Consider INV1 driving INV2. The falling delay tpdf of INV1 increased b

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Consider INV1 driving INV2. The falling delay tpdf of INV1 increased by 50% after making the PMOS and NMOS of INV2 three times larger than the original value (PMOS: 6 → 18 and NMOS: 2 → 6). Find the unit(s) of the NMOS for INV1. Use the RC delay model.

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Consider $I N V_{1}$ driving $I N V_{2}$ . The falling delay $t_{pdf}$ of $I N V_{1}$ increased by $50 %$ after making the PMOS and NMOS of ${I N V}_{2}$ three times larger than the original value (PMOS: $6 \to 18$ and NMOS: $2 \to 6$ ). Find the unit(s) of the NMOS for ${I N V}_{1}$ . Use the RC delay model.