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CDMA Chip Set

cdma The following chip set creates a radio solution for Dual Band CDMA/AMPS handsets. Some of these components will also work well in single band CDMA applications, including CDMA-1900, CDMA-1700, and CDMA-800.

chipset block diagram

ATF-38143 MGA-72543 QCPM-9804 HPMX-7201 HPMX-7202 HPMX-7202 HPMX-7201 QCPM-9804 MGA-72543 ATF-35143 HPMX-7102 HPMX-7102 ATF-38143

  • Chipset is designed for dual-band handsets
  • Optimized operation for single cell Li-Ion battery (3.6V)
  • Small Size
    • On-chip control function eliminates external control circuits
    • MultiPak (Multilayer Substrate Package PCB) technology used for dual-band PAM, matching components, control functions in package
    • SOT-343 LNA: smallest LNA available with on-chip Bypass switch
    • Migrating to BCC packages in 00
  • Low Power Consumption
    • Variable IIP3 Receiver (LNA and Downconverter) allows to minimize drawing current
    • LNA Bypass state consumes no current
    • PA efficiency optimized for medium power (16dBm), Low IQ (quiescent current) for lower power state
    • Tx Driver amplifier uses adaptive biasing
  • High Receiver Sensitivity
    • Split LNA architecture allows to use Low Noise PHEMT technology (either PHEMT LNA or Disc PHEMT)
    • Tx chain architecture with split-band filtering (HPMX-7202) and gain distribution minimizes Rx band noise
  • Low Cost
    • Extensive use of lowest-cost Silicon technology except LNA ( GaAs PHEMT)
    • using high-volume industry-standard packages (SOT-343, TQFP and BCC) for RFIC

MGA-72543 Step Gain LNA with Bypass Switch

Incorporated functions:
Low Noise Amplifier
adjustable bias allowing selectable linearity and stepped gain (for use as driver amplifier)
on chip bypass switch to reduce current and boost dynamic range in the presence of a large input signal
Key specs:
3 Volt, 20 mA nominal operation (5 uA with switch closed)
LNA: NF=1.5 dB, Ga=14 dB, IP3i=+10.5 dBm
switch: IL=2.5 dB, IP3i=+295 dBm
Use
LNA for CDMA handsets (CDMA 1900, CDMA 800, dual band dual mode, dual band tri-mode)
Step Gain Driver Amplifier for CDMA handsets (CDMA 1900, CDMA 800, dual band dual mode, dual band tri-mode)
Modeling information
Beta Release of MGA-72543 ADS Behavioral Model

ATF-35143 Low Noise PHEMT

Incorporated functions:
discrete psuedomorphic high electron mobility transistor
Use:
general purpose device (low noise amplifier for CDMA PCS handsets)

Preliminary: HPMX-7102 CDMA/AMPS Dual-Band Dual-Mode Downconverter

Incorporated functions:
separate LNA-mixer chains for PCS, cellular and AMPS
Use:
IS-95 Dual-Band Triple-Mode (AMPS/Cellular-CDMA/PCS-CDMA) handsets

Preliminary: HPMX-7201 CDMA/AMPS Dual-Band Dual-Mode Upconverter/Driver Amplifier

Incorporated functions:
PCS-CDMA chain: upconverter, RF variable gain driver amplifier with adaptive biasing, band select switch
AMPS chain: single sideband upconverter, driver amplifier
Use:
IS-95 Dual-Band AMPS/PCS CDMA handsets

Preliminary: HPMX-7202 CDMA/AMPS Dual-Band Tri-Mode Upconverter/Driver Amplifier

Incorporated functions:
PCS-CDMA chain: upconverter, RF variable gain driver amplifier with adaptive biasing, band select switch
Cellular chain: 2 upconverters and driver amplifiers; mode pin for toggling
Use:
IS-95 Dual-Band Triple-Mode (AMPS/Cellular-CDMA/PCS-CDMA) handsets

Preliminary: QPMX-9804 Cellular-CDMA/PCS-CDMA/AMPS Dual-Band Tri-Mode Power Amplifier Module

Incorporated functions:
PCS and Cellular Power Amplifiers, PCS and Cellular driver amplifiers, power control circuitry and dynamic bias control
Use:
Dual-Band CDMA handsets, Wireless Data terminals, WLL, Base Station Driver
Future additions to this chipset include:

CDMA IF VGA/ modulator

CDMA IF VGA/ demodulator

For more information on these products, please e-mail us
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this page last updated: 1 October 1999