I want to use a 3.3 volt supply to power a voltage divider biased pre-amplifier using a 2N3904. My input signal level is 50mv p-p with a 50 ohm source resistance. I am looking for a gain of about 50. After doing the math and building the circuit, my design works, but in order to get a adequate quiescent point I have to use small valued resistors. As a result of this, I end up with a very low complex input impedance when I connect my signal source. My question is what would be a better approach to the amplifier design?