Motorola A860 Service Manual download pdf (Page 22)

22 June 07, 2004

Theory of Operation A840

Phase-locked loop circuits:

• PLL#1 and an on-chip VCO supports cdma2000 TX modes

•PLL#2

Supports EGSM RX & TX, DCS RX &TX, and CDMA2000 RX modes using an

external VCO

Supports gpsone using the RFR6000 on-chip VCO

Transceiver LO generation and distribution circuits

• EGSM-900 RX and TX

• DCS-1800 TX and RX

• Cellular-TX

•PCS- TX

Analog support functions

• Reference signal of the MSM transmit DACs

• Transmit gain control

• Bias control

• Digital Interfaces

• 3 –line serial bus interface ( SBI)

• Dedicated RF_ON ( TX_ON) control line

The device is fabricated using an advanced SiGe BiCMOS process that accommo-

dates high-frequency, high-precision analog circuits as well as low-power CMOS

functions. Designed to operate with 2.7 to 3.0 Volt power supplies, it is compatible

with single-cell Li-Ion batteries.

RTR6300 is available in a small, thermally efficient package (48 BCCP)

RFR6000 Overview

The RFR6000 is an RF-to-Baseband receiver IC, an integral component of QUAL-

COMM’s radioOne

Zero-IF chipset. All radioOne ICs are highly integrated and

fulfill specific functions; functional requirements are partitioned between the ICs

to yield complete, optimal transceiver implementations. Overall radioOne perfor-

mance depends on the combined, complementary performance of all the ICs in the

chipset.

The RFR6000 IC provides the zero-IF receiver signal path, from RF to analog

Baseband, for multi-band, multi-mode handsets including combinations of the

following:

Bands:

• Cellular bands

•PCS bands

• GPS band

Modes:

•AMPS-FM

• CDMA (known as IS-95, cdmaOne, IS-98, cdma2000, 1x EV-DO)

•gpsOne TM

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Motorola A860 Service Manual Page 22

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