TGA4861

The TGA4861 is a state of the art TIA with integrated AGC designed for coherent DP-QPSK receivers with baud rates up to 44.6Gbps. It features a very low total harmonic distortion which is not only crucial for DP-QPSK, but also enables higher-level QAM applications. In addition, the TGA4861 features two compensating circuits that allow it to handle large DC input currents as well as large offsets between these currents. This is, among others, important for colorless applications. The TGA4861 is manufactured in a reliable high-speed SiGe process that combines excellent performance together with cost-effectiveness. The TGA4861 complies with the OIF intradyne receiver MSA. The TGA4861 is a dual TIA and thus contains two TIA/AGC circuits on each die. In addition to the many features defined in the OIF MSA, the TGA4861, for example, also includes a versatile bandwidth tuning function.

Features:

Excellent linearity and low total harmonic distortion of <1% for Vout,se<350mVpp

Able to handle large DC input currents

Tunable frequency response of 8.5-13.5 GHz

Large dynamic range of 26dB typical

Manual gain or AGC mode selectable

Multiple amplifier stages to achieve high gain

Output shutdown function

Peak level detection

 Input signal strength indicator (optional)

Dual TIA die with +3.3 V single supply voltage

Compliant with OIF intradyne receiver MSA

SiGe technology with ƒT / ƒmax of 170 / 250 GHz