A CMOS Current Amplifier for Very Weak Current Operations

摘要

In this paper, a new current amplifier with a very simplernstructure is proposed. The most significant features ofrnthis circuit are as follows: (1) It can accept very weakrninput currents in a pA-nA range. (2) The mid-bandrncurrent gain is about 60 dB. (3) The gain-bandwidthrnproduct can reach as high as 300 MHz. (4) The powerrndissipation is around 0.5 mW. The new circuit has beenrnimplemented using a CMOS digital technology and hasrnbeen tested to validate the circuit specifications.