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Transimpedance amps for 40G optical networks

Posted: 20 Apr 2012 ?? ?Print Version ?Bookmark and Share

Keywords:transimpedance amplifier? telecommunications? silicon germanium?

GigOptix Inc. has rolled out its dual channel linear transimpedance amplifier (TIA) designed for 40Gb/s DWDM coherent optical receivers. The GX3122B, leveraging previous TIA designs by GigOptix, consists of two balanced linear TIAs integrated on a single silicon germanium die, described the company.

The device amplifies weak signals received from photodiodes to drive the ADC and DSP in a coherent optical system. The GX3122B is designed to provide excellent signal fidelity by having less than five percent harmonic distortion (THD) over a large dynamic range and being able efficiently handle the high AC and DC currents seen in coherent receivers, stated GigOptix.

The GX3122B claims to be a highly integrated solution with dual channel TIAs to reduce system complexity and cost. It features increased differential gain of 5k? and increased linear gain over 30dB dynamic range.

Additionally, the device boasts automatic or manual gain control options, peak detection function, low power consumption and an input power monitor. The GX3122B is sampling now.

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