| Summary: | 碩士 === 國立臺北科技大學 === 電子工程系研究所 === 104 === In first part of this thesis, the voltage-to-duty cycle modulator uses rail-to-rail current source to control the duty cycle. This voltage-to-duty cycle modulator can achieve much higher switching frequency than traditional pulse width modulation with ramp generator and comparator. The hysteresis comparator in the ramp generator will result in delay bug when working in high switching frequency(up to 100MHz). The total chip area is 0.565 x 0.646 mm2 with PADs, the supply voltage is 1.8V, and the duty cycle is 0.1 to 0.95.
The second part of this thesis presents a buck convertor with the rail-to-rail current controlled voltage-to-duty cycle modulator and the Bondwire Inductor. If the modulator can overcome the delay bug, it can work in 250MHz, which bring fast transient response. When the load current is changed from light load to heavy load, 20mA to 150mA, and from heavy load to light load, 150mA to 20mA, the transient response time is 1.8us and 2.5us, respectively. The input voltage is 1.8 V and the output voltage range is from 0.7 V to 1.4 V. The total chip area is 0.634 x 0.885 mm2 with PADs.
The third part of this thesis presents a buck convertor with simple current source controlled voltage-to-duty-cycle modulator and Bondwire inductor, and the buck converter works in 150MHz. The input voltage is 1.8V and the output voltage range is from 0.4V to 1.4V. When the load current is changed from light load to heavy load, 20mA to 120mA, and from heavy load to light load, 120mA to 20mA, the transient response time is 1.5us and 2us The total chip area is 0.868 x 0.736 mm2 with PADs.
|
|---|
