Indirect compensation technique based two-stage recycling folded cascode amplifier for reconfigurable multi-mode sigma-delta ADC

Author

Fahmy, Ghazal A. ; Pokharel, R.K. ; Kanaya, H. ; Yoshida, K.

Author_Institution

Grad. Sch. of Inf. Sci. & Electr. Eng., Kyushu Univ., Fukuoka, Japan

fYear

2010

fDate

15-17 Dec. 2010

Firstpage

1

Lastpage

4

Abstract

Typical and proposed recycling folded cascade (RFC) amplifier have been designed in TSMC 0.18 μm. Simulated and measured results are compared. Proposed RFC demonstrate an enhancement on DC gain by 5 dB almost for the same power consumption and bandwidth. Moreover, it realized less input referred noise than typical. Split-length devices (SLD) method is applied on proposed (RFC) to create a low impedance node employed in indirect feedback compensation. Realization of two-stages recycling folded cascade amplifier using indirect feedback compensation method has been designed. The proposed two-stages amplifier delivers open loop gain 83 dB enhanced by 20 dB over typical one, gain bandwidth product is 187 MHz and slew rate is 74 V/μs which is required for reconfigurable multi-mode sigma-delta ADC to attain high SNR and SNDR.

Keywords

bandwidth allocation; circuit feedback; compensation; low-power electronics; operational amplifiers; sigma-delta modulation; DC gain; RFC amplifier; SLD method; SNDR; SNR; TSMC; bandwidth; indirect compensation technique; indirect feedback compensation; input referred noise; low impedance node; open loop gain; power consumption; reconfigurable multimode sigma-delta ADC; split-length devices method; two-stage recycling folded cascode amplifier; Bandwidth; Impedance; Integrated circuit modeling; MOS devices; Noise; Recycling; Superluminescent diodes; Folded cascode amplifier; Indirect compensation; split-length device;

fLanguage

English

Publisher

ieee

Conference_Titel

Electron Devices and Solid-State Circuits (EDSSC), 2010 IEEE International Conference of

Conference_Location

Hong Kong

Print_ISBN

978-1-4244-9997-7

Type

conf

DOI

10.1109/EDSSC.2010.5713690

Filename

5713690