ETS2228 Maintenance Manual
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Page 26, Total 43
Table 10 PLL circuit
RX-QP/RX-QM/RX-IM/RX-IP refers to the output of 4 baseband signals. They are to be sent to
MSM to be processed. SBST/SBCK/SBDT are 3 control BUSES. MSM controls RFR6122 by
controlling these three signals. The TCXO signal provides clock reference signals for all internal
components. Three categories of power provide power for RFR: VREG-RFRX provides power voltage
for PM6610; VREG-TCXO provides voltage needed by the clock for RFR6122; VREG-MSMP provides
voltage for internal RFR6122 components. RF local oscillation signals are for receiving/transmission
channels to conduct down/up conversion operations. Both channels share the same RF local oscillation
signal.
Rx-LO-IN
VCO-TUNE
RX-FAQ
LO-OUT
Fv
TCXO
R
Counter
N
RX
LO
RFT6122
RFR6122
Fr
Digital logic
interface
Phase
checking
SBI control
RX-CP
（
RX-LO-BUFF
）
（
CP-RX
）
note
：
Red signal is the definition of RFT pins, blue signal is the definition of RFR PIN, green signal is the definition of interface.
RX
VCO
RX-CP
Loop filter
LOCK
