100-M0167X2
3 of 21
GMS Inc. doing business as Cobham Tactical Communications and Surveillance
www.cobham.com/tcs
TABLE OF CONTENTS
1.
CAUTIONS AND WARNINGS ...................................................................................................................................................... 5
1.1.
ELECTROMAGNETIC RADIATIONS ................................................................................................................................................. 5
1.2.
SUPPLY VOLTAGE AND CURRENT .................................................................................................................................................... 5
1.3.
PA ENABLE (Fast Switching) ................................................................................................................................................................. 5
1.4.
RF LOAD TERMINATION (50 Ohm)ΩΩ ....................................................................................................................................... 5
1.5.
HEATSINK .......................................................................................................................................................................................................... 6
1.6.
RF OVERDRIVE ............................................................................................................................................................................................... 6
1.7.
OVER TEMPERATURE AUTOMATIC SHUTDOWN.................................................................................................................. 6
1.8.
POWER MEASUREMENT .......................................................................................................................................................................... 6
2.
ABSOLUTE MAX RATINGS ............................................................................................................................................................ 7
3.
SPECIFICATIONS ................................................................................................................................................................................ 7
4.
POWER AMPLIFIER FEATURES ................................................................................................................................................. 9
4.1.
MODE OF OPERATIONS ........................................................................................................................................................................... 9
4.1.1.
HIGH LINEARITY MODE (OR HIGH MER MODE) .......................................................................................................... 9
4.1.2.
HIGH EFFICIENCY MODE (OR LOW CURRENT MODE) ............................................................................................ 9
4.2.
PA ENABLE (Fast Switching Capable) ............................................................................................................................................. 9
4.3.
VSWR, RF OVERDRIVE AND OVER-TEMERATURE PROTECTION CIRCUITS ...................................................... 9
5.
OPERATIONAL INSTRUCTIONS ............................................................................................................................................ 10
5.1.
EXTERNAL CONNECTIONS ................................................................................................................................................................. 10
5.2.
CONNECTING & DISCONNECTING THE POWER AMPLIFIER .................................................................................... 11
5.3.
APPLICATION EXAMPLES ................................................................................................................................................................... 11
5.3.1.
BASIC CONFIGURATION ........................................................................................................................................................... 11
5.3.2.
VEPA-2W / VMT COMBINATION .......................................................................................................................................... 13
5.4.
USING A TRANSMITTER / PA COMBINATION .................................................................................................................... 13
5.4.1.
The old FM approach .................................................................................................................................................................... 13
5.4.2.
The NEW Digital Modulation approach ........................................................................................................................... 14
6.
TYPICAL POWER AMPLIFIER PERFORMANCES ......................................................................................................... 16
6.1.
GAIN @ 2W COFDM Output .............................................................................................................................................................. 16
6.2.
Current @ 2W COFDM Output, 12 Vdc ....................................................................................................................................... 18
6.3.
MER @ 2W COFDM Output ................................................................................................................................................................. 19
6.4.
Small Signal S-Parameter (High Efficiency Mode) .............................................................................................................. 20
LIST OF TABLES
Table 1 – ABSOLUTE MAX RATINGS ............................................................................................................................................. 7
Table 2 – General Specifications: ..................................................................................................................................................... 7
Table 3 – Frequency Specific Specifications: .......................................................................................................................... 8