Title :
Variable supply-voltage scheme with 95%-efficiency DC-DC converter for MPEG-4 codec
Author :
Ichiba, Fuyuki ; Suzuki, Kojiro ; Mita, Shinji ; Kuroda, Tadahiro ; Furuyama, Tohru
Author_Institution :
Syst. ULSI Eng. Lab., Toshiba Corp., Kawasaki, Japan
Abstract :
A variable supply-voltage (VS) scheme with a high power-conversion-efficiency DC-DC converter is presented. A new pulse width modulation (PWM) circuit for the DC-DC converter is proposed to reduce both power consumption and chip area. The power conversion efficiency reaches up to 95%, and the area is less than half of the conventional design. The VS scheme contains critical path replica circuits of an MPEG-4 codec LSI, and its output voltage is controlled by monitoring delay time of the replica circuits. Consequently the VS scheme can automatically generate minimal internal supply voltage that meets the demand from the operation frequency of an MPEG-4 codec LSI. The advantages of this circuit are successfully demonstrated through fabrication of a test chip using a 0.3 /spl mu/m CMOS technology.
Keywords :
CMOS integrated circuits; DC-DC power convertors; PWM power convertors; delays; integrated circuit design; low-power electronics; power supply circuits; video codecs; 0.3 micron; 95 percent; CMOS technology; DC-DC converter; MPEG-4 codec; chip area; critical path replica circuits; delay time; minimal internal supply voltage; operation frequency; output voltage; power consumption; power-conversion-efficiency; pulse width modulation; variable supply-voltage scheme; CMOS technology; Circuit testing; Codecs; DC-DC power converters; Energy consumption; Large scale integration; MPEG 4 Standard; Pulse circuits; Pulse width modulation; Pulse width modulation converters;
Conference_Titel :
Low Power Electronics and Design, 1999. Proceedings. 1999 International Symposium on
Conference_Location :
San Diego, CA, USA
Print_ISBN :
1-58113-133-X
