Burst mode digital optical receiver

专利名称：Burst mode digital optical receiver发明人：Yusuke Ota申请号：US09/156717申请日：19980918公开号：US06055279A公开日：20000425

摘要：A DC coupled burst mode optical receiver circuit having improved sensitivity andimproved dynamic range. The output of the receiver's photodiode is single endedlyamplified by a main preamplifier and the main preamplifier's output is then converted,using an operational amplifier, e.g., with a gain of 1, to a differential signal which swingssymmetrically around a threshold level. More specifically, the output of the mainpreamplifier is connected to one input of the operational amplifier. The output of atracking preamplifier, which is identical to the main preamplifier, is coupled to the otherinput of the operational amplifier. The output of the tracking preamplifier is used tomatch the DC voltage of the main preamplifier, e.g., by being noise-free and by trackingchanges in supply voltage, temperature, and the like. It is used to set the DC referencevoltage for the standard operational amplifier functions. Between one output of theoperational amplifier and the opposite sign input thereof is connected an automaticthreshold controller (ATC). The ATC insures that the threshold level for determining thevalue of the logic value of the received signal is at the middle of the signal supplied fromthe main preamplifier. Preferably, the main preamplifier, the tracking preamplifier, theoperational amplifier and the ATC are manufactured on a single integrated circuit.Optionally, a transimpedance resistor of both the main preamplifier and the tracking

preamplifier are clamped to a predetermined maximum level, e.g., using a high-speedSchottkey diode, to enhance the dynamic range of the receiver.

申请人：LUCENT TECHNOLOGIES INC.

代理人：Eugene J. Rosenthal

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