RFMD RF9908

RF9908
6
CDMA/FM UPCONVERTER/BPSK MODULATOR
Typical Applications
• CDMA/FM Cellular Systems
• Commercial and Consumer Systems
• Supports Dual-Mode AMPS/CDMA
• 3-Cell Battery-Operated Systems
• Supports Dual-Mode TACS/CDMA
Product Description
-A-
0.018
0.014
6
0.196
0.189
0.050
0.157
0.150
0.244
0.229
8° MAX
0° MIN
0.034
0.016
Optimum Technology Matching® Applied
Si BJT
Si Bi-CMOS
ü
GaAs HBT
GaAs MESFET
SiGe HBT
Si CMOS
Dimensions in mm
0.009
0.007
MIXERS
The RF9908 is a complete upconverter designed for
CDMA/FM cellular applications. The IC contains a double-balanced mixer stage and an output buffer amplifier
stage. This device may also be used to directly BPSK
modulate a carrier. The mixer is a Gilbert cell with emitter
degeneration resistors to provide high IP3. The output
stage is a class-B, push-pull configuration to reduce the
overall current and still provide a good 50Ω output match.
The unit operates at 3.6V and does not require any external matching components other than coupling capacitors.
This circuit is designed as part of the RFMD CDMA Chip
Set, consisting of a Transmit IF AGC Amp, this Transmit
Upconverter, a Receive LNA/Mixer, and a Receive IF
AGC Amp.
0.008
0.004
0.068
0.053
NOTES:
1. Shaded lead is Pin 1.
2. All dimensions are excluding
mold flash.
3. Lead coplanarity 0.005 with respect to datum "A".
Package Style: SOIC-8
Features
• Supports Dual Mode Operation
• +8dBm Input/Output Intercept Point
• Single 3.6V Power Supply
• Internally Matched Inputs and Outputs
IF+ 1
8 RF OUT
IF- 2
7 VCC
GND 3
6 GND
LO+ 4
5 LO-
• Buffered Output
• Double-Balanced Mixer
Ordering Information
RF9908
RF9908 PCBA
Functional Block Diagram
Rev A2 010720
CDMA/FM Upconverter/BPSK Modulator
Fully Assembled Evaluation Board
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
6-57
RF9908
Absolute Maximum Ratings
Parameter
Supply Voltage
Input RF Power
Operating Ambient Temperature
Storage Temperature
Parameter
Rating
Unit
-0.5 to 7.0
+6
-40 to +85
-40 to +150
VDC
dBm
°C
°C
Specification
Min.
Typ.
Max.
Caution! ESD sensitive device.
RF Micro Devices believes the furnished information is correct and accurate
at the time of this printing. However, RF Micro Devices reserves the right to
make changes to its products without notice. RF Micro Devices does not
assume responsibility for the use of the described product(s).
Unit
T=25°C, VCC =3.6V, RF=840MHz,
LO=970MHz, IF=130MHz
Overall
RF Output Frequency Range
Conversion Gain
Noise Figure
Output IP3
Output ACP
MIXERS
6
Output ALT
Output VSWR
Spurious Product Rejection
Condition
500 to 1500
0
14
+8
-54
MHz
dB
dB
dBm
dB
-75
dB
1.5:1
30
dBc
DC to 200
265
30
30
MHz
Ω
dB
dB
300 to 1700
-6 to 0
-30
30
2:1
MHz
dBm
dBm
dB
Over temperature and frequency
Referenced to a 1.23MHz in-band power.
(±885kHz offset)
Referenced to a 1.23MHz in-band power.
(±1.98MHz offset)
50Ω
Referenced to RF output
IF Input
IF Frequency
Differential Input Impedance
IF to RF Output Isolation
IF to LO Isolation
LO Input
LO Frequency Range
LO Level
LO to RF Output Leakage
RF to LO Isolation
LO Input VSWR
-20
50Ω
Power Supply
Voltage
Current Consumption
6-58
3.6±5%
18
V
mA
Rev A2 010720
RF9908
Pin
1
Function
IF+
Description
Interface Schematic
Balanced IF Input Pin. This pin is internally DC biased and should be
DC blocked if connected to a device with a DC level present. For singleended input operation, one pin is used as an input and the other IF
input is AC coupled to ground. The balanced, as well as single-ended,
input impedance is 265Ω.
IF+
IF-
BIAS
IFGND
4
LO+
5
6
7
LOGND
VCC
8
RF OUT
Same as pin 1, except complementary input.
See pin 1.
Ground connection. Keep traces physically short and connect immediately to ground plane for best performance.
Balanced LO Input Pin. This pin is internally DC biased and should be
DC blocked if connected to a device with a DC level present. For singleended input operation, one pin is used as an input and the other LO
input is AC coupled to ground. The balanced, as well single-ended,
input impedance is 50Ω.
Same as pin 4, except complementary input.
LO+
LO-
BIAS
See pin 4.
Same as pin 3.
6
Supply Voltage pin. External bypassing is required. External RF, LO,
and IF bypassing is required. The trace length between the pin and the
bypass capacitors should be minimized. The ground side of the bypass
capacitors should connect immediately to ground plane.
RF Output Pin. This pin is internally DC blocked. The output impedance
is 50Ω.
MIXERS
2
3
RF OUT
Application Schematic
1 nF
IF+
1
RF OUT
8
VCC
1 nF
IF-
2
7
3
6
4
5
100 pF
100 nF
100 pF
LO+
100 pF
Rev A2 010720
6-59
RF9908
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
P1
P1-1
NC
T1
1:4
IF IN
J1
1
VCC
2
GND
3
9908400 Rev -
C1
2.2 nF
C3
8 pF
C2
2.2 nF
50 Ω Microstrip
1
8
2
7
3
6
4
5
C6
47 pF
C7
100 nF
RF OUT
J3
P1-1
50 Ω Microstrip
C4
10 nF
6
LOC5
10 nF
MIXERS
Evaluation Board Layout
Board Size 1.4” x 1.4”
Board Thickness 0.031”, Board Material FR-4
6-60
Rev A2 010720