描述 Description

Qorvo's TGA4874 is a quad channel fully differential state of the art TIA with integrated AGC designed for coherent DP-QPSK receivers. 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 TGA4874 has compensating circuits that allow it to handle large DC input currents as well as large offsets between these currents. This is important for colorless applications. The TGA4874 is manufactured in a reliable highspeed SiGe process that combines excellent performance together with cost-effectiveness.

特性 Features

? Quad channel fully differential transimpedance amplifier
? TIA functions can be controlled digitally thru a Serial Peripheral Interface (SPI Mode) or directly (Analog Mode). The choice of SPI Mode or Analog Mode is user selectable.
? Excellent linearity and low total harmonic distortion
? Able to handle large DC input currents
? Adjustable bandwidth and amplitude frequency response
? Large dynamic range
? Manual gain control or AGC modes of operation
? Adjustable output voltage range in AGC mode
? Output shutdown function
? Monitor voltages for the following functions:
? Receive Signal Strength
? DC Voltage at each differential input
? Peak output voltage
? Automatic Gain Control

應(yīng)用 Application

? 100G DP-QPSK with baud rate of 128 Gb/s
? Coherent QAM modulated systems with baud rates of 200 Gb/s
? TIA with AGC for long-haul or metro optical receiver modules