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PDF RF2942 Data sheet ( Hoja de datos )
| Número de pieza | RF2942 | |
| Descripción | UHF QUADRATURE MODULATOR AND TRANSMITTER | |
| Fabricantes | RF Micro Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RF2942 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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Typical Applications
• 915MHz ISM Band Products
• Digital Communications
RF2942
UHF QUADRATURE MODULATOR
AND TRANSMITTER
• Quadrature Modulation
• Portable Battery-Powered Equipment
Product Description
The RF2942 is an integrated power amplifier and quadra-
ture modulator IC. The quadrature modulator is driven
with a single-ended local oscillator (LO) source. The
quadrature phase generation of the LO is accomplished
using an internal passive network tuned for twice the
operating frequency. The LO frequency is at twice the RF
frequency to avoid interfering with an external synthe-
sizer.
Optimum Technology Matching® Applied
Si BJT
GaAs HBT
GaAs MESFET
Si Bi-CMOS
InGaP/HBT
SiGe HBT
Si CMOS
9GaN HEMT
SiGe Bi-CMOS
4 3 12
LO IN+ 14
LO2 OUT 15
Σ÷2
+45°
-45°
21
9 RF OUT
2 PLCS
-A-
4.00 SQ.
0.25 C A
1.00
0.85
2.00 TYP
0.25 C B
2 PLCS
0.80
0.65
0.05 C
0.05
0.01
0.20 C B
2 PLCS
2 PLCS
0.20 C A
Dimensions in mm.
12°
MAX
3.75 SQ.
-B-
1.88 TYP
-C- SEATING
PLANE
0.60
0.24
TYP
0.10 M C A B
0.35
0.23
Shaded lead is pin 1.
0.65
0.30
4 PLCS
1.85
1.55
SQ.
0.23
0.13
4 PLCS
0.75
0.65 0.50
Package Style: QFN, 16-Pin, 4x4
Features
• 2.0V to 3.6V Power Supply
• 902MHz to 928MHz Frequency Range
• 200mW Output Power
• Low LO Input Level
• Low Broadband Noise Floor
• Small Footprint
Ordering Information
RF2942
UHF Quadrature Modulator and Transmitter
RF2942 PCBA Fully Assembled Evaluation Board
Functional Block Diagram
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Rev A4 040115
11-195
1 page  
Theory of Operation
Modulator
The modulator is a direct conversion double balanced
quadrature mixer architecture. The local oscillator sig-
nal is buffered then split with internal phase shifters
that are optimized for twice the operating frequency.
The LO buffer provides isolation from load changes
that may occur as the power amplifier section is turned
on and off. In addition, the LO buffer may be left on
when the transmit section is turned off to prevent load
pulling of the external oscillator, by holding TX EN low
and leaving the bias on VCC1.
The baseband I and Q pins are connected to the inter-
nal mixer bias, therefore it is recommended that the
modulation signal be DC-blocked if a similar external
reference voltage cannot be provided. The baseband
drive may be either single-ended with the complemen-
tary input AC-grounded with a capacitor or driven dif-
ferentially.
Power Amplifier
The power amplifier requires matching on the output
(RF OUT) and the interstage transistor (PA VCC).
RF2942
Rev A4 040115
11-199
5 Page 
Image Suppression versus I/Q Amplitude Over
Temperature
0.0
-40.0°C
-5.0 25.0°C
85.0°C
-10.0
-15.0
-20.0
-25.0
-30.0
-35.0
-40.0
-45.0
-50.0
250.0 300.0 350.0 400.0 450.0 500.0 550.0 600.0 650.0 700.0 750.0
I/Q Amplitude (mVP-P)
0.0
-1.0
-2.0
-3.0
-4.0
-5.0
-6.0
-7.0
-8.0
-9.0
-10.0
-11.0
-12.0
2.0
LODiv2 Out versus VCC Over Temperature
-40.0°C
25.0°C
85.0°C
2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6
VCC (V)
LODiv2 Out versus LO Frequency Over Temperature
0.0
-40.0°C
-1.0 25.0°C
85.0°C
-2.0
-3.0
-4.0
-5.0
-6.0
-7.0
-8.0
-9.0
-10.0
-11.0
-12.0
1800.0
1810.0
1820.0
1830.0
1840.0
LO Frequency (MHz)
1850.0
1860.0
Rev A4 040115
RF2942
Image Suppression versus I/Q Phase Over Temperature
0.0
-10.0
-40.0°C
25.0°C
85.0°C
-20.0
-30.0
-40.0
-50.0
-60.0
-70.0
80.0
85.0 90.0
I/Q Phase (degree)
95.0
100.0
LODiv2 Out versus LO Amplitude Over Temperature
0.0
-40.0°C
25.0°C
85.0°C
-2.0
-4.0
-6.0
-8.0
-10.0
-12.0
-15.0
-12.0
-9.0 -6.0
LO Amplitude (dBm)
-3.0
0.0
LODiv2 Out versus I/Q Amplitude Over Temperature
0.0
-1.0
-40.0°C
25.0°C
85.0°C
-2.0
-3.0
-4.0
-5.0
-6.0
-7.0
-8.0
-9.0
-10.0
-11.0
-12.0
250.0
375.0
500.0
625.0
I/Q Amplitude (mVP-P)
750.0
11-205
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RF2942.PDF ] | |
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