Title :
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
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;
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
DOI :
10.1109/EDSSC.2010.5713690
