RTPA5250-130 データシートの表示（PDF） - Raytheon Company
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RTPA5250-130 Datasheet PDF : 13 Pages
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Bias Considerations
for the RTPA5250-130
Figure 5
RTPA5250-130
3.3V UNII Band Power Amplifier
MMIC/Switch Module for WLAN
PRODUCT INFORMATION
The Raytheon RTPA5250-130 Integrated Power Amplifier features a patented active bias and bias shut down circuit
that eliminates two classic problems in power amplifiers. While pHEMT designs are known to offer superior
linearity, efficiency and ability to integrate switches, normal process variations normally require Digital to Analog
Convertors (DACs) to adjust device bias voltages. The RTPA5250-130 uses an on chip “Easy as PIE (Process
Invariant Efficient)” biasing circuit where the device current is held constant over manufacturing variations. The
PIE biasing also provides a solution for the other classic PA design problem of reducing device currents when not
transmitting. The amplifier current is automatically reduced to less than 10 milliamps when the chip enters the
receive mode. Since the WLAN is in the receive mode a high percentage of the time (like a cell phone), this is a
huge current and battery saving.
In practice, the externally provided negative bias, Vab, offers the possibility of the user selecting a wide range of
operating conditions and enables trade offs to be made between quiescent current, output power and gain. Figure
5 illustrates the change in Idd obtainable by changing Vab. Figure 6 shows the typical changes in power and gain
as Vab is varied from –4.50 V to –6.0 V.
RTPA5250-130 Idd vs. Vab
(XMT/RCV), Vdd, ANT1/2 = 3.3V, Vee = -6V (XMT to ANT2)
360
340
320
Idd
300
280
260
Figure 6
240
-6.5
-6.0
-5.5
-5.0
-4.5
-4.0
Vab (V)
RTPA5250-130 Gain and P1dB vs. Vab
(XMT/RCV), Vdd, ANT1/2 = 3.3V, Vee = -6V (XMT to ANT2)
45.0
40.0
35.0
30.0
Gain
P1dB
25.0
20.0
www.raytheonrf.com
15.0
-6.5
-6.0
-5.5
-5.0
Vab (V)
Characteristic performance data and specifications are subject to change without notice.
Revised January 25, 2002
Page 6
-4.5
-4.0
Raytheon RF Components
362 Lowell Street
Andover, MA 01810
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