I'm trying to build an electric field receiver to detect VLF waves so my bandwidth will essentially operate within the range of 1 kHz to 100 kHz. I will have a short whip antenna(1-2 m long) as my antenna and I am trying to figure out the design for the preamplifier.
I'm a beginner at this so I may be approaching this wrong so I wanted to get some feedback over my design. I don't have a detailed circuit diagram yet but as a rough concept, I'm thinking of using a differential JFET common drain(source follower) as the input stage(which will have high input impedance and low output impedance). This stage will have really low noise and low gain since this stage affects the noise figure of the whole amplifier the most.
Then, for the gain stage, I am thinking of using a differential BJT common base pair which will be DC-coupled. This stage will bring the most gain and again needs to be low noise as well.
For the output stage, I am thinking of using a voltage follower op-amp with a step-down transformer.(I am not sure of this stage. Maybe using an emitter follower is a better idea?)
If I can optimize this design, would it work pretty well for my case in terms of gain, noise and bandwidth? Also would this be a better design over a conventional JFET input op-amp/instrumentation amplifier?