This is the Texas Instruments RF Chip TRF6151C (Rita)

It includes a VCO, Mixers, etc.

Data sheet is available from but registration to the chinese forum
is required for download.


The TSP to the TRF6151 uses three wires:
  • CLOCK (regular CLK_13M)
  • STROBE (generated by TPU)
  • DATA (provided by TPU at falling edge of CLOCK, TRF samples data at rising edge of CLOCK)

TSP measurements from C123 phone

Analog I/Q baseband output

During development I've taken some measurements of the I/Q output of the TRF6151. This signal
is fed to the TWL3025 baseband ADC inputs.

The green and black graph of the diagrams below are the "I" channel positive and negative signal.
The magenta graph (M1) is the difference signal computed by the Scope.

All voltages have to be multiplied by a factor of 10, as 10:1 probes were used.

baseband output in idle mode listening on paging channel

This is zoomed out to a very long timebase to see the Rx activity at 1.8 second intervals,
which apparently was the paging channel for the paging group of that IMSI.

I/Q output while listening on the paging channel

multiple consecutive bursts

This shows multiple consecutive received bursts.
You can see that there is a DC offset when the TRF6151 is powered up, but you can't really see data on that DC offset


a single burst

I/Q output zoom of one burst

bits of a burst

I/Q output zoomed in to see individual bits

Files (5)
trf6151_tsp.png View trf6151_tsp.png 8.15 KB TSP measurements from C123 phone laforge, 01/26/2010 06:58 PM
trf6151_iq_rx_burst_distance.png View trf6151_iq_rx_burst_distance.png 9.01 KB TRF6151 receiving several GSM bursts in sequence laforge, 01/29/2010 11:01 PM
trf6151_iq_rx_paging_channel.png View trf6151_iq_rx_paging_channel.png 6.83 KB I/Q output while listening on the paging channel laforge, 01/29/2010 11:02 PM
trf6151_rx_iq_one_burst.png View trf6151_rx_iq_one_burst.png 8.08 KB I/Q output zoom of one burst laforge, 01/29/2010 11:03 PM
trf6151_rx_iq_bits_of_burst.png View trf6151_rx_iq_bits_of_burst.png 9.59 KB I/Q output zoomed in to see individual bits laforge, 01/29/2010 11:04 PM

Updated by laforge about 8 years ago · 10 revisions

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