Characterization results

AN2048

12/13

7

Characterization results

As we can see from Figure 9, 10 and 11, we can achieve a minimum gain of 12 dB with an

input return loss better than 5 dB and a drain efficiency between 55% and 65% over the

frequency band 445

÷ 475 MHz.

Even so the output power can be controlled through Vgs, a minimum of 15 dB dynamic

transmitted power out and may extend the transmission range capability to more than 3

miles (depending on environment) as requested in some commercial products.

8

Feature characteristics

Other optional functions in which this application may be used are:

●

Equipment monitoring

●

CO/Methane/Fire detection

●

Security/Alarm services

●

Data logging

●

All VHF and UHF PMR portables

9

References

1.

"RF power amplifiers for wireless communications", Artech House

2.

"RF transistors meet wireless challenges" - Technical Editor - EDN magazine pag. 53 -

61, May 3, 2001 - www.ednmag.com.

3.

"PowerSO-10RF - The first true RF power SMD Package" - Application Note 1294 -

STMicroelectronics.

4.

"Understanding LDMOS device fundamentals" Application Note 1226 -

STMicroelectronics.

10

Revision history

Table 4.

Document revision history

Date

Revision

Changes

14-Oct-2004

1

Initial release

06-Feb-2008

2

Document reformatted no content change

PD54008L replaced by PD54008L-E