Transimpedance Amplifiers

Three transimpedance amplifiers for use in optical receiver front-ends include the GD19531 and the GD19532 for 2.5 Gbit/s, and the GD19906 for 10 Gbit/s. The GD19531 and the GD19532 fully comply to the ITU-T STM-16 specifications, as well as the SONET OC-48 specifications. The GD19906 fully complies to the 10 Gbit/s ITU-T STM-64 specifications, as well as the SONET OC-192 specifications.

The GD19532 is a 3.3 V device, while the GD19531 is a 5 V device. Both 2.5 Gbit/s amplifiers have a built-in limiting function, whose high output voltage eliminates the need for an external limiting amplifier in typical applications. The GD19531 and the GD19532 offer a transimpedance of typically 26 kohm over a 3 dB bandwidth of at least 1600 MHz. The input sensitivity measured at BER = 10⁹ is better than -23.5 dBm. Both devices can be delivered in a standard SSOP-16 plastic package for PCB mounting or alternatively as die for integration with a PIN or APD photodiode.

The GD19906 10 Gbit/s transimpedance amplifier is intended for use in conjunction with a PIN or APD photo-detector to convert and amplify an optical STM-64/OC-192 NRZ signal into an electrical signal for further processing by other elements of a reception system. The GD19906 can be used as a building block in conjunction with other company products, such as the GD19902 AGC Amplifier and the GD16544 DeMUX -- creating a full 10 Gbit/s receiver front-end.
The GD19906 can be operated from a single +8 V power supply with a power dissipation of only 750 mW and an input equivalent noise of only 12 pA / root Hz. It offers a transimpedance of typically 500 ohm over a 3 dB bandwidth of at least 10 GHz. The input sensitivity measured at BER = 10⁹ is better than -18 dBm. The device is delivered as a 1.1 x 0.95 mm die.

GIGA North America, 299 W.Hillcrest Drive, Suite 206, Thousand Oaks, CA 91360 Phone: 805-496-7181 Fax: 805-496-7507