Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1986-04-03
1988-03-29
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307354, 307362, 328167, H03K 5153
Patent
active
047345969
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 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 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 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".
REFERENCES:
patent: 4308502 (1981-12-01), Brolin
patent: 4572965 (1986-02-01), Yamamura
V. A. Shadden, "Reference Feedback Circuit for Phase-Modulated Signal Demodulation", IBM Technical Disclosure Bulletin, vol. 17, No. 11, Apr. 1975, pp. 3319-3320.
Campbell David L.
Tembhekar Ravindra D.
Advanced Micro Devices , Inc.
King Patrick T.
Salomon Kenneth B.
Tortolano J. Vincent
Zazworsky John
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