Motorola V2260 Instruction Manual download pdf (Page 17)

17 © 2000 Motorola, Inc.

THEORY OF OPERATION

CDMA 800/AMPS-V2260, T2260

CDMA Dual Mode 800-1900-V2267, T2267

Cellular Subscriber Sector

Theory of Operation

AMPS

Reciever Circuitry

RF enters the phone via the internal antenna,

A1. The received RF signal is routed through

monoblock duplex filter FL13, and FL12.

The RF signal is routed through additional

gain and filtering stages,Q40, , FL40, and

Q40. The received signal then enters the

Mixer U120.

The local oscillator input to the Filter FL120

is a 978-1004 MHz VCO, U680 controlled

by the IF/Synthesizer IC U700. The 109.65

MHz mixer output is routed through FL201

into the IFIC U700.

Transmitter Circuitry

The modulated TX Offset VCO signal is

mixed with the 978-1004 MHz local oscil-

lator signal in TX Mixer U600 to produce an

823-849 MHz transmit signal. This signal

passes through filter FL600 and voltage con-

trol attenuator thru U600 which controls the

TX output power. Then the TX signal is

amplified by U430. The output passes

through the mono-block duplex filter FL12

and FL13 to RF switch the internal antenna

accessory connector.

CDMA PCS

Reciever Circuitry

RF enters the phone via the internal antenna,

A1. The received RF signal is routed through

monoblock duplex filter FL13 and FL10.

Then the RF signal is routed through a direct

path through additional gain and filtering

stages,Q20, FL20. The received signal then

enters the Mixer Q100.

The local oscillator input to the mixer is dou-

ble of 1019-1050 MHz VCO, U600 con-

trolled by the IF/Synthesizer IC U700. The

109.8 MHz mixer output is routed through

FL200 into the IFIC U700.

Transmitter Circuitry

The modulated TX Offset VCO signal is

mixed with the 1019-1050 MHz local oscil-

lator signal in TX Mixer U600 to produce an

1850-1910 MHz transmit signal. This signal

passes through filter FL601. Then the TX

signal is amplified by U832 and passes

through Tx coupler. The output passes

through the mono-block duplex filter FL10

to FL13 to the internal antenna.

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