DC Characteristics

Power Distribution Diagram

All currents in the power distribution diagram are peak currents, unless otherwise noted. Activity percentages in SPEECH/DATA mode are 22.5 % for RXPWR, 15.8 % for TXPWR and 100 % for SYNTHPWR. In the IDLE mode, activities are 0.36 %, 0.0 % and 1.61 %, respectively. The operation of each block is controlled independently and, for example, TXPWR and RXPWR are not on at the same time.

The GX8 module is powered from the host PC. The PCMCIA interface includes two power supply pins. The voltage VCC available from these pins varies from 3.0 up to 5.25 V. The maximum current handling capability of each PCMCIA supply pin is 0.5 A. The voltage is regulated for all parts except for the PA. The PA supply can be cut off with a MOSFET switch on the BB side. The GX8 performance is optimized for 3.3 V operation voltage.

VCCP0WER (M0SFET)

VCCVCX0 P-(DC/DC)

Regulator 4.8 V

SYNTHPWR (MAD)

VHL0 1.5 mA

VCTCX0

VPLL 38 mA

UHF VC0 UHF Buffer VHFVC0 PLL IC

Regulator 3.0 V

1550uF

IF amplifier

PA-driver

M Power line < Control line

950 mA (peak, max power) 150 mA (average, max power)

Regulator 4.8 V

Power conrtol

3 mA

34 mA

VRX 38 mA

CRFRT

TXPWR RXPWR MAD

-C TXP MAD

Technical Documentation System Module

Regulators

There are three regulators in the RF unit. One regulates 4.8 V for the synthesizer. Another regulates 4.8 V for the CRFRT. These regulators regulate the 6 to 10—V output voltage of the DC/DC converters, located on the baseband side. The third regulator regulates the VCCPOWER to 3.0 V (typical value) for the LNA, IF-amplifier, and the PA-driver amplifier. One function of the regulators is to also enhance EMI isolation between different blocks.

The receiver (RX), synthesizer, and transmitter (TX) circuits can be switched ON and OFF separately. Switching sequence timing depends on the operation mode of the phone.

Control Signals

VXOENA

SYNTHPWR

RXPWR

TXPWR

TXP

Typical load current / mA

Notes

L

L

L

L

L

0.05

Leakage current

H

L

L

L

L

1.5

VCTCXO running

H

H

L

L

L

31.5

Synthesizers active

H

H

H

L

L

95

Reception

H

H

L

H

L

95

TX active

H

H

L

H

H

1048

Transmission

RF Characteristics

Item

Value

Receiver (RX) frequency band

935 ... 960 MHz

Transmitter (TX) frequency band

890 ... 915 MHz

Duplex spacing

45 MHz

Number of RF channels

124

Power class

5

Maximum output power

0.8 W (29 dBm)

Number of power levels

Parameter

Minimum

Typical / Target

Maximum

Unit / Notes

Max. output power

29

dBm

Max. output power tolerance (power control level 7)

+/- 2.0 +/- 2.5

dB, normal cond. dB, extreme cond.

Output power tolerance

+/- 3.0 +/- 4.0

dB, normal cond. dB, extreme cond.

Output power control step size

0.5

2.0

3.5

dB

System Module Technical Documentation

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