RF6001_1 RFMD [RF Micro Devices], RF6001_1 Datasheet - Page 46

• Manufacturer Part Number: RF6001_1
• Description: FRACTIONAL-N RF SYNTHESIZER WITH MODULATOR AND DIGITAL IF FILTER
• Manufacturer: RFMD [RF Micro Devices]

RF6001
Part of the POLARIS™ TOTAL RADIO™ Solution
GMSK to GMSK EALGN=1, “Alternate” FIFO Mode
The quarter symbol shift CAN be accounted for by setting EALGN to 1. The diagram below presents this situation.
As before there will be a glitch at the rising edge of TX_ST due to the clock reset function causing a phase discontinuity. This
occurs during minimum output power and should not be a problem.
GMSK to GMSK EALGN=1, “Alternate” Serial Mode
If the serial mode interface is used instead if the FIFO then the diagram below presents the transition.
Data changes at MDI on the rising edges of MCK and is read on the falling edges of MCK.
In this diagram G_CNT is set to three to blank the first three serial bits from the baseband system. G_DEF fills the three gar-
bage symbols.
If the serial mode interface is used with MS then the only difference is that MS will pulse on the last G_CNT count.
46 of 70
Data at RF due to
GMSK Modulator
Data at GMSK
FIFO output
Data at RF
FIFO output
Modulator
Mod Input
Effective
Data at
DAC1
TXST
input
MCK
DAC1
TXST
MDI
clock
tail
0
tail
0
tail
0
tail
G_DLY
tail
G_DLY
0
tail
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at ([phone] or [e-mail].
tail
19 qst tp 21
RD_DLY=
data
qst
tail
data
tail
Center of last
Center of last
Noise pulse due clock
RD_DLY=
17 qst to
12 qst
19 qst
12 qst
tail
tail bit
tail
tail bit
GMSK mod
reset
tail
tail
clocks reset
tail
tail
garbage
G_DLY
X
G_DEF
Noise pulse due clock
garbage
First GMSK bit
GMSK mod
X
clocks reset
of next slot
Garbage Bits
reset
G_CNT=3
G_DEF
garbage
G_DEF
RU_DLY= 26qst
X
tail
37 qst
First GMSK bit
tail
G_DEF
G_DLY
for next slot
1
37qst
34qst
tail
RU_DLY=
12 qst
tail
1
tail
tail
tail
22 qst
tail
1
data
tail
tail
data
data
tail
tail
data
tail
data
tail
Center of first
Center of first
data
tail
tail
tail bit
tail bit
Rev A3 DS050929
tail
tail
data
data