A sub-sampling 4.25GS/s 3-bit flash ADC with asymmetric spatial filter response

Author

Yi, Zhao ; Shenjie, Wang ; Zhiliang, Hong ; Zaichen, Zhang

Author_Institution

State Key Lab. of ASIC & Syst., Fudan Univ., Shanghai, China

fYear

2011

fDate

Nov. 30 2011-Dec. 2 2011

Firstpage

57

Lastpage

60

Abstract

A sub-sampling 3-bit 4.25GS/s flash ADC with a novel averaging termination technique - asymmetric spatial filter response - in 0.13μm CMOS for impulse radio ultra-wideband (IR-UWB) receiver is presented. In this design, a track and hold (T/H) circuit with self-biased buffer is used to compensate the degradation in amplitude when frequency increases to giga Hz. Averaging termination technique using asymmetric spatial filter response is proposed to relieve the termination offset of the flash ADC. The measurement results reveal that the SFDR and SNDR of the ADC are 26.3dB and 18.4dB, respectively, even the input signal frequency is 4.2GHz. INL and DNL are measured improved to 0.11LSB and 0.18LSB, respectively, when asymmetric spatial filter is used. The power of ADC is 63mW and the active area is 0.49×0.72 mm². The ADC achieves a figure of merit (FoM) of 2.2pJ/conversion-step.

Keywords

CMOS integrated circuits; analogue-digital conversion; field effect MMIC; microwave filters; radio receivers; sample and hold circuits; spatial filters; ultra wideband technology; CMOS process; IR-UWB receiver; asymmetric spatial filter response; averaging termination technique; figure of merit; frequency 4.2 GHz; impulse radio ultra-wideband receiver; input signal frequency; power 63 mW; self-biased buffer; size 0.13 mum; subsampling flash ADC; track and hold circuit design; word length 3 bit; CMOS integrated circuits; Interpolation; Laboratories; Latches; Preamplifiers; Receivers; Spatial filters; Flash ADC; IR-UWB; asymmetric spatial filter; encoder; sub-sampling; track and hold;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio-Frequency Integration Technology (RFIT), 2011 IEEE International Symposium on

Conference_Location

Beijing

Print_ISBN

978-1-4577-0517-5

Type

conf

DOI

10.1109/RFIT.2011.6141800

Filename

6141800