National Chiao-Tung University

Department of Electronics Engineering & Institute of Electronics

On-Chip DC/DC Converter with Frequency Detector and Application for Reconfigurable Multiplier-Accumulator Unit Design

Student : Jen-Wei Yang

Advisor : Dr. Wei Hwang


In the modern digital IC system, the dynamic voltage scaling is the most efficient technology for low power design. In this thesis, we proposed a frequency controlled on chip DC/DC voltage down converter with a supply voltage of 1.2V for dynamic voltage scaling design. The output of the converter is adaptive to the operation frequency. We proposed a reference voltage generator. The maximum variation with temperature which range is from -40°C to 140°C is 5mV. We implement the variable reference voltage generator (VRVG) based on this reference voltage. In our VRVG design, we define the four system modes which are the high performance mode (system clock=220MHz) at Vdd=1.2V, normal mode (system clock=165MHz) at Vdd=1V, standby mode (system clock=110MHz) and idle mode (system clock=55MHz) at Vdd=0.6V. The VRVG is easy to implement to the different circuits by changing the output buffer. The configurable multiplier-accumulation unit is based on array multiplier. We can combine the VRVG and MAC for different performance requirement. The power saving is 28.91% at normal mode, 44.5% at standby mode and 53.47% at idle mode. All simulations are implemented in TSMC0.13-µm CMOS technology.