26 THE CLOCK BUFFER FROM EXERCISE 25 IS AN EXAMPLE OF A 1-2 FORK....

4.26 The clock buffer from Exercise 4.25 is an example of a 1-2 fork. In general, if a 1–2

fork has a maximum input capacitance of C

and each of the two legs drives a load of

C

, what should the capacitance of each inverter be and how fast will the circuit

operate? Express your answer in terms of p

.

Let the sizes be x and y in the 2-stage path and C

- x in the 1-stage path.

= + = +

D p p

2

2 C

2

−

C x

*** doesn’t seem to have any closed-form solution