MGCT04/KG/LH1T Ver la hoja de datos (PDF) - Zarlink Semiconductor Inc
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MGCT04/KG/LH1T Datasheet PDF : 12 Pages
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MGCT04
Transmit Circuit for TDMA/AMPS and CDMA/AMPS
Preliminary Information
Features
• Dual RF Ports for 900MHz and 1900MHz
• AGC Amplifier with 90dB of Variable Gain, Fully
Compensated for Temperature
• On-chip Active Filter. Removes the
Requirement for External IF SAW Filter
• High Power 900MHz and 1900MHz Output
Stages
• Quadrature Modulator
• Small Scale MLF Package
Applications
• Transmit Modulator and Up-converter in TDMA/
AMPS Mobile Phones
• Transmit Up-converter in CDMA/AMPS Mobile
Phones
The MGCT04 circuit is designed for use in dual
band, dual mode cellular 900MHz/PCS1900MHz
DS5424
ISSUE 1.1
Ordering Information
MGCT04/KG/LH1S
MGCT04/KG/LH1T
March 2001
mobile phones. It can be used for both TDMA/AMPS
or CDMA/AMPS systems. The MGCT04 is
compatible with baseband and mixed signal interface
circuits from Zarlink Semiconductor and other
manufacturers.
System costs have been kept to a minimum by
removing the requirement for an additional SAW filter
in the transmit IF path. The AGC has been split
between RF and IF sections to reduce noise and a
low pass filter has been included before the IF
variable gain amplifier to remove spurious products
produced in the modulator.
Q IN 13
Q IN 14
I IN 15
I IN 16
÷2/4 AND
PHASE
SHIFT
DIV 7
OUT
÷8
VCO
BUFFER
CP2
8
CP1
23
CP0
5
CONTROL LOGIC
POWER CONTROL
IF VGA
LO 2GHz
19
UHF
OSCILLATOR
INPUT SELECT
ALL PASS
PHASE
SHIFT
NETWORK
SSB MIXER
OSC
BUFFER
VREF
9
VHF OSC IN
BIAS
BUFFER 10
VHF OSC BIAS
VGA CONTROL
22
AGC
LO 1GHz
21
RF VGA
1900 MHz
OUTPUT DRIVER 27 RF190
26 RF190
28 RFDEG1
1 RFDEG2
900 MHz
OUTPUT DRIVER
3 RF900
2 RF900
Figure 1 - MGCT04 Block Diagram
1
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