This Application Note describes the performance of the Avago Technologies AT-41511 low cost low noise bipolar transistor. The AT-41511 is used in a two stage low noise amplifier in the 800 to 1000 MHz frequency range. The amplifier is designed around the catalog S Parameters at a VCE of 8 volts and a collector current, IC, of 10 mA. Although designed for operation at a VCE of 8 volts, the amplifier has very good performance as a low noise amplifier at collector voltages as low as 3 volts. The amplifier also provides a means of generating moderate power at a VCE of 5.5 volts.
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