I am working on a project about a wavemeter. the wavemeter have 16 photodiodes. I want to design a transimpedance amplifer that I will interface with an ADC that I will later select.
- My problem is selecting a transimpedance amplifier with a speed of 100MHz at 10ns with low noise. this is because the photodiode are working in the photovoltaic mode which is a problem at high frequencies. With a high signal to noise ratio. My question are: its possible to have transimpedance amplifier that can perform this task. Do I need a two stages. design one for the transimpedance amplifier and the other for the additional gain .
the photodiode current is 0.04mA and capacitance is 100pF
- the ADC will be 12 bits with a sample rate of 100MHz