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Philips Semiconductors                                                1880 MHz PA Driver with BFG480W




                          1880 MHz PA Driver with BFG480W

                                              Application Note
                                                JL-9902v0


                                                   Author

                                              Jarek Lucek

                                                June 1, 1999


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




                                                  Abstract
                     th
BFG480W, the new 5 generation transistor from Philips Semiconductors, is well suited for PA driver applications
in AMPS, TDMA, CDMA and GSM systems. BFG80W's performance is superior at 1880 MHz, 3.6V applications.
Under CW mode, the part is capable of P1dB=20dBm, efficiency of over 40% and typical Gp of 15 dB. BFG480W
delivers 20 dBm of linear output power under TDMA with a typical G of 15 dB and efficiency of above 30%.
                                                                    p
Under CDMA mode, BFG480W delivers 19 dBm of linear output power with a typical G of above 15 dB and
                                                                                        p
efficiency of 30%.
Philips Semiconductors                                                             1880 MHz PA Driver with BFG480W



INTRODUCTION

BFG480W is Philips Semiconductors' 5th generation silicon bipolar RF wideband transistor in a
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 a high transition
frequency (fT > 20 GHz) at low sub 3 Volt supply voltages. This application notes describes BFG480W
performance at 1880 MHz operation under CW, 2 Tone, TDMA and CDMA conditions.


PERFORMANCE OVERVIEW

The table below summarises BFG480W's typical performance capabilities under different signal
conditions.

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

                 3.0 Volts            19               20             14.5             14.7              37              37
     CW          3.6 Volts            21               21             14.9             14.8              38              36
                 3.0 Volts            16              15.5             15              15.5              27              24
2Tone            3.6 Volts           17.5             16.5             16               16               27              22
                 3.0 Volts            19               19             14.5              15               35              34
TDMA             3.6 Volts           20.5              20              15              14.7              33              33
                 3.0 Volts           17.5             17.5             15              15.5              30              30
CDMA             3.6 Volts            19              18.5            15.5              16               30              27
Table 1:           BFG480W 1880 MHz PA driver performance summary

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

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