The OPA657 device combines a high gain-bandwidth, low-distortion, voltage-feedback operational amplifier with a low voltage noise JFET-input stage to offer a very high dynamic range amplifier for high-precision analog-to-digital converter (ADC) driving or wideband transimpedance applications. Photodiode applications achieve improved noise and bandwidth using this decompensated, high gain-bandwidth amplifier. Very low level signals can be significantly amplified in a single OPA657 gain stage with exceptional bandwidth and accuracy. The very low input bias current and capacitance supports this performance even for relatively high source impedance. Broadband photodetector applications benefit from the low voltage noise JFET inputs for the OPA657. The JFET input contributes virtually no current noise, which makes the device ideal for high-gain photodiode applications.