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M02139-13 Datenblatt(PDF) 3 Page - M/A-COM Technology Solutions, Inc. |
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M02139-13 Datenblatt(HTML) 3 Page - M/A-COM Technology Solutions, Inc. |
3 / 18 page 02139-DSH-001-D Mindspeed Technologies ® 3 Mindspeed Proprietary and Confidential 1.0 Product Specification 1.1 Description of Key Specifications 1.1.1 Input Referred Noise In the design of a Transimpedance Amplifier, the primary goal is to minimize the input referred noise of the amplifier. This achieves the best S/N ratio for optimum bit error rate performance of the incoming optical data stream. The noise performance of a TIA is a key specification for meeting the stringent optical sensitivity requirement. In general, the input referred noise calculations for a TIA are identical to those in other conventional amplifiers. The input referred noise can be determined from several methods. Traditionally at Mindspeed, TIA noise is obtained from dividing the output RMS voltage noise of the TIA by the transimpedance. The small signal transimpedance of the TIA can be calculated by applying a known p-p input current and then measuring the p-p differential output voltage. The equations used for IN (Input Referred Noise) and GTIA (Transimpedance) are shown below. The TIA output RMS noise can be measured conveniently by using a wide band oscilloscope (or by using a power meter and converting the noise power to noise voltage). IN = (VoutRMS / GTIA) GTIA = (VoutPP/ I_inputPP), where: IN = Input referred noise in RMS GTIA = TIA small signal transimpedance I_inputPP= p-p input current 1.1.2 Optical Input Sensitivity TIA input sensitivity can be calculated from the optical sensitivity equation directly based on the input referred noise, photodiode responsivity and transmitter extinction ratio information. Note that the Signal to Noise (S/N) must exceed 14.1 to achieve a system bit error rate (BER) of 1x10 -12. Sensitivity = 10log {((S/N x IN x (ER + 1)) / (2 x ρ x (ER – 1))) x 1000} dBm Where: Sensitivity = Input sensitivity expressed in average power S/N = 14.1(for 10 -12 BER) IN = Input Referred Noise in RMS ER = Extinction Ratio = 10 (typically) ρ = Photodiode Responsivity = 0.9 (typically) |
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