This book covers various design problems related to the VLSI modulation circuits and their applications in the areas of signal processing, data conversion, and power management. It provides a good reference for learning through problem solving of PWM modulation, sigma-delta modulation, and special VLSI circuit techniques, such as class-D amplifier circuits, lock-in amplifier circuits, switched-capacitor charge pump circuits, DC/DC converter circuits, chopper circuits, mixer circuit, and fractional-N PLL circuits.