[10] Question 1: Answer the True [T] or False [F] questions below by circling th

Question

[10] Question 1: Answer the True [T] or False [F] questions below by circling the correct answer I)T F 2-register synchronizer can eliminates metastability entirely. 2) T F For domino logic, the inserted inverter is to resolve the monotonicity issue in precharge phase 3) T F To minimize the parasitic capacitance, the size of the transistor must be decreased. 4) T F The larger beta ratio, the larger low noise margin (NMi) 5) T F Compared to carry ripple adder, carry look ahead adder provides faster speed while using less logic gates 6) T F To fix the hold time violation, a buffer can be inserted before D input of the DFF. 7) T F Dynamic latch/DFF is faster than static latch/DFF, because it depends on the charges on the capacitor 8) T F Fig. 1 shows correct equivalent circuits Fig. 1: Bubble pushing 9) T F Asymmetric gates favor one input over another. The simple rising RC delay in Fig.2 is R(2C+2C+2C+KC) 10) T F 2C iN 2C OUT 2C Fig. 2: INYV.

Explanation / Answer

1) True - 2 Register Synchronizer helps maintaining setup and hold time accuracy, delaying the signals at input, hence preventing metastability.

2) True - Inserted Inverter is introduced for the purpose of resolving monotonicity in precharge phase, idea behind domino logic.

(3) True - Parasitic Capacitance is directly proportional to transistor size parameters W, L

(4) False - Max Noise Margin occurs for matching beta ratio of NMOS and PMOS

(5) True - Carry look Ahead Adder doesn't depend/wait for the previous state outputs to propagate the output to the next stage as in Ripple Carry Adder.

(6) False - For fixing hold, data path should have minimum delay and clock path should have maximum delay. Inserting a buffer at the D input will increase the delay of data path and hence increase hold violation.

(7) True

(8) True - DeMorgan's Law: A' + B' = (AB)'

(9) True

(10) False - Rising Delay = Delay in the Pull Up Network + Delay in Output Node = RTotal * CTotal
= R * (2C + 2C + KC)

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