[FAQ] Transimpedance Amplifier Calculator

The attached excel file includes various calculators designed to help compensate your transimpedance circuit. Below are descriptions of each calculator which can also be found within the tool:

• Calculator A1: Given the GBP, RF and CIN, the calculator returns the achievable closed-loop bandwidth for a Butterworth response and the value of feedback capacitance.
• Calculator A2: Given the desired closed-loop TIA bandwidth (f-3dB), RF and CIN, the calculator returns the minimum gain-bandwidth product (GBP) of the amplifier needed for the application as well as the value of feedback capacitance.
• Calculator B: Calculator to determine the Bandwidth and Feedback capacitance (CF) given any arbitrary value of Q
• Calculator C1: Converting Q to Phase-margin, Overshoot(%) and Peaking
• Calculator C2: Converting Phase-margin to Q, Overshoot(%) and Peaking
• Calculator C3: Converting Overshoot(%) to Phase-margin, Q, Overshoot and Peaking

Details on the concepts and equations used for these calculations can be found in the following reports:

• Transimpedance Considerations for High-Speed Amplifiers Application Report
• What You Need To Know About Transimpedance Amplifiers – Part 1
• What You Need To Know About Transimpedance Amplifiers – Part 2