Obsolescence Notice
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convenience only.
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Zarlink’s obsolete products and
replacement product lists, please visit
http://products.zarlink.com/obsolete_products/
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
DS5424
ISSUE 1.1
March 2001
Ordering Information
MGCT04/KG/LH1S
MGCT04/KG/LH1T
Applications
•
•
Transmit Modulator and Up-converter in TDMA/
AMPS Mobile Phones
Transmit Up-converter in CDMA/AMPS Mobile
Phones
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.
The MGCT04 circuit is designed for use in dual
band, dual mode cellular 900MHz/PCS1900MHz
CP2
8
CP1
23
CP0
5
LO 2GHz
19
UHF
OSCILLATOR
INPUT SELECT
LO 1GHz
21
CONTROL LOGIC
1900 MHz
OUTPUT DRIVER
Q IN
Q IN
13
14
27
26
POWER CONTROL
RF190
RF190
RFDEG1
RFDEG2
RF900
RF900
÷
2/4 AND
15
16
PHASE
SHIFT
IF VGA
ALL PASS
PHASE
SHIFT
NETWORK
RF VGA
28
1
3
2
SSB MIXER
900 MHz
OUTPUT DRIVER
I IN
I IN
DIV
7
OUT
VCO
BUFFER
÷
8
OSC
BUFFER
V
REF
9
BIAS
BUFFER
10
VGA CONTROL
22
VHF OSC IN
VHF OSC BIAS
AGC
Figure 1 - MGCT04 Block Diagram
1
MGCT04
Preliminary Information
21
15
22
14
28
8
Note:
Corner Pads are connected
to ground
1
7
Figure 2 - Pin Connections - top view
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Signal Name
RF DEG2
RF 900B
RF 900
RF GND
CP0
VCO GND
DIV OUT
CP2
VHF OSC IN
VHF OSC BIAS
VCO V
CC
GND
Q IN
Q INB
I IN
I INB
V
CC
UHF V
CC
LO 2GHZ
GND UHF
LO 1GHZ
AGC
CP1
RF V
CC
RF GND
RF 1900B
RF 1900
RF DEG1
Function
Connection to external inductor to control gain of power amplifiers
Inverse output from 900MHz differential output driver
Output from 900MHz differential output driver
Ground to RF circuits
Control pin 0. See tables 2 & 3 for function
Ground for VHF oscillator
Output from VHF oscillator divided by 8
Control pin 2. See tables 2 & 3 for function
Input from external VHF oscillator
Switched bias voltage for external VHF oscillator
Positive supply to VHF oscillator
Ground
Q +input
Q -input
I +input
I -input
Positive supply
Positive supply to UHF LO input buffers
2GHz local oscillator input
Ground to UHF oscillator input buffers
1GHz local oscillator input
Control voltage for IF and RF variable gain amplifiers
Control pin 1. See tables 2 & 3 for function
Positive supply to RF circuits
Ground to RF circuits
Inverse output from 1900MHz differential output driver
Output from 1900MHz differential output driver
Connection to external inductor to control gain of power amplifiers
Table 1 - Pin Assignments
2
Preliminary Information
Absolute Maximum Ratings
Supply voltage (V
CC
)
Control input voltage
Storage temperature, T
STG
4V
-0.6V to V
CC
+ 0.6V
-55˚C to +125˚C
Operating temperature
Max Junction Temperature (T
J
)
MGCT04
-40˚C to 100˚C
150˚C
Electrical Characteristics
Test conditions (unless otherwise stated): Tamb = -30°C to +70°C, V
CC
= 2·7V to 3·6V. UHF LO level = -15dBm
(both bands), I, Q input = 1.4 volts p.p, test frequency = 849MHz (900 output) and 1910MHz (1900
output).These characteristics are guaranteed by either production test or design. They apply within the
specified ambient temperature and supply voltage ranges unless otherwise stated.
Value
Characteristics
Min.
Supply current
Sleep current
Standby mode
Standby Mode - Prescaler
disabled
Total supply current
Standby to operating mode
switching time
Logic inputs
Logic high voltage
Logic low voltage
Typ.
Max.
75
10
µA
mA
mA
mA
µs
All circuits off
See Tables 4 and 5
Pin 7 connected to V
CC
Maximum power PCS mode
Units
Conditions
8
4
118
160
10
V
CC
-0.6
0
V
CC
0·8
V
V
Table 2 - DC Characteristics
Value
Characteristics
Min.
I and Q modulator
I and Q input voltage level
I and Q common mode voltage
I and Q differential input
resistance
I and Q input bandwidth
IF Vector offset
SSB rejection
VHF oscillator input and divider
Input drive level
VHF oscillator bias voltage
Output level from prescaler
Prescaler divide ratio
400
8
22
40
1.2
70
mVrms
V
mVpp
6pF load
Drive output for synthesiser
From external VHF osc. via
matching network
13.5
2.5
25
30
1.0
1.4
1.2
2.0
Vpp
V
k
Ω
MHz
dB
dB
Pout = +8dBm
Pout = + 8dBm
Differential
Typ.
Max.
Units
Conditions
Table 3 - AC Characteristics
3
MGCT04
Preliminary Information
Value
Characteristics
Min.
Variable gain amplifiers
IF amp. operating frequency range
RF amp. operating frequency
range
Overall gain control range
Control voltage for minimum gain
Control voltage for maximum gain
AGC control voltage slope
SSB mixer and UHF oscillator
inputs
Cellular band LO input level
PCS band LO input level
Cellular band local oscillator input
frequency. (LO 1GHz)
PCS band local oscillator input
frequency (LO 2GHz)
900MHz RF output stage
-15
-15
850
1500
-10
-10
-5
-5
1100
2150
33
50
750
84
0.1
2.6
60
90
200
2000
Typ.
Max.
Units
Conditions
MHz
MHz
dB
V
V
dB/V
Voltage gain
dBm
dBm
MHz
MHz
From external UHF osc. via
matching network
From external UHF osc. via
matching network
Specifications assume 50 ohm
load driven via a matching network
(Fig. 6)
824
+8
-66
-45
-90
849
+19
-52
-30
-60
+14
-128
-123
121
+19
MHz
dBm
dBc
dBc
dBc
dBm
dBm/
Hz
dBm/
Hz
Note 1
Pout = +3dBm Vcc = 3V
Pout = +8dBm, Offset = 30kHz
Vcc = 3V
Pout = +8dBm, Offset = 60kHz
Vcc = 3V
Note 2
At duplex frequency, offset 45MHz
Pout = +3dBm
ftx = 849 MHz Pout = +8dBm
RF amplifier operating frequency
range
Output power
ACPR (CDMA)
ACPR (TDMA)
Output power AMPS
Receive band noise
Receive band noise
(869 - 894MHz)
Spurious Outputs
LO Leakage
Image Rejection
Other Spurii
+10
-30
-30
-20
-20
-20
dBc
dBc
dBm
Pout = +8dBm
Pout = +8dBm
Note 3
Table 3 - AC Characteristics (continued)
4
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