Uhf Vco Buffers; Pll Circuit - Nokia 9000i Service Manual

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Technical Documentation

UHF VCO buffers

The UHF VCO output signal is divided into the 1st mixer of the receiver
and the upconversion mixer of the transmitter. The UHF VCO signal is
amplified after division. There is one buffer for TX and one for RX.
Parameter
Supply voltage
Supply current
Frequency range
Input power
Harmonics
Output amplitude

PLL Circuit

The PLL is Philips UMA1018 in GSM and National LMX2331 in PCN.
The circuit is a dual frequency synthesizer including both the UHF and
VHF synthesizers.
Table 21. PLL UMA1018 (UMA1020) specification
Parameter
Supply voltage
Supply current GSM
PCN
Principal input freq. GSM
PCN
Auxiliary input freq. GSM
PCN
Input reference frequency
Input signal level GSM
PCN
Amendment 1 04/97
Table 20. UHF VCO buffer specification
Minimum Typical /
Nominal
4.2 4.5
5.5
See UHF VCO specification
700
Minimum Typical /
Nominal
2.7
12.1
500
200
20
20
3
50
–10
–15
500
Maximum
4.8
6.5
–3
–10
Maximum
5.5
8.5
1200
2000
300
510
40
500
4
4
RAE/RAK–1N
RF
Unit / Notes
V
mA
MHz
dBm
dBc
mVrms / 1 kohm
Unit / Notes
V
mA
mA
MHz, Vdd = 4.5 V
MHz, Vdd = 3.0 V
MHz, Vdd = 4.5 V
MHz, Vdd = 3.0V
MHz, Vdd = 4.5 V
mVrms
dBm main divider
dBm aux. divider
mVrms ref. divider
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