Title:
【発明の名称】交流成分をも有するシングルエンドの信号ラインで予め定められた電圧を超過する直流成分の検出のための方法
Document Type and Number:
Japanese Patent JP2607879
Kind Code:
B2
Abstract:
Method and apparatus suitable for inclusion in an integrated circuit transceiver meeting IEEE 802.3 standards which detects "collisions" so that more than one station will not simultaneously transmit over a network. The method employs a novel three-pole cyclical low-pass filter (20) which attenuates the ac component received over the network to less than 20 mV to allow collision detection within the 900 nanosecond budget allowed by the IEEE standard. A differential operational amplifier (18) receives the signal from the network and a collision reference voltage. The signal generated by the differential amplifier is filtered by the low-pass filter and then coupled to a high-gain comparator (22) which acts as a zero-crossing detector. The comparator generates ECL logic signals representing the occurrence or non-occurrence of a collision. The resulting collision detector operates over a wide range without the need for field "trimming".
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Inventors:
Ravindra Dee Thebuheker
David El Campbell
David El Campbell
Application Number:
JP8219287A
Publication Date:
May 07, 1997
Filing Date:
April 01, 1987
Export Citation:
Assignee:
Advanced Micro Devices Inco-Pole-Ted
International Classes:
H04L12/413; (IPC1-7): H04L12/28
Domestic Patent References:
| JP59135921A |
Other References:
【文献】米国特許4412347(US,A)
【文献】欧州特許公開115632(EP,A)
【文献】欧州特許公開115632(EP,A)
Attorney, Agent or Firm:
Fukami Hisaro (2 outside)