8.2.1.2.2 OPA2356-EP Design Procedure

To achieve a maximally-flat, second-order Butterworth frequency response, the feedback pole must be set to:

Equation 1.

Use Equation 2 to calculate the bandwidth.

Equation 2.

For single-supply applications, the +INx input can be biased with a positive DC voltage to allow the output to reach true zero when the photodiode is not exposed to any light, and respond without the added delay that results from coming out of the negative rail; this configuration is shown in Figure 31. This bias voltage appears across the photodiode, providing a reverse bias for faster operation.

Figure 31. Single-Supply Transimpedance Amplifier

For additional information, see the Compensate transimpedance amplifiers intuitively application report.