0.5 W High Gain Driver Amplifier
Avago Technologies’ MGA-31689 is a 0.5 W, high Gain,
high performance Driver Amplifier MMIC, housed in a
standard SOT-89 plastic package. The device required
simple matching components to achieve optimum per-
formance within specific 100 to 200 MHz bandwidth.
MGA-31689 is especially ideal for wireless infrastructure
applications that operate within the 1.5 GHz to 3 GHz
frequency range. With high IP3 and low noise figure, the
MGA-31689 may be utilized as a driver amplifier in the
transmit chain and as second or third stage LNA in the re-
ceive chain. For optimum performance at lower frequency
from 450 MHz to 1500 MHz, MGA-31589 is recommended.
MGA-31689’s high gain and high linearity features are
achieved through the use of Avago Technologies’ propri-
etary 0.25 Pm GaAs Enhancement-mode pHEMT process.
Pin connections and Package Marking
x ROHS compliant
x Halogen free
x High linearity at low DC bias power 
x High Gain
x Low noise figure
x High OIP3
x Advanced enhancement mode PHEMT Technology
x Excellent uniformity in product specification
x SOT-89 standard package
At 1900 MHz, Vdd = 5 V, Idd = 168 mA (typical) at 25° C
x OIP3 = 44.9 dBm
x Noise Figure = 1.9 dB
x Gain = 18.1 dB
x P1dB = 27.6 dBm
x IRL = 14.0 dB, ORL = 11.5 dB
1. The MGA-31689 has a superior LFOM of 15.5. Linearity Figure of Merit
(LFOM) is essentially OIP3 divided by DC bias power.
Input GND Output
Output GND Input
Top View: Package marking provides orientation and identification
“16” = Device Code
“X” = Date Code character indentifies month of manufacturing
Attention: Observe precautions for
handling electrostatic sensitive devices.
ESD Machine Model = 150 V
ESD Human Body Model = 650 V
Refer to Avago Application Note A004R:
Electrostatic Discharge, Damage and Control.
RF IN C
Figure 1. Simplified Schematic diagram