Nokia 9000i - Vhf Pll; VHF VCO + Buffer

After Sales
Technical Documentation
RAE/RAK–1N
RF
Page 3– 23
Amendment 1 04/97
Table 16. VCXO specification (continued)
Unit / NotesMaximumTypical /
Nominal
MinimumParameter
Output voltage 1.3 1.7 2.0 Vpp,
sine wave for PLLs
Harmonics –5 dBc
Control Voltage Range 0.25 4.45 V
Nominal Voltage for center
frequency
2.2 V
Control Sensitivity 12 16 22 ppm/V
Frequency stability,
vs. temperature
vs. supply voltage
vs. load
vs. aging
10
1
0.1
1
ppm, –25...+70
deg.C
ppm, 4.5 V +/– 5 %
ppm, load +/– 10 %
ppm, year
Operating temperature range –20 70 deg. C
Load impedance: resistive
p
art
2 kohm
art
parallel capacitance
20 pF
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.
Table 17. VHF PLL specification
Parameter Minimum Typical /
Nominal
Maximum Unit / Notes
Start up settling time 5 ms
Phase error 1 deg., rms
Sidebands
+/– 200 kHz
+/– 400 kHz
+/– 1 MHz
+/– 2 MHz
+/– 3 MHz
> 4 MHz
GSM
–75
–84
<–85
<–85
<–85
<–85
PCN
–75
–84
–75
<–80
–85
–85
–70
–70
–70
–75
–80
–80
dBc
dBc
dBc
dBc
dBc
dBc
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.