Title :
Capacitor-Multiplier Frequency Compensation for Low-Power Multistage Amplifiers
Author :
Yan, Zushu ; Shen, Liangguo ; Zhao, Yuanfu ; Yue, Suge
Author_Institution :
Beijing Microelectron. Technol. Inst., Beijing
Abstract :
A new frequency compensation scheme for multi-stage amplifier, named Capacitor-Multiplier Frequency Compensation (CMFC), is introduced. Increasing the capacitance with a current-mode multiplier in CMFC amplifier allows the circuit to occupy less silicon area and to drive large capacitive loads more effectively. Moreover, smaller physical capacitance results in higher gain-bandwidth product (GBW) and improved transient responses. Furthermore, the capacitor-multiplier stage (CMS) embedded in CMFC creates a left-half-plane (LHP) zero, which boosts the phase margin and enhances the stability of the amplifier. Implemented in a commercial 0.5-¿m CMOS technology and driving 500pF capacitive load, a three-stage CMFC amplifier achieves over 100dB gain, 3.45MHz GBW and 1.62V/¿S average slew rate, while only dissipating 200 ¿W under 2V supply.
Keywords :
CMOS integrated circuits; HF amplifiers; capacitors; circuit stability; compensation; frequency multipliers; low-power electronics; transient response; voltage multipliers; CMOS technology; capacitance 500 pF; capacitor- multiplier stage; capacitor-multiplier frequency compensation; current-mode multiplier; frequency 3.45 MHz; gain 100 dB; gain-bandwidth product; low-power multistage amplifiers; phase margin; size 0.5 mum; transient responses; voltage 2 V; CMOS technology; Capacitors; Circuits; Collision mitigation; Frequency; Microelectronics; Parasitic capacitance; Poles and zeros; Topology; Transconductance;
Conference_Titel :
Electronics, Circuits and Systems, 2007. ICECS 2007. 14th IEEE International Conference on
Conference_Location :
Marrakech
Print_ISBN :
978-1-4244-1377-5
Electronic_ISBN :
978-1-4244-1378-2
DOI :
10.1109/ICECS.2007.4511039
