Question about TX power,patable

Hi Sverre,

Thank you for your reply.

when I want to take out a wave pattern such as the figure "FREND0.PA_POWER = 7 " in OOK/ASK

Should I set the TX POWER VALUE in PATABLE[0]~[7]  for good ramping     PA[0] < PA[1] < PA[2] < PA[3] < PA[4] < PA[5] < PA[6] < PA[7] ?

Thank you for your help.

kenji

Hi Sverre,

Thank you for your reply

I confirmed it by SmartRF04EB for paramping's PATABLE consisting of 8 entries now.

Thank you so much.

kenji

Is this description valid for FSK/GFSK modulation?

I have a problem with the 6th harm. -> it is to big, so I am searching for a solution. From the test lab I got the answer that we "switch to strong".

Could I solve this using PA Table ie set 2 or 3 power grades, to "switch bits gently"

Thank you.

PS

On the picture, is the proposed power limit, ie we shoud stay out of tv band...

We could solve the problem by setting the lower send power, but we need 10dBm..

What is the level of the 6th harmonic and exact frequency ?

What is your operating frequency and output power level ?

Regards,   Richard.

Thanks for a fast answer.

We use 868.9 MHz. Harmonic power is visible on the posted picture..

We use this CC1101 Parameter set:

const unsigned char A_Link_Config[] = {
    0x06,    //IOCFG2 // relative carrier sense.
    0x2E,    //IOCFG1
    0x02,    //IOCFG0
    0x00,    //FIFOTHR        // ASSERT WHEN TX BUFF 29, AND RX 35
    0x54,    //SYNC1
    0x76,    //SYNC0
    0xFF,     //PKTLEN
    0x84,    //PKTCTRL1
    0x00,    //PKTCTRL0
    0x00,    //ADDR
    0x00,    //CHANNR
    0x08,    //FSCTRL1
    0x00,    //FSCTRL0
    0x21,    //FREQ2
    0x65,    //FREQ1
    0x6A,    //FREQ0
    //0x6A,    //MDMCFG4
    //0x4A,    //MDMCFG3
    //test setting
    0x5C,    //MDMCFG4 // 103149Hz
    0x04,    //MDMCFG3
    0x15,    //MDMCFG2 /// gfsk on
    0x42,    //MDMCFG1 // 8 preamble bytes
    0xF8,    //MDMCFG0
    0x42,    //DEIVATN -> test settings
    //0x47,    //DEIVATN
    0x07,    //MCSM2
    0x30,    //MCSM1        //go to FSTXON mode 0101 0==> go to idle state
    0x18,    //MCSM0        // calibrate every fourth time.
    0x2E,    //FOCCFG
    0x6D,    //BSCFG
    0x04,    //AGCCTRL2
    0x19,    //AGCCTRL1
    0xB2,    //AGCCTRL0
    0x87,    //WOREVT1
    0x6B,    //WOREVT0
    0xFB,    //WORCTRL
    0xB6,    //FREND1
    0x10,    //FREND0
    0xEA,    //FSCAL3
    0x2A,    //FSCAL2
    0x00,    //FSCAL1
    0x1F,    //FSCAL0
    0x41,    //RCCTRL1
    0x00,    //RCCTRL0
    0x59,    //FSTEST
    0x7F,    //PTEST
    0x3F,    //AGCTEST
    0x81,    //TEST2
    0x35,    //TEST1
    0x09    // TEST0
   

};

What are the possibilities to reduce the power of the 6 harm, only by changing software( cc1101 parameters)?

Regards,

Ervin

Hi,

Is the harmonic spur at 5.2123 GHz or 5.2134 GHz ?

Regards, Richard.

Hi.

.

It is 5.2134GHz

With some hardware changes we pushed 6th under -30dBm (marker 1), and that is (almost) ok, but we are still not satisfied...

So back to my question, does this PA table ramping system works with FSK/GFSK?

The harmonics level is not dependent on whether PA ramping is enabled or not. Please note that when doing compliance testing under En 300 220 you will measure the radiated spurious level. The antenna has a finite BW and will lower the 6th harmonic to well below -30 dBm.

Agree also that with a 868 MHz antenna; the radiated level will be significantly lower and PA ramping will not help here.

With standard multi-layer inductors from Murata the level of the 6th harmonic is usually around -56 dBm conducted with 12dBm output power at 868 MHz so your level seems quite high. If wire wound inductors are used the level can be surpressed furthermore but multi-layer inductors should be sufficient. 

Check out DN032 (http://www.ti.com/litv/pdf/swra346) concerning the choice of inductors used in the RF structure.

Regards,   Richard.