The objective is to design a variable gain, low noise, wideband optical front-end transimpedance amplifier. The design requirements are as follows:

• Amplifier supply voltage: ± 2.5 V
• Transimpedance gain: 1 kΩ, 10 kΩ, or 100 kΩ
• Photodiode capacitance: C_APD = 3.3 pF (additional estimated PCB capacitance = 0.7 pF)
• Target bandwidth: 130 MHz, 40 MHz, or 14 MHz