| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an enhanced technology for determining whether an analog signal is a logical 1 or a logical 0. <P>SOLUTION: A receiver converts an analog signal, derived from light pulses in a GPON fiber optic system, to digital electrical signals with no error. A photodetector and transimpedance amplifier (TIA) convert the light pulses to analog electrical signals. A reset signal generated by a media access controller (MAC) in the GPON system signifies the start of a new burst of data. The receiver has a switchable low-pass filter that establishes the threshold voltage for determining whether the analog signal is a logical 1 or a logical 0. At the very start of a new burst, the low-pass filter has a fast time constant to quickly establish the threshold voltage for the burst. At a later time during the burst, the low-pass filter is switched to have a slow time constant to create a relatively stable threshold voltage. <P>COPYRIGHT: (C)2009,JPO&INPIT |
