Title :
Optimum nested Miller compensation for low-voltage low-power CMOS amplifier design
Author :
Leung, Ka Nang ; Mok, Philip K T ; Ki, Wing Hung
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong
Abstract :
An optimum structure of nested Miller compensation (NMC) is developed. The developed structure using a feedforward transconductance stage and null resistor on NMC, called NMCFNR, solves the bandwidth reduction and poor transient response problems of low-voltage low-power NMC amplifiers. For comparison, amplifiers compensated by NMC and NMCFNR have been fabricated. Experimental results show that NMCFNR improves the gain-bandwidth product, slew rate and settling time by more than three times with 8° increase on the phase margin and no increase of the power consumption. Moreover, it improves the negative power supply rejection ratio by at least 54 dB. The die area of the NMCFNR amplifier is about half of that of the NMC amplifier
Keywords :
CMOS analogue integrated circuits; circuit stability; compensation; differential amplifiers; feedforward; integrated circuit design; linear network synthesis; low-power electronics; operational amplifiers; stability criteria; transfer functions; transient response; LV amplifier design; feedforward transconductance stage; frequency compensation; gain-bandwidth product; low-power CMOS amplifier design; low-voltage CMOS amplifier design; negative power supply rejection ratio; optimum nested Miller compensation; resistor; settling time; slew rate; transient response; Bandwidth; Capacitors; Circuit topology; Feedforward systems; Frequency; Power supplies; Resistors; Stability criteria; Transconductance; Voltage;
Conference_Titel :
Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-5471-0
DOI :
10.1109/ISCAS.1999.780838
