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INTRODUCTION TO IMS METHOD FOR THE

THRESHOLD REALIZATION

Implied Minterm Structure (IMS) method

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IMS method• Write down the minterms

• These should be positive and ordered , ri>=N(1)/N(0) , this ratio in each column should be r1>=r2>=r3>=r4>=r5>=1

• Write it down in the IMS chart

• Select Nested F’s

• Realize each zone by Dertouzo’s method

• Connect with the help of OR gate(I/p +1,-1)

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Final Realization

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Finding weights and Threshold for F1:

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Finding weights and Threshold for F2:

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Finding weights and Threshold for F3:

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Finding weights and Threshold for F4:

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Example: (Modifying the function)

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Example:

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Final realization

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Example:

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Threshold Gate Realization

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Similarly,

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Realization of theDifference

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Realization of Borrow

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Complete realization of an Arithmetic Cell