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

fYear

2007

fDate

11-14 Dec. 2007

Firstpage

502

Lastpage

505

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-Â¿m CMOS technology and driving 500pF capacitive load, a three-stage CMFC amplifier achieves over 100dB gain, 3.45MHz GBW and 1.62V/Â¿S average slew rate, while only dissipating 200 Â¿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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICECS.2007.4511039

Filename

4511039