On-chip compensated error amplifier for voltage-mode buck converters

An on-chip compensated error amplifier in a voltage-mode buck converter is proposed in the paper. The compensated error amplifier is composed of two blocks, unit gain zero generation block and gain block, realizing phase shift and gain of the feedback loop, respectively. Compared to conventional type III compensated error amplifier in voltage-mode buck converter, the proposed circuit has much smaller passive component values, enabling full integration of the voltage mode buck converter in SoC. The converter is designed in 0.13µm CMOS process, operating typically at 1.5 MHz pulse width modulation (PWM). The simulation results show the converter with on-chip compensated error amplifier achieves both 0.3% load regulation and 10µs load step response time for load step between 200mA and 700mA.

[1]  Christian Kranz,et al.  Evolution on SoC Integration : GSM Baseband-Radio in 0.13 μm CMOS Extended by Fully Integrated Power Management Unit , 2008, ISSCC 2008.

[2]  J. Kissing,et al.  Single Chip Cellular Radios for GSM, GPRS, EDGE , 2007, 2007 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium.

[3]  J. Kissing,et al.  Evolution on SoC Integration: GSM Baseband-Radio in 0.13 $\mu{\hbox {m}}$ CMOS Extended by Fully Integrated Power Management Unit , 2008, IEEE Journal of Solid-State Circuits.

[4]  Xing Zhang,et al.  Design of Low-Voltage Low-Dropout Regulator with Wide-Band High-PSR Characteristic , 2006, 2006 8th International Conference on Solid-State and Integrated Circuit Technology Proceedings.

[5]  Robert W. Erickson,et al.  Fundamentals of Power Electronics , 2001 .

[6]  Mei-Ling Yeh,et al.  A High Efficiency Dual-Mode Buck Converter IC For Portable Applications , 2008, IEEE Transactions on Power Electronics.

[7]  Ke-Horng Chen,et al.  Fast-Transient DC–DC Converter With On-Chip Compensated Error Amplifier , 2006, IEEE Transactions on Circuits and Systems II: Express Briefs.

[8]  Xing Zhang,et al.  Design of High-Performance Voltage Regulators Based on Frequency-Dependent Feedback Factor , 2007, 2007 IEEE International Symposium on Circuits and Systems.

[9]  R.B. Staszewski,et al.  The First Fully Integrated Quad-Band GSM/GPRS Receiver in a 90-nm Digital CMOS Process , 2006, IEEE Journal of Solid-State Circuits.