Maximum Ratings; Power Distribution Diagram; Regulators - Nokia 9000i Service Manual

After Sales
Technical Documentation

Maximum Ratings

The maximum battery voltage during the transmission should not exceed
8.5 V. Higher battery voltages may destroy the power amplifier. During
charging this will be quaranteed by hardware based limiting which has
maximum value 7.6 +/–0.3 V. However, the maximum voltage of the
Li–Ion battery will be almost 8.5 V when the battery is full. The charging
algorithm ensures that the voltage never exceeds this limit.

Power Distribution Diagram

GSM/PCN:
All currents in the power distribution diagram are peak currents. Activity
percentages are in CALL–mode 24.6 % for RXPWR, 15.8 % for TXPWR
and 100 % for SYNTHPWR. In IDLE–mode activities are 0.4 %, 0.0 %
and 1.77 % respectively. The current of each block is controlled
independently, for example TXPWR and RXPWR are not on at the same
time.

Regulators

There is one regulator IC in the RF unit. The regulator IC CRFCONT is an
RF power supply circuit basically intended for digital handportable phones.
It has 8 separate linear regulators and power on/off switches for
RF–circuitry. Each regulator can be individually disabled and enabled and
also has a voltage reference output.
See more details on Figure 3 and Figure 4.
Amendment 1 04/97
RAE/RAK–1N
RF
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