Nokia 9000i - Uhf Pll; Uhf Vco

After Sales
Technical Documentation
RAE/RAK–1N
RF
Page 3– 24
Amendment 1 04/97
Table 18. VHF VCO + buffer specification
Parameter Minimum Typical /
Nominal
Maximum Unit / Notes
Supply voltage 4.2 4.5 4.8 V
Control voltage 0.5 4.0 V
Supply current GSM
PCN
2.5
3.5
5.0 mA
mA
Operation frequency GSM
PCN
232
400
MHz
MHz
Output power level 170 mV
rms
/ 1 kohm
Control voltage sensitivity
GSM
PCN
12
17
MHz/V
MHz/V
Phase noise, GSM/PCN
f
0
+/– 25 kHz
f
0
+/– 200 kHz
f
0
+/– 1600 kHz
f
0
+/– 3000 kHz
–123
–133
–143
dBc/Hz
dBc/Hz
dBc/Hz
Harmonics –32 –30 dBc
UHF PLL
The UHF PLL consists of a UHF VCO, divider, PLL circuit and a loop
filter. The output signal is used for the 1st mixer of the receiver and the
upconversion mixer of the transmitter. In PCN the VCO changes the
frequency according to the RX/TX mode change.
Table 19. UHF PLL specification
Parameter Minimum Typical /
Nominal
Maximum Unit / Notes
Start up settling time 5 ms
Phase error 4 deg. rms
Settling time +/– 93 MHz
GSM
PCN
525
450
800 ms
ms
ms
Sidebands offset from carrier
+/– 200 kHz
+/– 400 kHz
+/– 600 kHz
+/– 1.4 MHz...3.0
MHz
> 3.0 MHz
GSM
–80
–87
<–90
<–90
PCN
–74
–81
<–90
<–90
–60
–65
–70
–80
–80
dBc
dBc
dBc
dBc
dBc
UHF VCO
The UHF VCO uses a bipolar transistor as a active element and a
combination of a chip coil and a varactor diode as a resonance circuit.