8 GHz Gain Bandwidth Product, Decompensated Transimpedance Amplifier with Bipolar Input

The OPA855 is a wideband,

low-noise operational amplifier with

bipolar inputs for wideband transimpedance and voltage amplifier applications. When

the device is configured as a transimpedance amplifier (TIA), the 8GHz gain bandwidth product (GBWP) enables high

closed-loop bandwidths at transimpedance

gains of up to tens of kilohms.

The following graph shows the bandwidth and noise

performance of the OPA855 as a function of

the photodiode capacitance when the amplifier is configured

as a TIA. The total noise is calculated along a bandwidth

range extending from dc to the calculated frequency

(f) on the left scale. The OPA855 package has a feedback pin

(FB) that simplifies the feedback network connection between

the input and the output.

The OPA855 is optimized to

operate in optical time-of-flight (ToF) systems where the OPA855 is used

with time-to-digital converters, such as the TDC7201. Use the OPA855 to drive a high-speed analog-to-digital converter (ADC) in

high-resolution LIDAR systems with a differential output amplifier, such as the THS4541 or LMH5401 devices.