The first priority for a photosensing application is to design good stability into the transimpedance amplifier circuit. The Texas Instruments developers of WEBENCH® designer tools have conscientiously provided photosensing designs with stable 60° phase margins, or an approximate 8.7% overshoot from a step-input signal.
WEBENCH Designer tools have powerful software algorithms and visual interfaces that deliver complete power, lighting, and sensing applications in seconds. This enables the user to make value-based comparisons at a system and supply-chain level before a design is committed. One tool among others embedded in the WEBENCH environment is the photodiode portion of Sensor Designer. This article is specifically about the WEBENCH Sensor Designer’s built-in photodiode circuit stability.