Vhf Pll; Vhf Vco + Buffer - Nokia 9000i Service Manual

After Sales
Technical Documentation
Parameter
Output voltage
Harmonics
Control Voltage Range
Nominal Voltage for center
frequency
Control Sensitivity
Frequency stability,
vs. temperature
vs. supply voltage
vs. load
vs. aging
Operating temperature range
Load impedance: resistive
part art
parallel capacitance

VHF PLL

The VHF PLL consists of the VHF VCO, PLL integrated circuit and loop
filter. The output signal is used for the 2nd (and 3rd in PCN) mixer of the
receiver and for the I/Q modulator of the transmitter.
Parameter
Start up settling time
Phase error
Sidebands
+/– 200 kHz
+/– 400 kHz
+/– 1 MHz
+/– 2 MHz
+/– 3 MHz
> 4 MHz

VHF VCO + buffer

The VHF VCO uses a bipolar transistor as a active element and a
combination of a chip coil and varactor diode as a resonance circuit. The
buffer is combined into the VCO circuit so, that they use same collector
current.
Amendment 1 04/97
Table 16. VCXO specification
Minimum Typical /
Nominal
1.3
0.25
12
–20
2
Table 17. VHF PLL specification
Minimum Typical /
Nominal
GSM
–75
–84
<–85
<–85
<–85
<–85
(continued)
Maximum
1.7 2.0
–5
4.45
2.2
16 22
10
1
0.1
1
70
20
Maximum
5
1
PCN
–75 –70
–84 –70
–75 –70
<–80 –75
–85 –80
–85 –80
RAE/RAK–1N
RF
Unit / Notes
Vpp,
sine wave for PLLs
dBc
V
V
ppm/V
ppm, –25...+70
deg.C
ppm, 4.5 V +/– 5 %
ppm, load +/– 10 %
ppm, year
deg. C
kohm
pF
Unit / Notes
ms
deg., rms
dBc
dBc
dBc
dBc
dBc
dBc
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