4
PBA 313 01
EN/LZT 146 65 R3B Ericsson Microelectronics AB, October 2001
Parameter
Condition
Symbol
Min
Typ
Max
Unit
Transmitter Performance
Frequency modulation
Deviation from
fMod
140
155
175
kHz
center frequency9)
Initial frequency error
10)
-75
0
+75
kHz
TX power
-4
4.5
dBm
TX carrier drift
1 slot (366 s)
fDrift1
-25
25
kHz
3 slots (1598 s)
fDrift2
-40
40
kHz
5 slots (2862 s)
fDrift3
-40
40
kHz
20 dB bandwidth
Measured with RBW: 10 kHz and peak detector
600
1000
kHz
Spurious Emissions
30 MHz – 1GHz
-36
dBm
1 GHz – 12.75 GHz
-30
dBm
1.8 GHz – 1.9 GHz
-47
dBm
5.15 GHz – 5.3 GHz
-47
dBm
Figure 3. Blocking examples.
C/I Blocking
The blocking characteristics can be basically split into two
regions: In-band and Out-of-band. Blocking is performed
both on the chip and on the module level.
Out-of-band
– Antenna filter, DC to 1.9 GHz and 3:rd harmonic.
- Switch, low freq. and 2:nd harmonic.
- RX-balun, low freq. and 2:nd harmonic.
- On-chip IF filter.
RF Specifications, cont.
Figure 2 shows the combination blocking effect of the
antenna switch, antenna filter and RX balun. In addition to the
blocking characteristics shown in figure 2, there is antenna
isolation and filtering on the chip. Marker 1 shows the region
where the Bluetooth band is located. Markers 2 - 4 show the
blocking at the telecom frequency bands.
An example of total blocking characteristics can be seen in
figure 3.
Figure 2. Typical out-of-band blocking characteristics excluding
antenna isolation and on chip filtering.
Example 2
Interferenc e of +33 dBm a t 1910 MHz.
Antenna isolation
25 dB
Antenna filter,
36 dB
Antenna switch,
RX-balun
Interference level before
IF filter +33-25-36=
-28 dBm
0.1% BER carrier
level -40 + (-28)=
-68 dBm
Example 1
Interferenc e of +33 dBm a t 2015 MHz.
Antenna isolation
15 dB
Antenna filter,
27 dB
Antenna switch,
RX-balun
Interference level before
IF filter +33-15-27=
-9 dBm
0.1% BER carrier
level -40 + (-9)=
-49 dBm
0.1% BER requires a C/I of more than -40 dB at the IF filter.
9) fMod = (FMod1-FMod0)/2.
10) The initial frequency is mainly affected by the tolerance of the reference frequency or crystal; for every 1Hz deviation from 12MHz, the TX carrier offset is
altered by approximately 186Hz.
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
GHz
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
m1
freq=2.450GHz
dB( RX path)=
m1
m2
freq=900.0MHz
dB(RX path) =
m2
m3
freq=1.800GHz
=
m3
m4
freq=1.900GHz
) =
m4
dB(RX
path)
dB(RX path)
dB(RX path
-3.529
-74.58
-47.426
-36.537