Title :
Embedded current amplifier compensation for large-capacitive-load low-power two-stage amplifier
Author :
Pengfei Liao ; Ping Luo ; Bo Zhang ; Zhaoji Li
Author_Institution :
State Key Lab. of Electron. Thin Films & Integrated Devices, Univ. of Electron. Sci. & Technol. of China, Chengdu, China
fDate :
Oct. 29 2012-Nov. 1 2012
Abstract :
An embedded current amplifier compensation (ECAC) for large-capacitive-load low-power two-stage amplifier is presented in this paper with detailed theoretical analysis. With the embedded current amplifier in the first stage, the non-dominant pole determined by the load capacitor is pushed to higher frequencies while the GBW reduction is avoided, hence the capacity of driving capacitive load is improved. The size of compensation capacitor is also reduced significantly to save the overall chip area. Furthermore, the system offset is minimized due to the good symmetry of the first stage. The proposed circuit is designed and simulated in 0.13μm standard CMOS process. Simulation results show that the ECAC amplifier, driving an 800pF capacitive load, achieves a GBW of 4.2MHz while dissipating 200μW power with a compensation capacitor of only 1.5pF.
Keywords :
CMOS analogue integrated circuits; amplifiers; capacitors; ECAC; GBW reduction; capacitance 1.5 pF; capacitance 800 pF; embedded current amplifier compensation; frequency 4.2 MHz; large-capacitive-load low-power two-stage amplifier; load capacitor; nondominant pole; power 200 muW; size 0.13 mum; standard CMOS process; Capacitors; Circuit stability; Simulation; Stability criteria; Topology; Transfer functions;
Conference_Titel :
Solid-State and Integrated Circuit Technology (ICSICT), 2012 IEEE 11th International Conference on
Conference_Location :
Xi´an
Print_ISBN :
978-1-4673-2474-8
DOI :
10.1109/ICSICT.2012.6467875
