Application Note: PowerSO-10RF
The First True RF Power SMD Package
(AN1294)
|
 The
emerging standards in the telecom market call for new technologies
and products able to fulfil the high linearity requirements
of digital communication combined with low cost solutions
and high volume manufacturing capability. ST has introduced
a series of RF power transistors especially designed for
Base Station (BTS) applications across the frequency bands
380-512MHz and 806-860 MHz (TETRA) as well as all the main
1GHz Digital Cellular Standards: 925-960 MHz (GSM,GPRS,EDGE)
and 869-894MHz (IS-95,IS-54/136) etc. These products use
ST’s state-of-the-art LDMOS technology (LdmoST), housed
either in the conventional ceramic package types (SD57xxx
series) or in the PowerSO-10RF plastic package (PD57xxx
series). Handling plastic packages introduces new concepts
into RF amplifier design and manufacturing. ST is a pioneer
in this field suggesting innovat ive solutions to BTS manufacturers. |
The LdmoST family offers complete solutions from 2W up to 120W
Output Power,26-28V supply with operating frequencies up to 960MHz.
Customers wanting to design cost effective and high performance
BTS will certainly find a solution based on the LdmoST product
portfolio.
The SD57xxx series offer products from 30W to 120W in ceramic
packages,while the PD57xxx series offers all the Pout levels from
2W to 70W in PowerSO-10RF plastic package. Two lead configurations
are available for PowerSO-10RF.
The straight lead version (add “S ” suffix after P/N)
will allow direct mounting on heatsink through solder reflow.
The formed lead version is the first true high power SMD package
for RF applications. Different mounting methods are recommended
depending on the requested dissipated power (see application note
AN1294: PowerSO-10RF
The First True RF Power SMD Package).
From 2W,by direct mounting on copper foil on PCB, up to 18W,by
mounting on PCB with via holes.
Internal matching is now available in ceramic packages, to optimise
performance for the Cellular BTS standards. It will also be added
in PowerSO-10RF,to help customers designing broadband amplifiers
with significant cost reduction.
| PA Solutions and Demoboards |
 In
order to support customer design-in activities a new series
of demoboards are under development.They are specifically designed
for all telecom applications such as cellular BTS and PMR (Private
Mobile Radio)using the new family of LDMOS products in the PowerSO-10RF
plastic package.The first of this series is called DB-960- 70W,a
70 Watts amplifier using two PD57045S (45W LDMOS in PowerSO-10RF)
and especially designed to fulfil GSM900 BTS requirements with
a typical gain of 13dB,capable of withstanding 10:1 VSWR all
phases and with harmonics lower than –30 dBc. In addition
to its good RF performance, DB-960-70W will provide a unique
solution, which will allow a significant reduction in component
costs.
 |
Frequency range |
920-960MHz |
|
Gain at Pout =75W |
12.5dB min. |
|
1dB compression point |
>70W |
|
Gain flatness
|
+/-0.5dB |
|
Drain efficiency |
45%min |
|
Harmonics |
-30dBc max |
|
Spurious /10:1 VSWR |
-76dBc max |
|
IMD3 at Pout =75WPEP |
-25dBc max |
|
Order code |
DB-960-70W |
|
Samples + Datasheets |
Available now |
P/N |
Pout
(W) |
Vdd
(V) |
Gain
(dB) |
Frequency
Range
(MHz) |
Application |
on Board
RF Transistor |
| |
60
|
26
|
13
|
869-894
|
CDMA BTS
|
1X
PD57070-E
|
| |
80 |
26 |
13 |
869-894
|
CDMA BTS |
2X PD57045-E
|
| |
12
|
12 |
13 |
875-915
|
GSM-R BTS
|
1X PD55015-E
|
| |
60
|
26 |
13 |
925-960
|
GSM/EDGE BTS
|
1X PD57070-E
|
| |
70
|
26 |
13 |
925-960
|
GSM/EDGE BTS
|
2X PD57045-E
|
| |
90
|
26 |
12 |
925-960
|
GSM/EDGE BTS
|
2X PD57060-E
|
P/N |
Pout
(W) |
Vdd
(V) |
Gain
(dB) |
Frequency
(MHz) |
Range |
Application |
| DB-520-50W* |
50 |
13.2 |
13 |
450-20 |
Analog |
PMR |
| DB-175-50W* |
50 |
13.2 |
16 |
135-175 |
Analog |
PMR |
| DB-520-35W* |
35 |
13.2 |
13 |
450-520 |
Analog |
PMR /10W TETRA |
| DB-175-35W* |
35 |
13.2 |
16 |
135-175 |
Analog |
PMR /10W TETRA |
| DB-520-8W* |
8 |
7.2 |
10 |
450-520 |
5W |
TETRA |
* Under development |
