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Philips Semiconductors                                            800MHz PA Driver with BFG21W




                         800MHz PA Driver with BFG21W

                                          Application Note
                                            JL-9803v2


                                               Author

                                          Jarek Lucek

                                         November 8, 1998


                               Discrete Semiconductors - Mansfield
                                         171 Forbes Blvd.
                                       Mansfield, MA 02048




                                              Abstract
                    th
BFG21W, the new 5 generation transistor from Philips Semiconductors, is well suited for PA driver
applications in AMPS, TDMA, CDMA and GSM systems. BFG21W's performance is superior at 800MHz,
3.0V applications. Under CW mode, the part is capable of P1dB=25dBm, efficiency of 70% and Gp of 17dB.
BFG21W delivers 23dBm of linear output power under TDMA with Gp of 18dB and efficiency of over 50%.
Under CDMA mode, BFG21W delivers 19dBm of linear output power with G of 19 dB and efficiency of
                                                                           p
35%.
Philips Semiconductors                                                            800MHz PA Driver with BFG21W

INTRODUCTION

BFG21W is Philips Semiconductors' 5th generation silicon bipolar RF wideband transistor in
SOT343R plastic SMD package. The transistor delivers superior performance at frequencies
below 3 GHz. It is manufactured according to the double poly process and characterised by high
transition frequency (fT > 20 GHz) at low sub 3 Volt supply voltages. This application notes
describes BFG21W performance at 800MHz operation under CW, 2 Tone, TDMA and CDMA
conditions.


PERFORMANCE OVERVIEW

The table below summarises BFG21W performance capabilities under different modes of
operation.

                                    P1dB or Plinear*                          Gain**                      Efficiency***
System            Vsupply
                                        dBm                                    dB                               %
                                   Icq=10mA         Icq=20mA         Icq=10mA        Icq=20mA         Icq=10mA        Icq=20mA

                 3.0 Volts             24             24.5              18             18.2               66              68
     CW          3.5 Volts            24.5             25              18.8             19                60              63
                 3.0 Volts             19              19               19             19.5               43              41
2Tone            3.5 Volts            20.5            20.5             19.5            19.9               43              40
                 3.0 Volts             21              23              18.9            18.2               48              60
TDMA             3.5 Volts             23              24              19.4            18.8               52              57
                 3.0 Volts             17              19              18.8             19                33              39
CDMA             3.5 Volts            19.5             20              19.2            19.5               35              38
Table 1:           BFG21W 800MHz PA driver performance summary

*-    CW - load power @ P1dB
      2Tone - load power represents linear average power @ IMD levels reaching 

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