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Eliminating Radiated Sources for Emissions for Microprocessors With Multiplexed Signals

IP.com Disclosure Number: IPCOM000035139D
Original Publication Date: 1989-Jun-01
Included in the Prior Art Database: 2005-Jan-28

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Hardin, KB [+details]


When an electronic module buffers or latches the address/data bus of an Intel 8088, 80188, 8086, or 80186 microprocessor, the output produced by the buffer or latch creates radiated emissions on the output address or data bus resulting from the microprocessor having invalid periods between the address and the following data cycle or between the data cycle and the following address of the next cycle. These invalid periods typically involve one or more changes of state. The consequent radiation is avoided by delaying when the addresses are changed and when the data is transmitted until the information is guaranteed valid.