POS K Map
Duration: 3 min
This video lesson is available to enrolled students.
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This educational video features Sanchit Jain Sir explaining the construction of a Karnaugh Map (K-Map) for Product of Sums (POS). The lecture begins with the instructor drawing a 4x4 grid. He labels the top axis with a and b and the left axis with c and d. He populates the header cells with Gray code sequences, writing 0+0, 0+1, 1+1, 1+0 for columns and rows. Above the columns, he writes sum terms: a+b, a+b', a'+b', a'+b. Next to the rows, he writes c+d, c+d', c'+d', c'+d. He explains that for POS, the focus is on maxterms. He proceeds to fill the interior cells with decimal numbers representing maxterms, starting with 0, 4, 12, 8 in the first row.
Chapters
0:00 – 2:00 00:00-02:00
The instructor introduces K-Map for POS and sets up a 4x4 grid. He labels top row headers with a+b and left column headers with c+d. He fills top row cells with binary values 0+0, 0+1, 1+1, 1+0 and left column cells similarly. He writes boolean expressions above columns: a+b, a+b', a'+b', a'+b. He also writes expressions next to rows: c+d, c+d', c'+d', c'+d. He begins filling grid cells with decimal numbers, writing 0, 4, 12, 8 in the first row to represent maxterms. He ensures the headers follow the Gray code sequence to maintain adjacency properties.
2:00 – 2:59 02:00-02:59
The instructor continues filling the K-Map grid with decimal maxterm values. He writes 1, 5, 13, 9 in the second row, 3, 7, 15, 11 in the third row, and 2, 6, 14, 10 in the fourth row. On the right side, he writes a sample boolean expression a' + b + c + d' and evaluates it as 1 + 0 + 0 + 1. He explains the process of mapping these maxterms to the grid, emphasizing the specific order of filling cells to ensure correct Gray code adjacency. This visual aid helps students understand how to convert Boolean expressions into K-Map format.
The video provides a step-by-step tutorial on creating a 4-variable K-Map for Product of Sums (POS) logic. The instructor systematically labels axes with variables a, b, c, and d, using Gray code sequences for headers. He demonstrates populating the map with decimal maxterm values (0 through 15) in the correct order. Additionally, he illustrates evaluating a specific maxterm expression, showing how binary inputs correspond to logic values within the POS framework. This lesson prepares students for simplifying complex Boolean expressions using K-Maps.