CCS/CC430F5137: TX Power value (PATABLE)

Valery Beloglazov

Part Number: CC430F5137
Other Parts Discussed in Thread: CC1101

Tool/software: Code Composer Studio

I have a RF power amplifier at 27dBm.
When connecting the CC430F5137 to the SmartRF Studio, I set the output power to 0 dB (0x8D in the PATABLE). On the output of the amplifier, the power meter (NRP-Z23 by Rohde & Schwarz) shows 27 dBm.
If I set the output power to -6 dBm (0x2D in the PATABLE), the power meter shows 21 dBm. (-6dBm+27dBm=21dBm)
If I set the power to 10 dBm (0xC3 in the PATABLE), then the meter shows 23 dBm.
If you manually enter the value 0xC0, the power meter shows 32 dBm.
What is really the power at 0xC3 and 0xC0 in the PATABLE?
what am I doing wrong?

over 6 years ago

0 TER over 6 years ago

TI__Guru**** 317180 points

According to www.ti.com/.../swra151a.pdf, using 0xC0 vs 0xC3 should give ~ 1dB higher output power (CC430 uses the same PA as on CC1101)

Not sure what you mean by "I have a RF power amplifier at 27dBm."
- Do you mean a gain of 27 dB? If that is the case, what is the max output power?
- Do you mean max output power of 27 dBm

Do you have a datasheet for the PA?

0 Valery Beloglazov over 6 years ago in reply to TER

Prodigy 175 points

The amplifier is assembled at HMC452ST89 433 MHz. Gain 27dbm ( maximum output power 1000mW).
This amplifier has been manufactured by another company for several years already, but the simplest SAW resonator (~433MHz) was used as a transmitter.
Design Note DN013 (PATABLE for CC1101):
Page 7
0xC0 = 9,9 dBm
0xC3 = 8,8 dBm (if SmartRF this corresponds to 10 dBm)
0x8D = 0,6 dBm
0x2C = -6 dBm (but in SmartRF 0x2D = -6 dBm)

0 TER over 6 years ago in reply to Valery Beloglazov

TI__Guru**** 317180 points

From the datasheet it looks like max is 30 dBm, hence a reading of 32 dBm should not be possible.

The "Power Compression @ 400 MHz" graph indicate that adding 27 dB when the input signal is above 0 dBm is not valid.

0 Valery Beloglazov over 6 years ago in reply to TER

Prodigy 175 points

Does this mean the amplifier is in overload? And introduces distortions that lead to such strange results?

0 TER over 6 years ago in reply to Valery Beloglazov

TI__Guru**** 317180 points

I doubt it based on the datasheet but since this is not a TI part it's limited what I can help with regards to the PA. We can help you with the CC430 part but then you have to measure at the output of C430 and not on the output of the PA.

0 Valery Beloglazov over 6 years ago in reply to TER

Prodigy 175 points

Thanks for your help.
I am quite pleased with the work of СС430 with an output power of 0dB. I was confused by the measurements.

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CCS/CC430F5137: TX Power value (PATABLE)