x0000

0x04E7=0x0000

0x0500=0x0000

0x0501=0x0000

0x0502=0x0000

0x0503=0x0000

0x0504=0x0000

0x0505=0x0000

0x0506=0x0000

0x0507=0x0000

0x0508=0x0000

0x0509=0x0000

0x050A=0x0000

0x050B=0x0000

0x050C=0x0000

0x050D=0x0000

0x050E=0x0000

0x050F=0x0000

0x0510=0x0000

0x0511=0x0000

0x0512=0x0000

0x0513=0x0000

0x0514=0x0000

0x0515=0x0000

0x0516=0x0000

0x0517=0x0000

0x0518=0x0000

0x0519=0x0000

0x051A=0x0000

0x051B=0x0000

0x051C=0x0000

0x051D=0x0000

0x051E=0x0000

0x051F=0x0000

0x0520=0x0000

0x0521=0x0000

0x0522=0x0000

0x0523=0x0000

0x0524=0x0000

0x0525=0x0000

0x0526=0x0000

0x0527=0x0000

0x0540=0x0000

0x0541=0x0000

0x0542=0x0000

0x0543=0x0000

0x0544=0x0000

0x0545=0x0000

0x0546=0x0000

0x0547=0x0000

0x0548=0x0000

0x0549=0x0000

0x054A=0x0000

0x054B=0x0000

0x054C=0x0000

0x054D=0x0000

0x054E=0x0000

0x054F=0x0000

0x0550=0x0000

0x0551=0x0000

0x0552=0x0000

0x0553=0x0000

0x0554=0x0000

0x0555=0x0000

0x0556=0x0000

0x0557=0x0000

0x0558=0x0000

0x0559=0x0000

0x055A=0x0000

0x055B=0x0000

0x055C=0x0000

0x055D=0x0000

0x055E=0x0000

0x055F=0x0000

0x0560=0x0000

0x0561=0x0000

0x0562=0x0000

0x0563=0x0000

0x0564=0x0000

0x0565=0x0000

0x0566=0x0000

0x0567=0x0000

0x0580=0x0000

0x0581=0x0000

0x0582=0x0000

0x0583=0x0000

0x0584=0x0000

0x0585=0x0000

0x0586=0x0000

0x0587=0x0000

0x0588=0x0000

0x0589=0x0000

0x058A=0x0000

0x058B=0x0000

0x058C=0x0000

0x058D=0x0000

0x058E=0x0000

0x058F=0x0000

0x0590=0x0000

0x0591=0x0000

0x0592=0x0000

0x0593=0x0000

0x0594=0x0000

0x0595=0x0000

0x0596=0x0000

0x0597=0x0000

0x0598=0x0000

0x0599=0x0000

0x059A=0x0000

0x059B=0x0000

0x059C=0x0000

0x059D=0x0000

0x059E=0x0000

0x059F=0x0000

0x05A0=0x0000

0x05A1=0x0000

0x05A2=0x0000

0x05A3=0x0000

0x05A4=0x0000

0x05A5=0x0000

0x05A6=0x0000

0x05A7=0x0000

0x0600=0x0F00

0x0601=0x0000

0x0602=0x2000

0x0603=0x0000

0x0604=0x0000

0x0605=0x0000

0x0606=0x0000

0x0640=0x00A0

0x0641=0x1020

[reference_clocks]

sxt_ref_clk_mhz=30.72

sxr_ref_clk_mhz=30.72

I can’t find a suitable ini to test, could you give me an example?

#4

Just push “Default” button in LimeSuiteGUI after you connect to the board.

#5

Hi Zack,
I just use the default setting, calculate and tune. Is this a normal phase noise?

#6

Hi @Dynamix_yang,

Could you set span of your MXA from 100Hz to 10MHz and integrate from 1kHz to 10MHz. Then make a measurement.

#7

Hi Zack,
I use the mark function and get this plot.

#8

Hi Zack,
I have noticed that the test data in RF and Analog Measurement Results document is better than my test data post above. Since the LMS7002EVB may have a more serious design for evaluation and the reference frequencies are different, can you guys provide us an official LimeSDR USB/mini tx phase noise measurement and a test configuration like your did for Tx output power measurement?
Thanks!
Snipaste_2019-05-24_09-20-00 Snipaste_2019-05-24_09-20-11

#9

Hi @Dynamix_yang,

Our phase noise measurements can be found here:
https://wiki.myriadrf.org/LimeSDR-Mini-Phase-Noise

#10

Hi Zack,
It is a little disappointing that the phase noise of LimeSDR mini was better than my LimeSDR.
Meanwhile, I find another issue which my limeSDR couldn’t pass the LimeSDR test app.
The RF Loopback test is always failed. Are there any connections between the two issues?
The LEDs are as follows:

  • PWR - Solid Green
  • FX3 - Solid Green or Red momentarily
  • FPGA1 - Blinking Green
  • FPGA2 - Blank

Follows are the log:

[ TESTING STARTED ]

->Start time: Wed Jun 5 21:00:17 2019

Gateware version mismatch!
Expected gateware version 2, revision 17
But found version 2, revision 20
Follow the FW and FPGA upgrade instructions:
http://wiki.myriadrf.org/Lime_Suite#Flashing_images
Or run update on the command line: LimeUtil --update

->Device: LimeSDR-USB, media=USB 3.0, module=FX3, serial=00090726074D2215, index=0
Serial Number: 00090726074D2215

[ Clock Network Test ]
->FX3 GPIF clock test
Test results: 37739; 41495; 45251 - PASSED
->Si5351C test
CLK0: 17554 / 17554 - PASSED
CLK1: 17554 / 17554 - PASSED
CLK2: 17554 / 17554 - PASSED
CLK3: 17554 / 17554 - PASSED
CLK4: 17554 / 17554 - PASSED
CLK5: 17554 / 17554 - PASSED
CLK6: 17554 / 17554 - PASSED
->ADF4002 Test
Result: 10 - PASSED
->VCTCXO test
Results : 5112929 (min); 5113063 (max) - PASSED
->Clock Network Test PASSED

[ FPGA EEPROM Test ]
->Read EEPROM
->Read data: 12 08 07 12 08 07 02
->FPGA EEPROM Test PASSED

[ LMS7002M Test ]
->Perform Registers Test
->External Reset line test
Reg 0x20: Write value 0xFFFD, Read value 0xFFFD
Reg 0x20: value after reset 0x0FFFF
->LMS7002M Test PASSED

[ RF Loopback Test ]
->Configure LMS
SetPllFrequency: error configuring phase
Failed to set sample rate
->RF Loopback Test FAILED

=> Board tests FAILED <=

Elapsed time: 1.54 seconds

#11

Update your board first, as suggested.

#12

Hi Zack,
I run the command “LimeUtil --update”, it seems to be up to date.

PS C:\Program Files\PothosSDR\bin> .\LimeUtil --update
Connected to [LimeSDR-USB [USB 3.0] 90726074D2215]
Existing firmware is same as update (4)
Existing gateware is same as update (2.20)
Firmware and Gateware update is not required.

Programming update complete!
#13

Hi Zack,
I‘ve tried to write the firmware again and the error seems gone.
Thought the phase noise is still a little higher than the measurement you made for LimeSDR mini, there seems no way to deal with this issue at the moment.
For reference, following is my phase noise measurement at 2665 MHz using attached LimeSDR mini phase noise 2665MHz.ini file with ref. clock changed to 30.72 MHz.

Thank you very much for the continuous support. You and your team are so responsible and professional.
BTW, glad to tell you that there are many learners in China like LimeSDR and backed this project in Crowded Supply despite the high tariff. The LimeSDR is an excellent tool for me and my friends to learn signal processing and communication theory, and thank you and your team bring such a great thing to us.
Wish Lime have a bigger achievement!

#14

Have you tried to connect an External Reference like 10 MHz OCXO?

#15

Hi @Dynamix_yang,

You use LimeSDR-Mini register settings file on a LimeSDR-USB board for your PN measurements. You should measure LimeSDR-Mini board ONLY with these.
We will provide same measurements and register settings for LimeSDR-USB in a while.

#16

Hi Zack,
Thanks for reminding. I’m looking forward to your measurements and register settings.
Could you give us some advice about how to improve the PN performance by setting some key registers?
Like which combination of Rzero, Cp, Cz, should we use in PLL loop filter? The higher CLK_H or lower CLK_H is better?
Thanks!

#17

Hi Booth,
I have tried the 10MHz out from a MXA N9020 Signal analyzer and the PN seems not to improve much.
I’ve bought a used ISOTEMP OCXO82-108 from AliExpress and I will test it after arriving.
Since the internal VCTCXO RPT7050A has very good PN performance (-130dBc/Hz@100Hz), I don’t think an ext. OCXO will improve much.
Thanks for helping:)