h1. Lab Journal

h2. 20 Oct, 2012 - Tunnelling Current Amplifier simulation

The tunnelling current amplifier is an example of a _transimpedance_ amplifier: it converts a current input into a voltage output. This amplifier is a critical circuit in the microscope, so I have taken advantage of available electronic simulation software to test and tune the design before committing to a PCB.

h3. Bandwidth vs noise

In a transimpedance amplifier there is an unavoidable tradeoff between the bandwidth of the amplifier response and its output noise.