Current amplifier

Hi! i would like to know how to design a current amplifier with the following requirements:

bandwidth: 1 MHz
gain: 1000
low input impedance
high output impedance
input voltage without signal 0V
minimum input current signal 1 pA
maximum input current signal 100 nA

using bjt, mosfet, resistances and capacitors.
Thank you!

i think you have done mistake in writing impedances.input should be very high and output should be very low to avoid loading effect.
taking your gain into account you should go for the darlington pair amplifier. even you would get a good bandwidth with it.

dj_devil said:

i think you have done mistake in writing impedances.input should be very high and output should be very low to avoid loading effect...

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No, that would describe a voltage amplifier. An ideal current amplifier presents a short to its source, and has and infinite output impedance.

Those characteristics are very difficult to meet without an op amp in the loop.

Are op amps allowed?