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chapter7_ex - chapter7-ex.fm Page 1 Wednesday 11:52 PM 1...

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1 Chapter 7 Problem Set Chapter 7 PROBLEMS 1. [M, None, 7.4] Figure 1 shows a practical implementation of a pulse register. Clock Clk is ideal with 50% duty cycle. Data : V DD = 2.5V, t p,inv = 200ps, node capacitances are C Clkd = 10fF, C x = 10fF, both true and complementary outputs node capacitances are 20fF. a. Draw the waveforms at nodes Clk , Clkd , X and Q for two clock cycles, with D = 0 in one cycle and D = 1 in the other. b. What is the approximate value of setup and hold times for this circuit? c. c)If the probability that D will change its logic value in one clock cycle is α , with equal probability of being 0 or 1, what is the power consumption of this circuit? (exclude the power consumption in the clock line) f clk = 100 MHz. V DD X Clk D Clkd Q Q Figure 0.1 Pulse register. chapter7-ex.fm Page 1 Wednesday, October 29, 2003 11:52 PM
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2 Chapter 7 Problem Set 2. [M, None, 7.4] Figure 2 shows a register that attempts to statistically reduce power consump- tion using a data-transition look-ahead technique. a. Briefly describe the operation of the circuit. b. If all the NMOS transistors are of the same size, and all of the PMOS transistors are of the same size, two times wider than the NMOS, roughly determine the input switching proba-
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